Asteroids with Satellites Database--Johnston's Archive
(121)
Hermione
and S/2002 (121) 1 ("LaFayette")
compiled by Wm. Robert Johnston
last updated
21 September 2014
--Orbital and physical data--
(See this page for definitions of quantities; source codes in brackets, see this link for full references; *A, *D, and *E indicate assumed, derived, and estimated values, respectively.)
dynamical type, primary:
main belt asteroid, outer
orbital data, primary (osculating elements)
[JPL]
:
semimajor axis a: |
3.450115270 AU
|
orbital period P: |
6.408532783 yr (= 2340.716599 d)
|
eccentricity e: |
0.134268194
|
perihelion distance q: |
2.98687453 AU
|
aphelion distance Q: |
3.913356016 AU
|
inclination i: |
7.5964736°
|
argument of perihelion ω: |
298.357981°
|
ascending node Ω: |
73.145747°
|
mean anomaly M: |
301.356905°
|
perihelion passage TP: |
2015 Jun 08.29685
|
Epoch: |
2014 May 23
|
data arc: |
1872-2013
(1624 obs.)
|
Earth MOID: |
1.9961 AU
|
Jupiter Tisserand invariant TJ: |
3.108
|
orbital data, secondary:
binary dynamical type: | L [P07f] |
semimajor axis as: |
747
± 11 km
[D09a]
|
separation/primary radius as/rp: | 8.0 [*D] |
separation/Hill radius as/rH: | 0.018 [*D] |
orbital period Ps: |
2.563
± 0.0021
d [D09a]
|
eccentricity es: |
0.00
[D09a]
|
inclination is: | 3° ± 2° [M05f] |
normalized ang. mom. αL: |
0.73
[P07f]
|
|
other data, system (combined):
absolute mag. H: |
7.31
[MPC]
|
slope parameter G: |
(0.15) [*A]
|
effective diameter dE: |
190
km [*D]
|
geometric albedo: |
0.05
± 0.01
[D09a]
|
color index U-B: |
0.425
[T95a]
|
color index B-V: |
0.73
[B96c]
|
taxonomic type: |
Ch (SMASSII) [JPL]
C (Tholen) [JPL]
|
mass m: |
4.7x1018
± 2x1017
kg [D09a]
|
density ρ: |
1.4
± 0.35
g/cm3[D09a]
|
Hill radius rH: |
41000 km [*D]
|
other data, primary:
diameter dp: |
187
± 6
km [D09a]
|
rotation period RPp: |
5.551
± 0.000
h [D09a]
|
amplitude in mag., rotational ΔM: |
0.7
[W14e]
|
pole direction Β, λ: |
?
,
?
|
other data, secondary:
diameter ds: |
32
km [D09a]
|
diameter ratio ds/dp: |
0.171
[*D]
|
component mag. difference ΔM: |
3.8
[*D]
|
rotation period RPs: |
?
|
|
|
--
(121) Hermione and S/2002 (121) 1
--discovery and notes:
Primary discovered
1872 May 12
from
Ann Arbor, Michigan, USA
by
J. C. Watson.
Alternate designation(s):
1970 VE.
Permanent number assigned 1872.
Named - for the Greek mythological daughter of Menelaus.
Companion discovered
2002 Sep 28
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
adaptive optics telescope
observations from W. M. Keck II Telescope, Mauna Kea, Hawaii, USA.
Announced
2002 Sep 30 [M02e].
Provisional designation S/2002 (121) 1.
Proposed name: "LaFayette".
