Ellen Susanna Howell

Research Professor, Lunar and Planetary Laboratory
Member of the Graduate Faculty

Contact

(520) 626-2880
Gerard P. Kuiper Space Sci., Rm. 218
Tucson, AZ 85721
ehowell@arizona.edu

Degrees

Ph.D. Planetary Sciences

University of Arizona, Tucson, Arizona, United States
Probing Asteroid Composition using Visible and Near-Infrared Spectroscopy

Awards

Asteroid 2735 Ellen

IAU, Fall 2015

Interests

No activities entered.

Courses

2024-25 Courses

Dissertation

PTYS 920 (Spring 2025)
Dissertation

PTYS 920 (Fall 2024)

2023-24 Courses

Dissertation

PTYS 920 (Spring 2024)
Dissertation

PTYS 920 (Fall 2023)

2022-23 Courses

Research

PTYS 900 (Spring 2023)
Independent Study

PTYS 599 (Fall 2022)
Research

PTYS 900 (Fall 2022)

2021-22 Courses

Independent Study

PTYS 599 (Spring 2022)

Scholarly Contributions

Journals/Publications

Deleon, A. P., Marshall, S. E., Becker, T. M., Pravec, P., Howell, E. S., Nolan, M. C., Virkki, A. K., Rivera-Valent{\'\in}, E. G., Taylor, P. A., Bolin, B. T., Aponte-Hern{\'andez}, B., Cabrera, I., Ku{\v{s}nir\'ak}, P., Hornoch, K., & Ku{\v{c}\'akov\'a}, H. (2024). Physical and Mutual Orbit Characteristics of Near-Earth Binary Asteroid (163693) Atira. \psj, 5(10), 235.
Myers, S. A., Howell, E. S., Magri, C., Vervack, R. J., Fern{\'andez}, Y. R., Hinkle, M. L., & Marshall, S. E. (2024). Inconsistencies in Simple Thermal Model Results for Near-Earth Asteroids between Infrared Telescope Facility SpeX and NEOWISE Data. \psj, 5(10), 238.
Rivera-Valent{\'\in}, E. G., Aponte-Hern{\'andez}, B., Taylor, P. A., Nolan, M. C., Howell, E. S., Waller, D., Zambrano-Mar{\'\in}, L. F., Virkki, A. K., Ballouz, R., & Stickle, A. M. (2024). Radar Circular Polarization Ratio of Near-Earth Asteroids: Links to Spectral Taxonomy and Surface Processes. \psj, 5(10), 232.
Zambrano-Marin, L. F., Howell, E. S., Marshall, S. E., Giorgini, J., & Venditti, F. C. (2024). The Fastest Rotators: Near-Earth Asteroids Observed with the Arecibo Planetary Radar System. \icarus, 415, 116060.
Clark, B., Sen, A., Zou, X. -., DellaGiustina, D., Sugita, S., Sakatani, N., Thompson, M., Trang, D., Tatsumi, E., Barucci, M., Barker, M., Campins, H., Morota, T., Lantz, C., Hendrix, A., Vilas, F., Keller, L., Hamilton, V., Kitazato, K., , Sasaki, S., et al. (2023). Overview of the search for signs of space weathering on the low-albedo asteroid (101955) Bennu. \icarus, 400, 115563.
Myers, S. A., Howell, E. S., Magri, C., Vervack, R. J., Fern{\'andez}, Y. R., Marshall, S. E., & Taylor, P. A. (2023). Constraining the Limitations of NEATM-like Models: A Case Study with Near-Earth Asteroid (285263) 1998 QE2. \psj, 4(1), 5.
Rivkin, A. S., Thomas, C. A., Wong, I., Rozitis, B., Le{\'on}, J., Holler, B., Milam, S. N., Howell, E. S., Hammel, H. B., Arredondo, A., Brucato, J. R., Epifani, E. M., Ieva, S., La, F. F., Lucas, M. P., Lucchetti, A., Pajola, M., Poggiali, G., Sunshine, J. N., & Trigo-Rodr{\'\iguez}, J. M. (2023). Near to Mid-infrared Spectroscopy of (65803) Didymos as Observed by JWST: Characterization Observations Supporting the Double Asteroid Redirection Test. \psj, 4(11), 214.
Lejoly, C., Harris, W., Samarasinha, N., Mueller, B., Howell, E., Bodnarik, J., Springmann, A., Kareta, T., Sharkey, B., Noonan, J., Bedin, L., Bosch, J. -., Brosio, A., Bryssinck, E., Vanssay, J. -., Hambsch, F. -., Ivanova, O., Krushinsky, V., Lin, Z. -., , Manzini, F., et al. (2022). Radial Distribution of the Dust Comae of Comets 45P/Honda-Mrkos-Pajdus??\'akov\'a and 46P/Wirtanen. \psj, 3(1), 17.
Prabhu, D. S., Margot, J., Howell, E. S., Presler-Marshall, B., McGlasson, R. A., Repp, D., L{\'opez-Oquendo}, A., Jim{\'enez}, F., Bagu{\'e}, A., Lebr{\'on}, J., Marrero, J., Negr{\'on}, V., Padilla, D., Gonz{\'alez}, E., Cabrera, I., Perillat, P., Nolan, M. C., Rodriguez, S. C., Aponte, H. B., , Bhiravarasu, S. S., et al. (2022). Arecibo Planetary Radar Observations of Near-Earth Asteroids: 2017 December-2019 December. Planetary Science Journal, 3(9), 222.
DellaGiustina, D., Kaplan, H., Simon, A., Bottke, W., Avdellidou, C., Delbo, M., Ballouz, R. -., Golish, D., Walsh, K., Popescu, M., Campins, H., Barucci, M., Poggiali, G., Daly, R., Le Corre, L., Hamilton, V., Porter, N., Jawin, E., McCoy, T., , Connolly, H., et al. (2021). Exogenic basalt on asteroid (101955) Bennu. Nature Astronomy, 5, 31-38.
Praet, A., Barucci, M., Clark, B., Kaplan, H., Simon, A., Hamilton, V., Emery, J., Howell, E., Lim, L., Zou, X. -., Li, J. -., Reuter, D., Merlin, F., Deshapriya, J., Fornasier, S., Hasselmann, P., Poggiali, G., Ferrone, S., Brucato, J., , Takir, D., et al. (2021). Hydrogen abundance estimation and distribution on (101955) Bennu. \icarus, 363, 114427.
Zegmott, T. J., Lowry, S., Ro{\.zek}, A., Rozitis, B., Nolan, M., Howell, E., Green, S., Snodgrass, C., Fitzsimmons, A., & Weissman, P. (2021). Detection of the YORP effect on the contact binary (68346) 2001 KZ66 from combined radar and optical observations. \mnras, 507(4), 4914-4932.
