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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 41 (heliocentric ecliptic J2000)
| Element | Value | Uncertainty (1-sigma) | Units |
| e | .03827645862204656 | 1.6175e-08 | |
| a | 2.856161697342827 | 8.2801e-09 | au |
| q | 2.74683794231661 | 4.8747e-08 | au |
| i | 2.213785649048582 | 3.4755e-07 | deg |
| node | 166.1255166955962 | 2.4888e-05 | deg |
| peri | 130.9970275197597 | 4.1596e-05 | deg |
| M | 6.829326290688338 | 2.9912e-05 | deg |
| tp | 2459167.053708148512
(2020-Nov-13.55370815) | 0.00014653 | TDB |
| period | 1763.082411650612
4.83 | 7.6669e-06
2.099e-08 | d
yr |
| n | .2041878460252831 | 8.8793e-10 | deg/d |
| Q | 2.965485452369044 | 8.5971e-09 | au |
|
| | Orbit Determination Parameters
Additional Information
|
[ show covariance matrix ]
Physical Parameter Table
| Parameter |
Symbol |
Value |
Units |
Sigma |
Reference |
Notes |
| absolute magnitude |
H |
9.22 |
|
n/a |
E2021B10 |
|
| diameter |
diameter |
39.935 |
km |
0.264 |
urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M) |
|
| rotation period |
rot_per |
13.07 |
h |
n/a |
LCDB (Rev. 2020-October); Warner et al., 2009 |
Published Reference List:
[Slivan, S.M.; Binzel, R.P. (1996) Icarus 124, 452-470.]
[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Warner, B.D. (2008) Minor Planet Bull. 35, 67-71.]
[Warner, B.D.; Durech, J.; Faurerbach, M.; Marks, S. (2008) Minor Planet Bull. 35, 167-171.]
[Durech, J.; Kaasalainen, M.; Herald, D.; Dunham, D.; et al. (2011) Icarus 214, 652-670.]
[Erasmus, N.; Navarro-Meza, S.; McNeill, A.; Trilling, D.E.; et al. (2020) Ap. J. Suppl. Ser. 247, A13.] |
| geometric albedo |
albedo |
0.223 |
|
0.021 |
urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M) |
|
| B-V |
BV |
0.837 |
|
0.038 |
EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 |
#obs=3; phase (min.=4.74, mean=12.85, max.=18.02) deg. |
| U-B |
UB |
0.400 |
|
0.040 |
EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 |
#obs=3; phase (min.=4.74, mean=12.85, max.=18.02) deg. |
| Tholen spectral type |
spec_T |
S |
|
n/a |
EAR-A-5-DDR-TAXONOMY-V4.0 |
used 4 color indices |
| SMASSII spectral type |
spec_B |
Sk |
|
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) |
|
| 167 Urda (A876 QA) Discovered 1876-Aug-28 by Peters, C. H. F. at Clinton |
| Reference: DISCOVERY.DB | Last Updated: 2003-08-29 |
|
[ show close-approach data ]
Alternate Designations
| A876 QA = A899 KC = A905 QA = A906 WA |
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