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
- Noll, Keith S., Ryan, E. L., Grundy, W. M., & Benecchi, S. D. 2013, AAS/Division for Planetary Sciences Meeting Abstracts Ultra-Slow Rotating Outer Main Belt and Trojan Asteroids: Search for Binaries
- Hargrove, Kelsey D., Kelley, Michael S., Campins, Humberto, Licandro, Javier, & Emery, Josh 2012, Icarus Asteroids (65) Cybele, (107) Camilla and (121) Hermione: Infrared spectral diversity among the Cybeles
- Li, Bin, Zhao, Haibin, & Yao, Jingshen 2011, Minor Planet Bulletin The Lightcurve Analysis of Five Asteroids
- Hargrove, K. D., Campins, H., & Kelley, M. 2011, EPSC-DPS Joint Meeting 2011 Progress Report on Study of Cybele Group Asteroids
- Vokrouhlický, David, Nesvorný, David, Bottke, William F., & Morbidelli, Alessandro 2010, The Astronomical Journal Collisionally Born Family About 87 Sylvia
- Descamps, P., Marchis, F., Durech, J., Emery, J., Harris, A. W., Kaasalainen, M., Berthier, J., Teng-Chuen-Yu, J.-P., Peyrot, A., Hutton, L., Greene, J., Pollock, J., Assafin, M., Vieira-Martins, R., Camargo, J. I. B., Braga-Ribas, F., Vachier, F., Reichart, D. E., Ivarsen, K. M., Crain, J. A., Nysewander, M. C., Lacluyze, A. P., Haislip, J. B., Behrend, R., Colas, F., Lecacheux, J., Bernasconi, L., Roy, R., Baudouin, P., Brunetto, L., Sposetti, S., & Manzini, F. 2009, Icarus New insights on the binary Asteroid 121 Hermione
- Marchis, Franck 2009, American Astronomical Society Meeting Abstracts #214 Multiple Asteroid Systems: Search Programs and Studies with AO
- Marchis, F., Descamps, P., Durech, J., Emery, J. P., Harris, A. W., Kaasalainen, M., & Berthier, J. 2009, Lunar and Planetary Science Conference The Cybele Binary Asteroid 121 Hermione Revisited
- Descamps, P., Marchis, F., Pollock, J., Berthier, J., Vachier, F., Michalowski, T., Teng, J.-P., Peyrot, A., & Benard, C. 2007, Central Bureau Electronic Telegrams (121) hermione.
- Marchis, F., Kaasalainen, M., Hom, E. F. Y., Berthier, J., Enriquez, J., Hestroffer, D., Le Mignant, D., & de Pater, I. 2006, Icarus Shape, size and multiplicity of main-belt asteroids. I. Keck Adaptive Optics survey
- Hestroffer, Daniel, Tanga, P., Cellino, A., Kaasalainen, M., Torppa, J., Marchis, F., Richardson, D. C., Elankumaran, P., Berthier, J., Colas, F., & Lounis, S. 2006, Bulletin of the American Astronomical Society HST/FGS High Angular Resolution Observations of Binary Asteroids
- Marchis, Franck, Berthier, Jerome, Descamps, Pascal, & Hestroffer, Daniel 2006, NOAO Proposal Refining the Orbits of Known Main-Belt Binary Asteroids
- Marchis, F., Hestroffer, D., Descamps, P., Berthier, J., Laver, C., & de Pater, I. 2005, Icarus Mass and density of Asteroid 121 Hermione from an analysis of its companion orbit
- Corbisiero, Massimo 2005, Astronomia. La rivista dell' Unione Astrofili Italiani 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, Bulletin of the American Astronomical Society 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, Bulletin of the American Astronomical Society 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 Studying binary asteroids with NGS and LGS AO systems
- Bus, S. & Binzel, R. P. 2004, NASA Planetary Data System 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
- Merline, W. J., Close, L. M., Dumas, C., Chapman, C. R., Menard, F., Tamblyn, P. M., & Durda, D. D. 2003, Bulletin of the American Astronomical Society Discovery of new asteroid binaries (121) Hermione and (1509) Esclangona
- Marchis, F., Descamps, P., Berthier, J., Hestroffer, D., de Pater, I., Conrad, A., Le Mignant, D., Chaffee, F., & Gavel, D. 2003, Bulletin of the American Astronomical Society Searching and Studying Binary Asteroids with AO Systems
- 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, Bulletin of the American Astronomical Society Asteroid Bulk Density
- Viateau, B. 2000, Astronomy and Astrophysics Mass and density of asteroids (16) Psyche and (121) Hermione
- Dunham, D. W. 1996, Occultation Newsletter, International Occultation Timing Association (IOTA) The occultation of δ<SUP>3</SUP>Tauri by (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, The Astronomical Journal Representations of observations of thirty-four minor planets belonging to a group which includes the group one-half.
- Hiltner, W. A. 1948, The Astronomical Journal The light curves of two Wolf-Rayet stars in Cepheus.
- 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
©
2002-2008, 2014
by Wm. Robert Johnston.
Last modified
21 September 2014.
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