Zegmott, T., Lowry, S., Rozek, A., Rozitis, B., Nolan, M., Howell, E., Green, S., Snodgrass, C., Fitzsimmons, A., & Weissman, P. (2021). VizieR Online Data Catalog: Contact-binary (68346) 2001 KZ66 light curves (Zegmott+, 2021). VizieR Online Data Catalog, J/MNRAS/507/4914.
Ackley, K., Adya, V., Agrawal, P., Altin, P., Ashton, G., Bailes, M., Baltinas, E., Barbuio, A., Beniwal, D., Blair, C., Blair, D., Bolingbroke, G., Bossilkov, V., Shachar Boublil, S., Brown, D., Burridge, B., Calderon Bustillo, J., Cameron, J., Tuong Cao, H., , Carlin, J., et al. (2020). Neutron Star Extreme Matter Observatory: A kilohertz-band gravitational-wave detector in the global network. \pasa, 37, e047.
Barucci, M., Hasselmann, P., Praet, A., Fulchignoni, M., Deshapriya, J., Fornasier, S., Merlin, F., Clark, B., Simon, A., Hamilton, V., Emery, J., Howell, E., Brucato, J., Cloutis, E., Zou, X., Li, J. -., Michel, P., Ferrone, S., Poggiali, G., , Reuter, D., et al. (2020). OSIRIS-REx spectral analysis of (101955) Bennu by multivariate statistics. \aap, 637, L4.
DellaGiustina, D., Burke, K., Walsh, K., Smith, P., Golish, D., Bierhaus, E., Ballouz, R. -., Becker, T., Campins, H., Tatsumi, E., Yumoto, K., Sugita, S., Deshapriya, J. P., Cloutis, E., Clark, B., Hendrix, A., Sen, A., Al, A. M., Daly, M., , Applin, D., et al. (2020). Variations in color and reflectance on the surface of asteroid (101955) Bennu. Science, 370(6517), eabc3660.
Gendre, B., Coward, D., Moore, J., Burrell, A., Klotz, A., Thierry, P., Crisp, H., & Howell, E. (2020). The Zadko telescope results: ten years of science. arXiv e-prints, arXiv:2008.03902.
Hergenrother, C., Maleszewski, C., Li, J. -., Pajola, M., Chesley, S., French, A., Davis, A., Pelgrift, J., Leonard, J., Shelly, F., Liounis, A., Becker, K., Balram-Knutson, S., Garcia, R., Kareta, T., Adam, C., Alkiek, K., Bos, B., Brozovi{\'c}, M., , Burke, K., et al. (2020). Photometry of Particles Ejected From Active Asteroid (101955) Bennu. Journal of Geophysical Research (Planets), 125(9), e06381.
Hirabayashi, M., Nakano, R., Tatsumi, E., Walsh, K. J., Barnouin, O. S., Michel, P., Hartzell, C. M., Britt, D. T., Sugita, S., Watanabe, S., Bottke, W. F., Scheeres, D. J., Ballouz, R., Cho, Y., Morota, T., Howell, E. S., & Lauretta, D. S. (2020). Spin-driven evolution of asteroids' top-shapes at fast and slow spins seen from (101955) Bennu and (162173) Ryugu. \icarus, 352, 113946.
Kaplan, H. H., Hamilton, V. E., Howell, E. S., Scott Anderson, F., Barrucci, M. A., Brucato, J., Burbine, T. H., Clark, B. E., Cloutis, E. A., Connolly, H. C., Dotto, E., Emery, J. P., Fornasier, S., Lantz, C., Lim, L. F., Merlin, F., Praet, A., Reuter, D. C., Sandford, S. A., , Simon, A. A., et al. (2020). Visible-near infrared spectral indices for mapping mineralogy and chemistry with OSIRIS-REx. Meteoritics and Planetary Science, 55(4), 744-765.
Lewin, C. D., Howell, E. S., Vervack Jr., ., Fern{\'andez}, Y. R., Magri, C., Marshall, S. E., Crowell, J. L., & Hinkle, M. L. (2020). Near-infrared Spectral Characterization of Solar-type Stars in the Northern Hemisphere. \aj, 160(3), 130.
Lewin, C., Howell, E., Vervack, R., Fernandez, Y., Magri, C., Marshall, S., Crowell, J., & Hinkle, M. (2020). VizieR Online Data Catalog: SpT \& NIR color excess of Solar-type stars (Lewin+, 2020). VizieR Online Data Catalog, J/AJ/160/130.
Takir, D., Kareta, T., Emery, J. P., Hanu{\v{s}}, J., Reddy, V., Howell, E. S., Rivkin, A. S., & Arai, T. (2020). Near-infrared observations of active asteroid (3200) Phaethon reveal no evidence for hydration. Nature Communications, 11, 2050.
Busch, M. W., Ostro, S. J., Benner, L. A., Brozovic, M., Giorgini, J. D., Jao, J., Scheeres, D. J., Magri, C., Nolan, M. C., Howell, E. S., Taylor, P. A., Margot, J., & Brisken, W. (2019). Corrigendum to ``Radar observations and the shape of near-Earth asteroid 2008 EV5'' [ICARUS 212 (2011) 649-660]. \icarus, 333, 548-548.
Dellagiustina}, D., Emery, J., Golish, D., Rozitis, B., Bennett, C., Burke, K., Ballouz, R. -., Becker, K., Christensen, P., Drouet, D. C., Hamilton, V., Reuter, D., Rizk, B., Simon, A., Asphaug, E., Bandfield, J., Barnouin, O., Barucci, M., Bierhaus, E., , Binzel, R., et al. (2019). Properties of rubble-pile asteroid (101955) Bennu from OSIRIS-REx imaging and thermal analysis. Nature Astronomy, 3, 341-351.
Hamilton}, V., Simon, A., Christensen, P., Reuter, D., Clark, B., Barucci, M., Bowles, N., Boynton, W., Brucato, J., Cloutis, E., Connolly, H., Donaldson, H. K., Emery, J., Enos, H., Fornasier, S., Haberle, C., Hanna, R., Howell, E., Kaplan, H., , Keller, L., et al. (2019). Evidence for widespread hydrated minerals on asteroid (101955) Bennu. Nature Astronomy, 3, 332-340.
Hergenrother}, C., Maleszewski, C., Nolan, M., Li, J. -., Drouet, D. C., Shelly, F., Howell, E., Kareta, T., Izawa, M., Barucci, M., Bierhaus, E., Campins, H., Chesley, S., Clark, B., Christensen, E., Dellagiustina, D., Fornasier, S., Golish, D., Hartzell, C., , Rizk, B., et al. (2019). The operational environment and rotational acceleration of asteroid (101955) Bennu from OSIRIS-REx observations. Nature Communications, 10, 1291.
