Orbital elements and other data (Assumed or derived values in parenthesis, my estimates in italics and parenthesis. Source identifications in brackets, see this link for sources):

--(121) Hermione--discovery and notes:

Primary discovered 12 May 1872 by James C. Watson from Ann Arbor, Michigan, USA.

Companion discovered 28 September 2002 by W. J. Merline, P. M. Tamblyn, C. Dumas, L. M. Close, C. R. Chapman, F. Menard, W. M. Owen, D. C. Slater, and J. Pepin using the Keck II telescope at Mauna Kea; announced 30 September 2002. The name "LaFayette" has been proposed [MAf].

See more information and links at Asteroid/Comet Connection Catchall Catalog page

--Links, more technical:

• IAUC 7980.
• IAUC 8264.
• IAUC 8285.
• 121 Hermione and S/2002 (121) 1.
• Bi-lobated shape of 121 Hermione.

--Links, less technical:

--Links to ADS abstracts:

• Corbisiero, Massimo 2005, Astronomia. La rivista dell'Unione Astrofili Italiani (ISSN 0392-2308), N. 2, p. 26 - 29 (marzo-aprile 2005) 16 febbraio 2004. 121 Hermione occulta la stella TYC 1905-00864-1 in Gemini
• Marchis, F., Descamps, P., Hestroffer, D., Berthier, J., & de Pater, I. 2004, AAS/Division for Planetary Sciences Meeting Abstracts Fine Analysis of 121 Hermione, 45 Eugenia, and 90 Antiope Binary Asteroid Systems With AO Observations
• Berthier, J., Marchis, F., Descamps, P., & Hestroffer, D. 2004, AAS/Division for Planetary Sciences Meeting Abstracts Prediction of stellar occultations by satellite of asteroids
• Marchis, Franck, Berthier, Jerome, Descamps, Pascal, Hestroffer, Daniel, Vachier, Frederic, Laver, Conor, de Pater, Imke, & Gavel, Don T. 2004, Advancements in Adaptive Optics. Edited by Domenico B. Calia, Brent L. Ellerbroek, and Roberto Ragazzoni. Proceedings of the SPIE, Volume 5490, pp. 338-350 (2004). Studying binary asteroids with NGS and LGS AO systems
• Bus, S. & Binzel, R. P. 2004, NASA Planetary Data System, EAR-A-I0028-4-SBN0001/SMASSII-V1.0:121HERMIO01 121 Hermione CCD Spectrum
• Lecacheux, J., Marchis, F., De Pater, I., Hestroffer, D., Descamps, P., & Berthier, J. 2004, International Astronomical Union Circular S/2002 (121) 1
• Marchis, F., Laver, C., Berthier, J., Descamps, P., Hestroffer, D., de Pater, I., Behrend, R., Roy, R., & Baudoin, P. 2004, International Astronomical Union Circular (121) Hermione
• Marchis, F., Descamps, P., Berthier, J., Hestroffer, D., de Pater, I., Conrad, A., Le Mignant, D., Chaffee, F., & Gavel, D. 2003, AAS/Division for Planetary Sciences Meeting Searching and Studying Binary Asteroids with AO Systems
• Merline, W. J., Close, L. M., Dumas, C., Chapman, C. R., Menard, F., Tamblyn, P. M., & Durda, D. D. 2003, AAS/Division for Planetary Sciences Meeting Discovery of new asteroid binaries (121) Hermione and (1509) Esclangona
• Merline, W. J., Tamblyn, P. M., Dumas, C., Close, L. M., Chapman, C. R., Menard, F., Owen, W. M., Slater, D. C., & Pepin, J. 2002, International Astronomical Union Circular S/2002 (121) 1
• Galád, A. & Gray, B. 2002, Astronomy and Astrophysics Asteroid encounters suitable for mass determinations
• Britt, D. T. & Consolmagno, G. J. 2000, AAS/Division for Planetary Sciences Meeting Asteroid Bulk Density
• Viateau, B. 2000, Astronomy and Astrophysics Mass and density of asteroids (16) Psyche and (121) Hermione
• Blanco, C., di Martino, M., de Sanctis, G., & Riccioli, D. 1996, Planetary and Space Science Lightcurves, pole direction and shape of asteroids 121 Hermione, 150 Nuwa, 236 Honoria, 287 Nephthys and 377 Campania
• Piironen, J., Bowell, E., Erikson, A., & Magnusson, P. 1994, Astronomy and Astrophysics Supplement Series Photometry of eleven asteroids at small phase angles.
• Hutton, R. G. 1990, Minor Planet Bulletin V+B Photoelectric Photometry of Asteroids 121 Hermione, 264 Libussa, and 354 Eleonora
• di Martino, M., Zappala, V., de Sanctis, G., & Cacciatori, S. 1987, Icarus Photoelectric photometry of 17 asteroids
• Debehogne, H., Surdej, A., & Surdej, J. 1978, Astronomy and Astrophysics Supplement Series Photoelectric lightcurves of the minor planets 29 Amphitrite, 121 Hermione and 185 Eunike
• McDonald, Sophia L. & Steel, Thomas B., Jr. 1952, Astronomical Journal Representations of observations of thirty-four minor planets belonging to a group which includes the group one-half.
• Leuschner, Armin Otto & Levy, Sophia Hazel 1935, Lick Observatory Bulletin Opposition ephemerides of minor planets (94) Aurora, (100) Hecate, ( 104) Clymene, (106) Dione, (121) Hermione, (133) Cyrene, (168) Sibylla, (175) Andromache
• Levy, Sophia H. 1934, Publications of the Astronomical Society of the Pacific Minor Planet (121) Hermione: A Critical Test of the Berkeley Tables of Perturbations by Jupiter for the Hecuba Group
• 1896, Monthly Notices of the Royal Astronomical Society (121) Hermione, observed at the Royal Observatory Edinburgh

© 2002-2004, 2005 by Wm. Robert Johnston.
Last modified 1 September 2005.
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