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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 105 (heliocentric ecliptic J2000)
| Element | Value | Uncertainty (1-sigma) | Units |
| e | .1947093342436802 | 2.9671e-08 | |
| a | 2.652997727128682 | 4.2034e-09 | au |
| q | 2.136434305929459 | 7.9426e-08 | au |
| i | 11.95939853609563 | 3.145e-06 | deg |
| node | 203.1041676432834 | 1.6114e-05 | deg |
| peri | 122.901625098835 | 1.7853e-05 | deg |
| M | 312.1195469063817 | 8.8441e-06 | deg |
| tp | 2459210.422743933603
(2020-Dec-26.92274393) | 3.8954e-05 | TDB |
| period | 1578.351559629869
4.32 | 3.7511e-06
1.027e-08 | d
yr |
| n | .2280860672665484 | 5.4207e-10 | deg/d |
| Q | 3.169561148327904 | 5.0219e-09 | au |
|
| | Orbit Determination Parameters
Additional Information
|
[ show covariance matrix ]
Physical Parameter Table
| Parameter |
Symbol |
Value |
Units |
Sigma |
Reference |
Notes |
| absolute magnitude |
H |
7.7 |
|
n/a |
MPO473761 |
IRAS observations used: 8 |
| diameter |
diameter |
154.79 |
km |
3.8 |
IRAS-A-FPA-3-RDR-IMPS-V6.0 |
IRAS observations used: 8 |
| rotation period |
rot_per |
6.875 |
h |
n/a |
LCDB (Rev. 2020-October); Warner et al., 2009 |
Published Reference List:
[Yang, X.-y.; Zhang, Y.-y.; Li, X.-q. (1965) Acta Astron. Sin. 13, 66-74.]
[Lagerkvist, C.-I.; Schober, H.J. (1981) Astron. Astrophys. Suppl. Ser. 44, 401-404.]
[Erikson, A.; Berthier, J.; Denchev, P.V.; Harris, A.W.; et al. (1999) Planet. Space Sci. 47, 327-330.]
[Torppa, J.; Kaasalainen, M.; Michalowski, T.; Kwiatkowski, T.; et al. (2003) Icarus 164, 346-383.]
[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2011) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Durech, J.; Kaasalainen, M.; Herald, D.; Dunham, D.; et al. (2011) Icarus 214, 652-670.]
[Hanus, J.; Marchis, F.; Durech, J. (2013) Icarus 226, 1045-1057.]
[Behrend, R. (2016) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Hanus, J.; Viikinkoski, M.; Marchis, F.; Durech, J.; et al (2017) Astron. Astrophys. 601, A114.]
[Carbognani, A.; Cellino, A.; Caminiti, S. (2019) Planet. Space Sci. 169, 15-34.]
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.] |
| geometric albedo |
albedo |
0.0666 |
|
0.003 |
IRAS-A-FPA-3-RDR-IMPS-V6.0 |
IRAS observations used: 8 |
| B-V |
BV |
0.668 |
|
0.023 |
EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 |
#obs=8; phase (min.=6.05, mean=11.20, max.=19.29) deg. |
| U-B |
UB |
0.294 |
|
0.015 |
EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 |
#obs=7; phase (min.=6.05, mean=10.95, max.=19.29) deg. |
| Tholen spectral type |
spec_T |
FC |
|
n/a |
EAR-A-5-DDR-TAXONOMY-V4.0 |
used 7 color indices; used ground-based radiometric albedo |
| SMASSII spectral type |
spec_B |
B |
|
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) |
|
| 85 Io (A865 SA) Discovered 1865-Sep-19 by Peters, C. H. F. at Clinton |
| Reference: DISCOVERY.DB | Last Updated: 2003-08-29 |
|
Alternate Designations
| A865 SA = A899 LA = A899 UA |
|
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