Lauretta}, D., Dellagiustina, D., Bennett, C., Golish, D., Becker, K., Balram-Knutson, S., Barnouin, O., Becker, T., Bottke, W., Boynton, W., Campins, H., Clark, B., Connolly, H., Drouet, D. C., Dworkin, J., Emery, J., Enos, H., Hamilton, V., Hergenrother, C., , Howell, E., et al. (2019). The unexpected surface of asteroid (101955) Bennu. \nat, 568(7750), 55-60.
Nolan, M. C., Howell, E. S., Scheeres, D., McMahon, J., Golubov, O., Hergenrother, C., Emery, J., Noll, K., Chesley, S., & Lauretta, D. (2019). Detection of Rotational Acceleration of Bennu Using HST Light Curve Observations. GRL, 46(4), 1956-1962.
Rivkin, A. S., Howell, E. S., & Emery, J. P. (2019). Infrared Spectroscopy of Large, Low-Albedo Asteroids: Are Ceres and Themis Archetypes or Outliers?. Journal of Geophysical Research (Planets), 124(5), 1393-1409.
Rozek, A., Lowry, S., Nolan, M., Taylor, P., Benner, L., Fitzsimmons, A., Zegmott, T., Weissman, P., Green, S., Rozitis, B., Snodgrass, C., Smythe, W., Hicks, M., Howell, E., Virkki, A., Aponte-Hernandez, B. .., Rivera-Valentin, E., Rodriguez-Ford, L., Zambrano-Marin, L., , Brozovic, M., et al. (2019). VizieR Online Data Catalog: PHA contact-binary (85990) 1999 JV6 light curves (Rozek+, 2019). VizieR Online Data Catalog, J/A+A/631/A149.
Ro{\.zek}, A., Lowry, S., Nolan, M., Taylor, P., Benner, L., Fitzsimmons, A., Zegmott, T., Weissman, P., Green, S., Rozitis, B., Snodgrass, C., Smythe, W., Hicks, M., Howell, E., Virkki, A., {Aponte-Hernand, e. B., Rivera-Valent{\'\in}, E., Rodriguez-Ford, L., Zambrano-Marin, L., , Brozovi{\'c}, M., et al. (2019). Shape model and spin-state analysis of PHA contact binary (85990) 1999 JV6 from combined radar and optical observations. \aap, 631, A149.
Virkki, A., Zubko, E., Nolan, M., Howell, E., Benner, L., & Harmon, J. (2019). Decimeter-scale particle characterization in the coma of 73P/Schwassmann-Wachmann 3 using dual-wavelength radar observations. \icarus, 325, 94-104.
Brozovi{\'c}, M., Benner, L., McMichael, J., Giorgini, J., Pravec, P., Scheirich, P., Magri, C., Busch, M., Jao, J., Lee, C., Snedeker, L., Silva, M., Slade, M., Semenov, B., Nolan, M., Taylor, P., Howell, E., & Lawrence, K. (2018). Goldstone and Arecibo radar observations of (99942) Apophis in 2012-2013. \icarus, 300, 115-128.
Howell, E., Magri, C., Vervack, ., Nolan, M., Taylor, P., Fern{\'andez}, Y., Hicks, M., Somers, J., Lawrence, K., Rivkin, A., Marshall, S., & Crowell, J. (2018). SHERMAN - A shape-based thermophysical model II. Application to 8567 (1996 HW1). \icarus, 303, 220-233.
Magri, C., Howell, E., Vervack, R., Nolan, M., Fern{\'andez}, Y., Marshall, S., & Crowell, J. (2018). SHERMAN, a shape-based thermophysical model. I. Model description and validation. \icarus, 303, 203-219.
Rivkin, A., Howell, E., Emery, J., & Sunshine, J. (2018). Evidence for OH or H$_2$O on the surface of 433 Eros and 1036 Ganymed. \icarus, 304, 74-82.
Shepard, M. K., Timmerson, B., Scheeres, D. J., Benner, L. A., Howell, E. S., Magri, C., Nolan, M. C., Springmann, A., Taylor, P. A., & Virkki, A. (2018). A Revised Shape Model of Asteroid (216) Kleopatra. Icarus.
Taylor, P. A., Ostro, S. J., Jurgens, R., Howell, E. S., Nolan, M. C., Slade, M., Giorgini, J. D., Jao, J., Brozovic, M., Benner, L. A., & Lawrance, K. (2018). Arecibo and Goldstone Radar Images of Near-Earth Asteroid (469896) 2005 WC1. Icarus, 300, 12-20. doi:10.1016/j.icarus.2017.08.028
Virkki, A., Taylor, P. A., Springmann, A., Nolan, M. C., Magri, C., Howell, E. S., Benner, L. A., Scheeres, D. J., Timmerson, B., & Shepard, M. K. (2018). A Revised Shape Model of Asteroid (216) Kleopatra. Icarus, 311, 197-209.
Brozovic, M., Benner, L. A., Magri, C., Scheeres, D. J., Busch, M. W., Giorgini, J. D., Nolan, M. C., Jao, J. S., Lee, C. G., Snedeker, L. G., Silva, M. A., Lawrence, K. J., Slade, M. A., Hicks, M. D., Howell, E. S., Taylor, P. A., Sanchez, J. A., Reddy, V., Dykhuis, M., & Le Corre, L. (2017). Goldstone radar evidence for short-axis mode non-principal-axis rotation of near-Earth asteroid (214869) 2007 PA8. Icarus, 286, 314-329. doi:10.1016/j.icarus.2016.10.016
DiSanti, M., Bonev, B., Dello Russo, N., Vervack, R., Gibb, E., Roth, N., McKay, A., Kawakita, H., Howell, E., Zambrano-Marin, F. .., Yoshida, S., Yoshimoto, K., Gonzalez, J., Hasubick, W., & Wierzchos, K. (2017). Comet 45P/Honda-Mrkos-Pajdusakova. Central Bureau Electronic Telegrams, 4357.
Harris, A. W., Warner, B. D., Giorgini, J. D., Benner, L. A., Howell, E. S., Nolan, M. C., Magri, C., Reddy Kanupuru, V. V., Timmerson, B., Viikinkoski, M., Kaasalainen, M., Close, L. M., Morzinski, K. M., Males, J. R., de Kleer, K., Adamkovics, M., de Pater, I., Conrad, A., Rodriguez-Ford, L. A., , Taylor, P. A., et al. (2017). Radar Observations and Shape Model of Asteroid 16 Psyche. Icarus, 281, 388-403. doi:10.1016/j.icarus.2016.08.011
Moskovitz, N., Polishook, D., DeMeo, F., Binzel, R., Endicott, T., Yang, B., Howell, E., Vervack, ., & Fern{\'andez}, Y. (2017). Near-infrared thermal emission from near-Earth asteroids: Aspect-dependent variability. \icarus, 284, 97-105.
