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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 174 (heliocentric ecliptic J2000)
| Element | Value | Uncertainty (1-sigma) | Units |
| e | .1973025153789553 | 1.261e-08 | |
| a | 2.711027937602364 | 7.0363e-09 | au |
| q | 2.176135306250796 | 3.3556e-08 | au |
| i | 11.79821787902355 | 1.6159e-07 | deg |
| node | 313.24677488712 | 8.5714e-07 | deg |
| peri | 345.0504860577076 | 2.1335e-06 | deg |
| M | 106.6242632551815 | 2.6032e-06 | deg |
| tp | 2458517.604721567479
(2019-Feb-03.10472157) | 1.028e-05 | TDB |
| period | 1630.419708689143
4.46 | 6.3475e-06
1.738e-08 | d
yr |
| n | .2208020413893548 | 8.5962e-10 | deg/d |
| Q | 3.245920568953932 | 8.4246e-09 | au |
|
| | Orbit Determination Parameters
Additional Information
|
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Physical Parameter Table
| Parameter |
Symbol |
Value |
Units |
Sigma |
Reference |
Notes |
| absolute magnitude |
H |
7.8 |
|
n/a |
MPO492748 |
IRAS observations used: 14 |
| diameter |
diameter |
160.120 |
km |
1.857 |
urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M) |
|
| rotation period |
rot_per |
7.024 |
h |
n/a |
LCDB (Rev. 2020-October); Warner et al., 2009 |
Published Reference List:
[Van Houten-Groeneveld, I.; van Houten, C.J.; Zappala, V. (1979) Astron. Astrophys. Suppl. Ser. 35, 223-232.]
[Di Martino, M.; Zappala, V.; De Sanctis, G.; Cacciatori, S. (1987) Icarus 69, 338-353.]
[Bel'skaya, I.N.; Dovgopol, A.N.; Erikson, A.; Lagerkvist, C.-I.; Oja, T. (1993) Astron. Astrophys. Suppl. Ser. 101, 507-511.]
[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Torppa, J.; Hentunen, V.-P.; Paakkonen, P.; Kehusmaa, P.; Muinonen, K. (2008) Icarus 198, 91-107.]
[Warner, B.D.; Durech, J.; Faurerbach, M.; Marks, S. (2008) Minor Planet Bull. 35, 167-171.]
[Higgins, D.; Warner, B.D. (2009) Minor Planet Bull. 36, 159-160.]
[Durech, J.; Kaasalainen, M.; Herald, D.; Dunham, D.; et al. (2011) Icarus 214, 652-670.]
[Durech, J. (2011) Database of Asteroid Models from Inversion Techniques (DAMIT). http://astro.troja.mff.cuni.cz/projects/asteroids3D/web.php]
[Hanus, J.; Marchis, F.; Durech, J. (2013) Icarus 226, 1045-1057.]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.]
[Hanus, J.; Viikinkoski, M.; Marchis, F.; Durech, J.; et al (2017) Astron. Astrophys. 601, A114.]
[Behrend, R. (2019) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] |
| geometric albedo |
albedo |
0.059 |
|
0.014 |
urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M) |
|
| B-V |
BV |
0.727 |
|
0.027 |
EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 |
#obs=9; phase (min.=4.77, mean=11.55, max.=25.49) deg. |
| U-B |
UB |
0.357 |
|
0.037 |
EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 |
#obs=7; phase (min.=4.77, mean=11.92, max.=25.49) 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 |
C |
|
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) |
|
| 54 Alexandra (A858 RA) Discovered 1858-Sep-10 by Goldschmidt, H. at Paris |
| Reference: DISCOVERY.DB | Last Updated: 2003-08-29 |
|
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Alternate Designations
| A858 RA = 1950 BT = 1974 HG1 |
|
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