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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 111 (heliocentric ecliptic J2000)
Element | Value | Uncertainty (1-sigma) | Units |
e | .1286175095705726 | 2.8682e-08 | |
a | 3.462434207360603 | 1.2487e-08 | au |
q | 3.017104542557923 | 1.0034e-07 | au |
i | 7.569239597626376 | 3.1263e-06 | deg |
node | 73.01624834844354 | 2.2347e-05 | deg |
peri | 296.5796829474195 | 2.56e-05 | deg |
M | 312.0666354774943 | 1.3695e-05 | deg |
tp | 2459513.832998400307 (2021-Oct-26.33299840) | 9.0538e-05 | TDB |
period | 2353.2643816636 6.44 | 1.2731e-05 3.486e-08 | d yr |
n | .1529789864687895 | 8.2758e-10 | deg/d |
Q | 3.907763872163284 | 1.4093e-08 | au |
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| | Orbit Determination Parameters
Additional Information
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Physical Parameter Table
Parameter |
Symbol |
Value |
Units |
Sigma |
Reference |
Notes |
absolute magnitude |
H |
7.37 |
|
n/a |
E2021B10 |
IRAS observations used: 16 |
diameter |
diameter |
209.00 |
km |
4.7 |
IRAS-A-FPA-3-RDR-IMPS-V6.0 |
IRAS observations used: 16 |
rotation period |
rot_per |
5.55128 |
h |
n/a |
LCDB (Rev. 2020-October); Warner et al., 2009 |
Published Reference List: [Piironen, J.; Bowell, E.; Erikson, A.; Magnusson, P. (1994) Astron. Astrophys. Suppl. Ser. 106, 587-595.] [Behrend, R. (2004) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Marchis, F.; Hestroffer, D.; Descamps, P.; Berthier, J.; et al. (2005) Icarus 178, 450-464.] [Descampes, P.; Marchis, F.; Durech, J.; Emery, J.; et al. (2009) Icarus 203, 88-101.] [Behrend, R. (2011) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Li, B.; Zhao, H.; Yao, J. (2011) Minor Planet Bull. 38, 179-180.] [Sergison, D. (2011) www.gothersobservatory.org.uk/lightcurves.htm] [Kaasalainen, M.; Viikinkoski, M. (2012) Astron. Astrophys. 543, A97.] [Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.] [Viikinkoski, M.; Hanus, J.; Kaasalainen, M.; Marchis, F.; Durech, J. (2017) Astron. Astrophys. 607, A117.] |
geometric albedo |
albedo |
0.0482 |
|
0.002 |
IRAS-A-FPA-3-RDR-IMPS-V6.0 |
IRAS observations used: 16 |
B-V |
BV |
0.739 |
|
0.033 |
EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 |
#obs=4; phase (min.=4.77, mean=13.89, max.=18.88) deg. |
U-B |
UB |
0.425 |
|
0.087 |
EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 |
#obs=4; phase (min.=4.77, mean=13.89, max.=18.88) deg. |
Tholen spectral type |
spec_T |
C |
|
n/a |
EAR-A-5-DDR-TAXONOMY-V4.0 |
used 7 color indices; used ground-based radiometric albedo |
SMASSII spectral type |
spec_B |
Ch |
|
n/a |
EAR-A-5-DDR-TAXONOMY-V4.0 |
based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002) |
|
121 Hermione (A872 JA) Discovered 1872-May-12 by Watson, J. C. at Ann Arbor |
Reference: DISCOVERY.DB | Last Updated: 2003-08-29 |
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