Rivkin, A., Pravec, P., Thomas, C., Thirouin, A., Snodgrass, C., Green, S., Licandro, J., Sickafoose, A., Erasmus, N., Howell, E., Osip, D., Thomas-Osip, J. .., Moskovitz, N., Scheirich, P., Oszkiewicz, D., Richardson, D., Polishook, D., Ryan, W., & Busch, M. (2017). The Remote Observing Working Group for the Asteroid Impact and Deflection Assessment (AIDA). European Planetary Science Congress, 11, EPSC2017-401.
Sandford, S. A., Righter, K., Nakamura-Messenger, K. .., Messenger, S., Scheeres, D. J., McMahon, J. W., McCoy, T. J., Emery, J. P., Daly, M. G., Crombie, M. K., Connolly, H. C., Clark, B. E., Christensen, P. R., Chesley, S. R., Walsh, K. J., Hamilton, V. E., Bottke, W. F., Binzel, R. P., Barnouin, O. S., , Ballouz, R., et al. (2017). OSIRIS-REx: Sample Return from Asteroid (101955) Bennu. Space Science Reviews. doi:10.1007/s11214-017-0405-1
Shepard, M. K., Richardson, J., Taylor, P. A., Warner, B. D., Reddy, V., Conrad, A., de Pater, I., Adamkovics, M., de Kleer, K., Magri, C., Nolan, M. C., Howell, E. S., Benner, L. A., Giorgini, J. D., & Harris, A. W. (2016). RADAR OBSERVATIONS AND SHAPE MODEL OF ASTEROID 16 PSYCHE.. Icarus.
Taylor, P. A., Lawrence, K. J., Hicks, M. D., Crowell, J. L., Nolan, M. C., Fernández, Y. R., Campbell, D. B., Vervack, R. J., Magri, C., Howell, E. S., & Marshall, S. E. (2017). Thermal Properties and an Improved Shape Model for Near-Earth Asteroid (162421) 2000 ET70. Icarus, 292, 22-35. doi:10.1016/j.icarus.2017.03.02
Vervack, R. J., Springmann, A., Marshall, S. E., Warner, B. D., Richardson, J. E., Fernandez, Y. R., Nolan, M. C., Magri, C., Howell, E. S., & Crowell, J. L. (2017). Radar and Lightcurve Shape Model of Near-Earth Asteroid (1627) Ivar. Icarus, 291, 254-267. doi:10.1016/j.icarus.2016.11.008
Virkki, A., Taylor, P., Zambrano-Marin, L., Howell, E., Nolan, M., Lejoly, C., Rivera-Valentin, E., & Aponte, B. (2017). Near-surface bulk densities of asteroids derived from dual-polarization radar observations. European Planetary Science Congress, 11, EPSC2017-750.
Binzel, R., DeMeo, F., Burt, B., Cloutis, E., Rozitis, B., Burbine, T., Campins, H., Clark, B., Emery, J., {Hergenrother, C., Howell, E. S., Lauretta, D. S., Nolan, M. C., Mansfield, M., Pietrasz, V., Polishook, D., & Scheeres, D. (2015). Spectral slope variations for OSIRIS-REx target Asteroid (101955) Bennu: Possible evidence for a fine-grained regolith equatorial ridge. Icarus, 256, 22-29.
{Becker}, T., Howell, E. S., Nolan, M. C., {Magri}, C., {Pravec}, P., {Taylor}, P., {Oey}, J., {Higgins}, D., {Vil{\'a}gi}, J., {Korno{\v s}}, L., {Gal{\'a}d}, A., {Gajdo{\v s}}, {. S., {Gaftonyuk}, N., {Krugly}, Y., {Molotov}, I., {Hicks}, M., {Carbognani}, A., {Warner}, B., {Vachier}, F., , {Marchis}, F., et al. (2015). Physical modeling of triple near-Earth Asteroid (153591) 2001 SN263 from radar and optical light curve observations. Icarus, 248, 499-515. doi:10.1016/j.icarus.2014.10.048
{Becker}, T., {Howell}, E., {Nolan}, M., {Magri}, C., {Pravec}, P., {Taylor}, P., {Oey}, J., {Higgins}, D., {Vil{\'a}gi}, J., {Korno{\v s}}, L., {Gal{\'a}d}, A., {Gajdo{\v s}}, {. S., {Gaftonyuk}, N., {Krugly}, Y., {Molotov}, I., {Hicks}, M., {Carbognani}, A., {Warner}, B., {Vachier}, F., , {Marchis}, F., et al. (2015). Physical modeling of triple near-Earth Asteroid (153591) 2001 SN$_{263}$ from radar and optical light curve observations. \icarus, 248, 499-515.
{Benner}, L., {Brozovic}, M., {Giorgini}, J., {Jao}, J., {Lee}, C., {Taylor}, P., {Howell}, E., {Busch}, M., {Ford}, H., {Ghigo}, F., {Nolan}, M., {Slade}, M., {Lawrence}, K., {Richardson}, J., {Rivera-Valentin}, E., , A. (2015). Radar Imaging of Binary Near-Earth Asteroid (357439) 2004 BL86. IAU General Assembly, 22, 2257549.
{Fernandez}, Y., {Li}, J., {Howell}, E., , L. (2015). Asteroids and Comets. ArXiv e-prints.
{Rivkin}, A., {Campins}, H., {Emery}, J., {Howell}, E., {Licandro}, J., {Takir}, D., , F. (2015). Astronomical Observations of Volatiles on Asteroids. ArXiv e-prints.
{Rivkin}, A., {Thomas}, C., {Howell}, E., , J. (2015). The Ch-class Asteroids: Connecting a Visible Taxonomic Class to a 3 {$\mu$}m Band Shape. \aj, 150, 198.
{Shepard}, M., {Taylor}, P., {Nolan}, M., {Howell}, E., {Springmann}, A., {Giorgini}, J., {Warner}, B., {Harris}, A., {Stephens}, R., {Merline}, W., {Rivkin}, A., {Benner}, L., {Coley}, D., {Clark}, B., {Ockert-Bell}, M., , C. (2015). A radar survey of M- and X-class asteroids. III. Insights into their composition, hydration state, {\amp} structure. \icarus, 245, 38-55.
{Taylor}, P., {Howell}, E., {Nolan}, M., {Richardson}, J., , A. (2015). Physical Diversity of Near-Earth Asteroids from Arecibo Radar Observations. IAU General Assembly, 22, 2257991.
{Wooden}, D., {Lederer}, S., {Bus}, S., {Tokunaga}, A., {Jehin}, E., {Howell}, E., {Nolan}, M., {Ryan}, E., {Fernandez}, Y., {Harker}, D., {Reddy}, V., {Benner}, L., {Lovell}, A., {Moskovitz}, N., {Kerr}, T., , C. (2015). NEAs: Phase Angle Dependence of Asteroid Class and Diameter from Observational Studies. IAU General Assembly, 22, 2257359.
