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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 94 (heliocentric ecliptic J2000)
| Element | Value | Uncertainty (1-sigma) | Units |
| e | .08111494370355615 | 2.3367e-08 | |
| a | 2.734107142115517 | 6.2178e-09 | au |
| q | 2.512330195203326 | 6.5665e-08 | au |
| i | 5.95920266322285 | 4.145e-07 | deg |
| node | 56.81839663918135 | 2.9963e-06 | deg |
| peri | 282.1847173106542 | 9.7319e-06 | deg |
| M | 338.7955245112335 | 8.203e-06 | deg |
| tp | 2459297.762796988758
(2021-Mar-24.26279699) | 3.7644e-05 | TDB |
| period | 1651.283802539815
4.52 | 5.6329e-06
1.542e-08 | d
yr |
| n | .2180121911486623 | 7.4369e-10 | deg/d |
| Q | 2.955884089027708 | 6.7221e-09 | au |
|
| | Orbit Determination Parameters
Additional Information
|
[ show covariance matrix ]
Physical Parameter Table
| Parameter |
Symbol |
Value |
Units |
Sigma |
Reference |
Notes |
| absolute magnitude |
H |
7.85 |
|
n/a |
E2021B10 |
IRAS observations used: 15 |
| magnitude slope |
G |
0.20 |
|
n/a |
PDS3 (MPC 17257) |
Fit |
| diameter |
diameter |
86.09 |
km |
2.0 |
IRAS-A-FPA-3-RDR-IMPS-V6.0 |
IRAS observations used: 15 |
| rotation period |
rot_per |
10.927 |
h |
n/a |
LCDB (Rev. 2020-October); Warner et al., 2009 |
Published Reference List:
[Taylor, R.C.; Gehrels, T.; Silvester, A.B. (1971) Astron. J. 76, 141-146.]
[Pray, D. (2004) Minor Planet Bull. 31, 34-36.]
[Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Durech, J.; Kaasalainen, M.; Marciniak, A.; et al. (2007) Astron. Astrophys. 465, 331-337.]
[Behrend, R. (2008) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Warner, B.D.; Stephens, R.D.; Harris, A.W.; Shepard, M.K. (2009) Minor Planet Bull. 36, 38-39.]
[Stephens, Robert D.; Warner, Brian D. (2013) Minor Planet Bull. 40, 93-94.]
[Warner, B.D. (2014) Minor Planet Bull. 41, 144-155.]
[Behrend, R. (2015) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.] |
| geometric albedo |
albedo |
0.1808 |
|
0.009 |
IRAS-A-FPA-3-RDR-IMPS-V6.0 |
IRAS observations used: 15 |
| B-V |
BV |
0.705 |
|
0.020 |
EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 |
#obs=25; phase (min.=.52, mean=7.62, max.=19.59) deg. |
| U-B |
UB |
0.298 |
|
0.031 |
EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 |
#obs=14; phase (min.=.52, mean=7.70, max.=19.59) deg. |
| Tholen spectral type |
spec_T |
M |
|
n/a |
EAR-A-5-DDR-TAXONOMY-V4.0 |
used 7 color indices; used ground-based radiometric albedo |
| SMASSII spectral type |
spec_B |
X |
|
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) |
|
| 110 Lydia (A870 HA) Discovered 1870-Apr-19 by Borrelly, A. at Marseille |
| Reference: DISCOVERY.DB | Last Updated: 2003-08-29 |
|
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Alternate Designations
| A870 HA = 1972 YS1 = A899 VA |
|
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