{Benner}, L., {Brozovic}, M., {Giorgini}, J., {Busch}, M., {Nolan}, M., {Taylor}, P., {Howell}, E., {Springmann}, A., {Jao}, J., {Lee}, C., {Slade}, M., {Mainzer}, A., {Pollock}, J., {Reichart}, D., {Haislip}, J., {Frank}, N., , A. (2014). Goldstone and Arecibo Radar Imaging of Near-Earth Asteroid 2014 HQ124. AGU Fall Meeting Abstracts.
{Bolin}, B., {Jedicke}, R., {Granvik}, M., {Brown}, P., {Howell}, E., {Nolan}, M., {Jenniskens}, P., {Chyba}, M., {Patterson}, G., , R. (2014). Detecting Earth's temporarily-captured natural satellites-Minimoons. \icarus, 241, 280-297.
{Chesley}, S., {Farnocchia}, D., {Nolan}, M., {Vokrouhlick{\'y}}, D., {Chodas}, P., {Milani}, A., {Spoto}, F., {Rozitis}, B., {Benner}, L., {Bottke}, W., {Busch}, M., {Emery}, J., {Howell}, E., {Lauretta}, D., {Margot}, J., , P. (2014). Orbit and bulk density of the OSIRIS-REx target Asteroid (101955) Bennu. \icarus, 235, 5-22.
{Giorgini}, J., Howell, E. S., {Taylor}, P., {Richardson}, J., {Ford}, L., {Zambrano-Marin}, L., Nolan, M. C., {Brozovic}, M., , L. (2014). (2340) Hathor. \iaucirc, 9272.
{Hergenrother}, C., {Barucci}, M., {Barnouin}, O., {Bierhaus}, B., {Binzel}, R., {Bottke}, W., {Chesley}, S., {Clark}, B., {Clark}, B., {Cloutis}, E., {Drouet d'Aubigny}, C., {Delbo}, M., {Emery}, J., {Gaskell}, B., {Howell}, E., {Keller}, L., {Kelley}, M., {Marshall}, J., {Michel}, P., , {Nolan}, M., et al. (2014). The Design Reference Asteroid for the OSIRIS-REx Mission Target (101955) Bennu. ArXiv e-prints.
{Busch}, M., {Jacobson}, S., {Benner}, L., {Brozovic}, M., {Howell}, E., {Margot}, J., {Naidu}, S., {Shepard}, M., , P. (2013). A Lower Size Limit for Near-Earth Asteroid Satellites. AGU Fall Meeting Abstracts.
{Consolmagno}, G., {Schaefer}, M., {Schaefer}, B., {Britt}, D., {Macke}, R., {Nolan}, M., , E. (2013). Low temperature heat capacities of solar system materials. European Planetary Science Congress 2013, held 8-13 September in London, UK.~Online at: http://meetings.copernicus.org/epsc2013, id.EPSC2013-248, 8, EPSC2013-248.
{Consolmagno}, G., {Schaefer}, M., {Schaefer}, B., {Britt}, D., {Macke}, R., {Nolan}, M., , E. (2013). The measurement of meteorite heat capacity at low temperatures using liquid nitrogen vaporization. \planss, 87, 146-156.
{Nolan}, M., {Magri}, C., {Howell}, E., {Benner}, L., {Giorgini}, J., {Hergenrother}, C., {Hudson}, R., {Lauretta}, D., {Margot}, J., {Ostro}, S., , D. (2013). Asteroid (101955) Bennu Shape Model V1.0. NASA Planetary Data System, 211.
{Nolan}, M., {Magri}, C., {Howell}, E., {Benner}, L., {Giorgini}, J., {Hergenrother}, C., {Hudson}, R., {Lauretta}, D., {Margot}, J., {Ostro}, S., , D. (2013). Shape model and surface properties of the OSIRIS-REx target Asteroid (101955) Bennu from radar and lightcurve observations. \icarus, 226, 629-640.
{Rivkin}, A., {Howell}, E., {Vervack}, R., {Magri}, C., {Nolan}, M., {Fernandez}, Y., {Cheng}, A., {Antonietta Barucci}, M., , P. (2013). The NEO (175706) 1996 FG3 in the 2-4 {$\mu$}m spectral region: Evidence for an aqueously altered surface. \icarus, 223, 493-498.
{Brozovic}, M., {Benner}, L., {Taylor}, P., {Howell}, E., {Nolan}, M., {Margot}, J., {Giorgini}, J., {Busch}, M., {Naidu}, S., {Nugent}, C., {Magri}, C., , M. (2012). 2007 LE. Central Bureau Electronic Telegrams, 3175.
{Rivkin}, A., {Howell}, E., {Emery}, J., {Volquardsen}, E., , F. (2012). Toward a taxonomy of asteroid spectra in the 3-{$\mu$}m region. AGU Fall Meeting Abstracts.
{Taylor}, P., {Nolan}, M., , E. (2012). (5143) Heracles. Central Bureau Electronic Telegrams, 3176.
{Taylor}, P., {Nolan}, M., {Howell}, E., {Benner}, L., {Brozovic}, M., {Giorgini}, J., {Margot}, J., {Busch}, M., {Naidu}, S., {Nugent}, C., {Magri}, C., , M. (2012). 2004 FG11. Central Bureau Electronic Telegrams, 3091.
{Brozovi{\'c}}, M., {Benner}, L., {Taylor}, P., {Nolan}, M., {Howell}, E., {Magri}, C., {Scheeres}, D., {Giorgini}, J., {Pollock}, J., {Pravec}, P., {Gal{\'a}d}, A., {Fang}, J., {Margot}, J., {Busch}, M., {Shepard}, M., {Reichart}, D., {Ivarsen}, K., {Haislip}, J., {LaCluyze}, A., , {Jao}, J., et al. (2011). Radar and optical observations and physical modeling of triple near-Earth Asteroid (136617) 1994 CC. \icarus, 216, 241-256.
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{Clark}, B., {Binzel}, R., {Howell}, E., {Cloutis}, E., {Ockert-Bell}, M., {Christensen}, P., {Barucci}, M., {DeMeo}, F., {Lauretta}, D., {Connolly}, H., {Soderberg}, A., {Hergenrother}, C., {Lim}, L., {Emery}, J., , M. (2011). Asteroid (101955) 1999 RQ36: Spectroscopy from 0.4 to 2.4 {$\mu$}m and meteorite analogs. \icarus, 216, 462-475.
{Delbo}, M., {Walsh}, K., {Mueller}, M., {Harris}, A., , E. (2011). The cool surfaces of binary near-Earth asteroids. \icarus, 212, 138-148.
{Harmon}, J., {Nolan}, M., {Howell}, E., {Giorgini}, J., , P. (2011). Radar Observations of Comet 103P/Hartley 2. \apjl, 734, L2.
{Howell}, E., , A. (2011). (596) Scheila. Central Bureau Electronic Telegrams, 2632.
{Howell}, E., , A. (2011). (596) Scheila. \iaucirc, 9191.
{Magri}, C., Howell, E. S., Nolan, M. C., {Taylor}, P., {Fern{\'a}ndez}, Y., {Mueller}, M., {Vervack}, R., {Benner}, L., {Giorgini}, J., {Ostro}, S., {Scheeres}, D., {Hicks}, M., {Rhoades}, H., {Somers}, J., {Gaftonyuk}, N., {Kouprianov}, V., {Krugly}, Y., {Molotov}, I., {Busch}, M., , {Margot}, J., et al. (2011). Radar and photometric observations and shape modeling of contact binary near-Earth Asteroid (8567) 1996 HW1. \icarus, 214, 210-227.
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{Rivkin}, A., {Clark}, B., {Ockert-Bell}, M., {Volquardsen}, E., {Howell}, E., {Bus}, S., {Thomas}, C., , M. (2011). Asteroid 21 Lutetia at 3 {$\mu$}m: Observations with IRTF SpeX. \icarus, 216, 62-68.
{Shepard}, M., {Harris}, A., {Taylor}, P., {Clark}, B., {Ockert-Bell}, M., {Nolan}, M., {Howell}, E., {Magri}, C., {Giorgini}, J., , L. (2011). Radar observations of Asteroids 64 Angelina and 69 Hesperia. \icarus, 215, 547-551.
{Ziffer}, J., {Campins}, H., {Licandro}, J., {Walker}, M., {Fernandez}, Y., {Clark}, B., {Mothe-Diniz}, T., {Howell}, E., , R. (2011). Near-infrared spectroscopy of primitive asteroid families. \icarus, 213, 538-546.
{Campins}, H., {Hargrove}, K., {Pinilla-Alonso}, N., {Howell}, E., {Kelley}, M., {Licandro}, J., {Moth{\'e}-Diniz}, T., {Fern{\'a}ndez}, Y., , J. (2010). Water ice and organics on the surface of the asteroid 24 Themis. \nat, 464, 1320-1321.
{Harmon}, J., {Nolan}, M., {Giorgini}, J., , E. (2010). Radar observations of 8P/Tuttle: A contact-binary comet. \icarus, 207, 499-502.
{Harmon}, J., {Nolan}, M., {Howell}, E., {Giorgini}, J., {Samarasinha}, N., {Mueller}, B., {A'Hearn}, M., {Farnham}, T., {Drahus}, M., {Jewitt}, D., {Guilbert}, A., {Lis}, D., , W. (2010). Comet 103P/Hartley. Central Bureau Electronic Telegrams, 2515.
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{Benner}, L., {Ostro}, S., {Magri}, C., {Nolan}, M., {Howell}, E., {Giorgini}, J., {Jurgens}, R., {Margot}, J., {Taylor}, P., {Busch}, M., , M. (2008). Near-Earth asteroid surface roughness depends on compositional class. \icarus, 198, 294-304.
{Harmon}, J., {Nolan}, M., {Howell}, E., , J. (2008). Comet 8P/Tuttle. \iaucirc, 8909.
{Lovell}, A., {Howell}, E., , D. (2008). Comet C/2007 W1 (Boattini). \iaucirc, 8957.
{Nolan}, M., {Howell}, E., {Benner}, L., {Ostro}, S., {Giorgini}, J., {Busch}, M., {Carter}, L., {Anderson}, R., {Magri}, C., {Campbell}, D., {Margot}, J., , R. (2008). (153591) 2001 SN\_263. Central Bureau Electronic Telegrams, 1254.
{Shepard}, M., {Clark}, B., {Nolan}, M., {Howell}, E., {Magri}, C., {Giorgini}, J., {Benner}, L., {Ostro}, S., {Harris}, A., {Warner}, B., {Pray}, D., {Pravec}, P., {Fauerbach}, M., {Bennett}, T., {Klotz}, A., {Behrend}, R., {Correia}, H., {Coloma}, J., {Casulli}, S., , A. (2008). A radar survey of M- and X-class asteroids. \icarus, 195, 184-205.
{Shepard}, M., {Kressler}, K., {Clark}, B., {Ockert-Bell}, M., {Nolan}, M., {Howell}, E., {Magri}, C., {Giorgini}, J., {Benner}, L., , S. (2008). Radar observations of E-class Asteroids 44 Nysa and 434 Hungaria. \icarus, 195, 220-225.
{Busch}, M., {Ostro}, S., {Benner}, L., {Giorgini}, J., {Magri}, C., {Howell}, E., {Nolan}, M., {Hine}, A., {Campbell}, D., {Shapiro}, I., , J. (2007). Arecibo radar observations of Phobos and Deimos. \icarus, 186, 581-584.
{Howell}, E., {Lovell}, A., {Butler}, B., , F. (2007). Radio OH observations of 9P/Tempel 1 before and after Deep Impact. \icarus, 187, 228-239.
{Nolan}, M., {Harmon}, J., {Howell}, E., {Campbell}, D., , J. (2006). Detection of large grains in the coma of Comet C/2001 A2 (LINEAR) from Arecibo radar observations. \icarus, 181, 432-441.
{Pravec}, P., {Scheirich}, P., {Ku{\v s}nir{\'a}k}, P., {{\v S}arounov{\'a}}, L., {Mottola}, S., {Hahn}, G., {Brown}, P., {Esquerdo}, G., {Kaiser}, N., {Krzeminski}, Z., {Pray}, D., {Warner}, B., {Harris}, A., {Nolan}, M., {Howell}, E., {Benner}, L., {Margot}, J., {Gal{\'a}d}, A., {Holliday}, W., , {Hicks}, M., et al. (2006). Photometric survey of binary near-Earth asteroids. \icarus, 181, 63-93.
{Howell}, E., {Rivkin}, A., {Nolan}, M., {Margot}, J., {Black}, G., {Bus}, S., {Hicks}, M., {Reach}, W., {Jarrett}, H., , R. (2005). Observations of 2002 NY 40: an ordinary chondrite?. Highlights of Astronomy, 13, 771-772.
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{Nolan}, M., {Benner}, L., {Black}, G., {Campbell}, D., {Giorgini}, J., {Hine}, A., {Howell}, E., {Margot}, J., , S. (2005). Radar Observations of Near-Earth Asteroids. Highlights of Astronomy, 13, 759.
{Ostro}, S., {Benner}, L., {Giorgini}, J., {Nolan}, M., {Hine}, A., {Howell}, E., {Margot}, J., {Magri}, C., , M. (2005). (1862) Apollo. \iaucirc, 8627.
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{Heiles}, C., {Perillat}, P., {Nolan}, M., {Lorimer}, D., {Bhat}, R., {Ghosh}, T., {Howell}, E., {Lewis}, M., {O'Neil}, K., {Salter}, C., , S. (2001). All-Stokes Parameterization of the Main Beam and First Sidelobe for the Arecibo Radio Telescope. \pasp, 113, 1247-1273.
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Proceedings Publications

Howell, E., Vervack, R., Fernandez, Y., Hinkle, M., Myers, S., & Magri, C. (2024, apr). Putting Near-Earth Asteroid (99942) Apophis into Context. In Apophis T-5 Workshop, 3006.
Myers, S., Howell, E., Fernandez, Y., & Marshall, S. (2024, oct). Guidance for Using NEOWISE Data for NEA Observations. In AAS/Division for Planetary Sciences Meeting Abstracts, 56.
Rivera-Valentin, E., Aponte, H. B., Taylor, P., Nolan, M., Howell, E., Waller, D., Zambrano-Marin, L., Virkki, A., Ballouz, R., & Stickle, A. (2024, oct). On the Radar Detectability of Near-Earth Asteroid Surface Refreshing Processes. In AAS/Division for Planetary Sciences Meeting Abstracts, 56.
Zambrano-Marin, L., Marshall, S., Brisset, J., Venditti, F., Nolan, M., Howell, E., Christian, R., & Morales, G. (2024, apr). A Collaborative Platform for Asking about Apophis: Addressing Public Interest and Global Reach. In Apophis T-5 Workshop, 3006.
Zambrano-Marin}, L. F., Marshall, S., Howell, E., Leon, J., & Pinilla-Alonso, N. (2024, oct). Shape and Mutual Orbit Modeling of Binary Near-Earth Asteroid 2020 BX$_12$. In AAS/Division for Planetary Sciences Meeting Abstracts, 56.
Brozovic, M., Benner, L., Nolan, M., Pravec, P., Magri, C., & Howell, E. (2023, oct). Spin and shape of near-Earth asteroid (53319) 1999 JM8 from radar and lightcurve observations in 1999. In AAS/Division for Planetary Sciences Meeting Abstracts, 55.
Myers, S., Howell, E., Magri, C., Vervack, R., & Fernandez, Y. (2023, oct). Differences in NEA Simple Thermal Model Results Between IRTF SpeX and NEOWISE Data. In AAS/Division for Planetary Sciences Meeting Abstracts, 55.
Rivera-Valent{\'\in}, E., Aponte, H. B., Taylor, P., Devog{\`ele}, M., Zambrano-Marin, L., Howell, E., Nolan, M., & Virkki, A. (2023, oct). Kernel Density Estimation of the Distribution of Asteroid Radar Polarization Ratios as a Function of Taxonomy. In AAS/Division for Planetary Sciences Meeting Abstracts, 55.
Howell, E., Vervack, R., Fernandez, Y., Hinkle, M., McFadden, K., Myers, S., Marshall, S., Magri, C., & Crowell, J. (2022, dec). Constraining the Spectral Homogeneity of Near-Earth Asteroids. In AAS/Division for Planetary Sciences Meeting Abstracts, 54.
Margot, J., Howell, E. S., Repp, D., McGlasson, R., Presler-Marshall, B., L{\'opez-Oquendo}, A., Nolan, M. C., Sanchez-Vahamonde,, C. R., Hernandez, B., Bhiravarasu, S., Diaz, E. F., Devogele, M., McGilvray, A., Rivera-Valentin, E., Taylor, P., Hickson, D., Marin, L. F., Venditti, F., Marshall, S., & Virkki, A. K. (2022, dec). Arecibo Planetary Radar Observations of Near-Earth Asteroids: December 2017 - December 2019. In AAS/Division for Planetary Sciences Meeting Abstracts, 54.
McFadden, K., Howell, E., Vervack, R., Fernandez, Y., Magri, C., & Carter, L. (2022, dec). Mid-Infrared Thermophysical Models of Near-Earth Asteroid 2100 Ra-Shalom. In AAS/Division for Planetary Sciences Meeting Abstracts, 54.
Myers, S., Howell, E., Magri, C., Vervack, R., Fernandez, Y., Marshall, S., & Taylor, P. (2022, dec). Comparison of NEATM-like Models with NASA IRTF and NEOWISE Observations of Near-Earth Asteroid (285263) 1998 QE2. In AAS/Division for Planetary Sciences Meeting Abstracts, 54.
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{DeRemer}, L., {Howell}, E., {Nolan}, M., , J. (2001, nov). Arecibo Radar Observations of Three Small Near-Earth Asteroids. In AAS/Division for Planetary Sciences Meeting Abstracts \#33, 33.
{Howell}, E., {Lovell}, A., , F. (2001, may). Observations of the 18-cm OH lines in Comet C/1999 S4 LINEAR and Comet C/2000 T1 McNaught-Hartley. In American Astronomical Society Meeting Abstracts \#198, 33.
{Howell}, E., {Nolan}, M., {DeRemer}, L., , J. (2001, nov). Arecibo Radar Observations of Near-Earth Asteroid 2000 EE104. In AAS/Division for Planetary Sciences Meeting Abstracts \#33, 33.
{Howell}, E., {Rivkin}, A., {Vilas}, F., , A. (2001, mar). Aqueous Alteration in Low Albedo Asteroids. In Lunar and Planetary Science Conference, 32.
{Nolan}, M., {Howell}, E., {Harmon}, J., {Campbell}, D., {Margot}, J., , J. (2001, nov). Arecibo Radar Observations of C/2001A2(B) (LINEAR). In AAS/Division for Planetary Sciences Meeting Abstracts \#33, 33.
{Nolan}, M., {Margot}, J., {Howell}, E., {Benner}, L., {Ostro}, S., {Jurgens}, R., {Giorgini}, J., , D. (2001, mar). Radar Observations of Near-Earth Asteroids 2000 UG11 and 2000 UK11. In Lunar and Planetary Science Conference, 32.
{Rivkin}, A., , E. (2001, nov). E-class Asteroids: Troilite, Hydrated Minerals, Both, or Neither?. In AAS/Division for Planetary Sciences Meeting Abstracts \#33, 33.
{Nolan}, M., {Margot}, J., {Howell}, E., {Hine}, A., {Crespo}, A., {Negr{\'o}n}, V., {Perrilat}, P., {Magri}, C., {Ostro}, S., {Giorgini}, J., , D. (2000, oct). Arecibo Radar Observations of Main-Belt Asteroids in 2000. In AAS/Division for Planetary Sciences Meeting Abstracts \#32, 32.
{Schloerb}, F., {Lovell}, A., , E. (2000, oct). Radio Observations of OH in C/1999 LINEAR S4. In AAS/Division for Planetary Sciences Meeting Abstracts \#32, 32.
{Howell}, E., {Rivkin}, A., {Soderberg}, A., {Vilas}, F., , A. (1999, sep). Aqueous Alteration of Asteroids: Correlation of the 3 MU M and 0.7 MU M Hydration Bands. In AAS/Division for Planetary Sciences Meeting Abstracts \#31, 31.
{Howell}, E., {Rivkin}, A., {Soderberg}, A., {Vilas}, F., , A. (1999, sep). Aqueous alteration of asteroids: correlation of the 3 {$\mu$}m and 0.7 {$\mu$}m hydration bands.. In Bulletin of the American Astronomical Society, 31.
{Jarvis}, K., {Vilas}, F., {Howell}, E., {Kelley}, M., , A. (1999, sep). Testing the Prediction of Iron Alteration Minerals on Low Albedo Asteroids. In AAS/Division for Planetary Sciences Meeting Abstracts \#31, 31.
{Jarvis}, K., {Vilas}, F., {Howell}, E., {Kelley}, M., , A. (1999, sep). Testing the prediction of iron alteration minerals on low albedo asteroids.. In Bulletin of the American Astronomical Society, 31.
{Soderberg}, A., , E. (1999, dec). 0.7 {$\mu$} m Observations of Hydrated Central Belt Asteroids. In American Astronomical Society Meeting Abstracts, 31.
{Rivkin}, A., {Britt}, D., {Lebofsky}, L., {Howell}, E., , B. (1997). Correlation of Water of Hydration with Diameter in Tholen E-class and M-class Asteroids. In Parent-Body and Nebular Modification of Chondritic Materials.
{Rivkin}, A., {Howell}, E., {Clark}, B., {Lebofsky}, L., , D. (1997, mar). S-class asteroids - The view from three microns. In Lunar and Planetary Science Conference, 28.
{Rivkin}, A., {Lebofsky}, L., {Britt}, D., , E. (1997, jul). Three-Micron Survey of E- and M-class Asteroids: Final Results. In AAS/Division for Planetary Sciences Meeting Abstracts \#29, 29.
{Howell}, E., {Rivkin}, A., , L. (1996, sep). Spectral Trends of S-Class Asteroids with Size and Dynamical Population. In AAS/Division for Planetary Sciences Meeting Abstracts \#28, 28.
{Howell}, E., {Rivkin}, A., , L. (1996, sep). Spectral trends of S-class asteroids with size and dynamical population.. In Bulletin of the American Astronomical Society, 28.
{Merenyi}, E., {Howell}, E., {Rivkin}, A., , L. (1996, sep). Prediction of Water in Asteroids from Short Wavelength ($\lt$ 3 Micron) Spectral Data: A Neural Network Study, II. In AAS/Division for Planetary Sciences Meeting Abstracts \#28, 28.
{Howell}, E., {Rivkin}, A., {Binzel}, R., , S. (1995, jun). Spectral Observations of the Mars Trojan 5261 Eureka. In AAS/Division for Planetary Sciences Meeting Abstracts \#27, 27.
{Howell}, E., {Rivkin}, A., {Binzel}, R., , S. (1995, mar). Spectral Observations of the Mars Trojan 5261 Eureka. In Lunar and Planetary Science Conference, 26.
{Mer{\'e}nyi}, E., {Howell}, E., {Rivkin}, A., , L. (1995, jun). Asteroid Classification Based on Water of Hydration: A Neural Network Study. In AAS/Division for Planetary Sciences Meeting Abstracts \#27, 27.
{Mottola}, S., {Erikson}, A., {Harris}, A., {Hahn}, G., {Neukum}, G., {Buie}, M., {Sears}, W., {Harris}, A., {Tholen}, D., {Whiteley}, R., {Magnusson}, P., {Piironen}, J., {Kwiatkowski}, T., {Howell}, E., {Hicks}, M., {Krugly}, Y., {Gaftonyuk}, N., {Velichko}, F., {di Martino}, M., , {de Sanctis}, G., et al. (1995, jun). Physical Model of Near-Earth Asteroid (6489) 1991 JX from Optical and Infrared Observations. In AAS/Division for Planetary Sciences Meeting Abstracts \#27, 27.
{Britt}, D., {Rivkin}, A., {Howell}, E., , L. (1994, jun). Observations of ''Dry'' C Class Asteroids. In AAS/Division for Planetary Sciences Meeting Abstracts \#26, 26.
{Howell}, E., {Rivkin}, A., {Marcialis}, R., {Nolan}, M., {Grier}, J., {Bus}, S., , S. (1994, jun). Spectral Observations of Near-Earth Asteroids. In AAS/Division for Planetary Sciences Meeting Abstracts \#26, 26.
{Larson}, H., {Montani}, J., {Lebofsky}, L., {Rivkin}, A., {Howell}, E., , C. (1994, jun). Volatiles in Asteroidal Surface Minerals. In AAS/Division for Planetary Sciences Meeting Abstracts \#26, 26.
{Larson}, S., {Scotti}, J., {Howell}, E., {Marcialis}, R., {Nolan}, M., {Wisniewski}, W., {A'Hearn}, M., {Wellnitz}, D., {Campins}, H., {Rabinowitz}, D., {Butner}, H., {Tapia}, S., {Vilas}, F., {Doherty}, P., {Bessell}, M., {Brosch}, N., {Liebowitz}, E., {Gilmore}, A., {Kervin}, P., , {Africano}, J., et al. (1994, jun). The Comet Impact Network Experiment (CINE). In AAS/Division for Planetary Sciences Meeting Abstracts \#26, 26.
{Lebofsky}, L., {Britt}, D., {Howell}, E., , A. (1994, mar). The Nature of Low Albedo Asteroids from 3-{$\mu$}m Spectrophotometry. In Lunar and Planetary Science Conference, 25.
{Rivkin}, A., {Britt}, D., {Howell}, E., , L. (1994, mar). Hydrated E-class and M-class Asteroids. In Lunar and Planetary Science Conference, 25.
{Rivkin}, A., {Howell}, E., {Britt}, D., , L. (1994, jun). Determination of Near-IR Continua for M-asteroids. In AAS/Division for Planetary Sciences Meeting Abstracts \#26, 26.
{Scotti}, J., {Larson}, S., {Howell}, E., {Marcialis}, R., {Nolan}, M., {Wisniewski}, W., {A'Hearn}, M., {Wellnitz}, D., {Campins}, H., {Rabinowitz}, D., {Butner}, H., {Tapia}, S., {Vilas}, F., {Doherty}, P., {Bessell}, M., {Brosch}, N., {Liebowitz}, E., {Gilmore}, A., {Kervin}, P., , {Africano}, J., et al. (1994, jun). Preliminary Results from CINE. In AAS/Division for Planetary Sciences Meeting Abstracts \#26, 26.
{Britt}, D., {Howell}, E., {Bell}, J., , L. (1993, mar). The 1.2 to 3.5 microns observations of asteroid 4179 Toutatis. In Lunar and Planetary Science Conference, 24.
{Britt}, D., {Rivkin}, A., {Howell}, E., , L. (1993, jun). 1.2 to 2.5 {$\mu$}m Observations of C Class Asteroids. In AAS/Division for Planetary Sciences Meeting Abstracts \#25, 25.
{Howell}, E., {Mer{\'e}nyi}, E., , L. (1993). A Neural Network Asteroid Classification Based on Water of Hydration. In Asteroids, Comets, Meteors 1993, 810.
{Howell}, E., {Nolan}, M., , L. (1993, jun). CCD Observations of Near-Earth Asteroids. In AAS/Division for Planetary Sciences Meeting Abstracts \#25, 25.
{Lebofsky}, L., {Britt}, D., {Howell}, E., {Bell}, J., , R. (1993, jun). 0.3 to 3.5 {$\mu$}m Observations of 4179 Toutatis. In AAS/Division for Planetary Sciences Meeting Abstracts \#25, 25.
{Rivkin}, A., {Howell}, E., {Britt}, D., , L. (1993, jun). Near-IR Observations of M-class Asteroids. In AAS/Division for Planetary Sciences Meeting Abstracts \#25, 25.
{Britt}, D., {Lebofsky}, L., , E. (1992, jun). The Hydration State of Main-Belt C-Class Asteroids. In AAS/Division for Planetary Sciences Meeting Abstracts \#24, 24.
{Howell}, E., {Lebofsky}, L., {Nolan}, M., & Castillo}, E. (1992, jun). Compositional Trends Among Outer Belt Asteroids. In AAS/Division for Planetary Sciences Meeting Abstracts \#24, 24.
{Lebofsky}, L., {Howell}, E., {Rivkin}, A., {Nolan}, M., , T. (1992, jun). Near-IR Observations of M-class Asteroids. In AAS/Division for Planetary Sciences Meeting Abstracts \#24, 24.
{Mer{\'e}nyi}, E., {Howell}, E., , L. (1992, jun). A Neural Network Asteroid Classification Based on Water of Hydration. In AAS/Division for Planetary Sciences Meeting Abstracts \#24, 24.
{Rabinowitz}, D., {Scotti}, J., {Gehrels}, T., {Wisniewski}, W., {Larson}, S., {Howell}, E., , B. (1992, jun). Peculiar Asteroids with Earth-Like Orbits. In AAS/Division for Planetary Sciences Meeting Abstracts \#24, 24.
{Buratti}, B., {Marcialis}, R., {Howell}, E., , M. (1991). CCD Photometry of 2060 Chiron, 1991 January. In Asteroids, Comets, Meteors 1991, 765.
{Howell}, E., , L. (1991). Near-infrared observations of primitive asteroids and a possible extinct comet. In Resources of Near-Earth Space.
{Howell}, E., {Mer{\'e}nyi}, E., , L. (1991). Using Neural Networks to Classify Asteroid Spectra. In 54th Annual Meeting of the Meteoritical Society, 766.
{Howell}, E., {Mer{\'e}nyi}, E., , L. (1991, jun). Using Neural Networks to Classify Asteroid Spectra. In Bulletin of the American Astronomical Society, 23.
{Lebofsky}, L., {Howell}, E., , D. (1991). Characterization of Low Albedo Asteroids. In 54th Annual Meeting of the Meteoritical Society, 766.
{Lebofsky}, L., {Howell}, E., , D. (1991, jun). Characterization of Low Albedo Asteroids. In Bulletin of the American Astronomical Society, 23.
{Howell}, E., , L. (1990, jun). Near-Infrared Observations of Primitive Asteroids. In Bulletin of the American Astronomical Society, 22.
{Lutz}, B., {Howell}, E., , V. (1990, jun). Gas and Dust Production by Comet P/Halley (1910 II). In Bulletin of the American Astronomical Society, 22.

Presentations

Scheeres, D. J., Margot, J. L., Magri, C., Lauretta, D. S., Kerr, R., Howell, E. S., Giorgini, J. D., Benner, L. A., & Nolan, M. C. (2017, December). Radar Observations of Asteroid 101955 Bennu and the OSIRIS-REx Sample Return Mission. 2017 Fall Meeting, AGU. New Orleans, LA: AGU.

Others

Rivkin, A. S., Howell, E. S., Pope, B., Thomas, C. A., & Vervack, R. (2021). Analysis of Low-Albedo Asteroids Observed through JWST Guaranteed Time.
{Howell}, E. (1995). Probing Asteroid Composition Using Visible and Near-Infrared Spectroscopy.

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Ellen Susanna Howell

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Ellen Susanna Howell

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