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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 47 (heliocentric ecliptic J2000)
| Element | Value | Uncertainty (1-sigma) | Units |
| e | .1348849865167611 | 1.5465e-08 | |
| a | 2.418331315043462 | 5.4365e-09 | au |
| q | 2.092134728220763 | 3.6476e-08 | au |
| i | 2.239514817985877 | 4.8574e-07 | deg |
| node | 291.2226311792924 | 2.0726e-05 | deg |
| peri | 291.8147486936635 | 1.9176e-05 | deg |
| M | 200.4376084826633 | 5.3234e-06 | deg |
| tp | 2459809.335773409672
(2022-Aug-17.83577341) | 2.0988e-05 | TDB |
| period | 1373.637461454491
3.76 | 4.632e-06
1.268e-08 | d
yr |
| n | .2620778845233371 | 8.8375e-10 | deg/d |
| Q | 2.744527901866161 | 6.1699e-09 | au |
|
| | Orbit Determination Parameters
Additional Information
|
[ show covariance matrix ]
Physical Parameter Table
| Parameter |
Symbol |
Value |
Units |
Sigma |
Reference |
Notes |
| absolute magnitude |
H |
10.3 |
|
n/a |
MPO492750 |
IRAS observations used: 6 |
| diameter |
diameter |
54.812 |
km |
0.277 |
urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M) |
|
| rotation period |
rot_per |
9.764 |
h |
n/a |
LCDB (Rev. 2020-October); Warner et al., 2009 |
Published Reference List:
[Dotto, E.; Rotundi, A.; De Sanctis, M.C. (1992) in Physical Properties of Small Solar System Bodies. A. Brahic, J.-C. Gerard, J. Surdej, eds. Universite de Liege, Institut d'Astrophysique, Liege, p. 211.]
[Barucci, M.A.; Di Martino, M.; Dotto, E.; Fulchignoni, M.; et al. (1994) Icarus 109, 267-273.]
[Behrend, R. (2018) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Pilcher, F. (2018) Minor Planet Bull. 45, 246-247.] |
| geometric albedo |
albedo |
0.047 |
|
0.007 |
urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M) |
|
| B-V |
BV |
0.621 |
|
0.022 |
EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 |
#obs=7; phase (min.=1.32, mean=10.93, max.=25.85) deg. |
| U-B |
UB |
0.236 |
|
0.035 |
EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 |
#obs=7; phase (min.=1.32, mean=10.93, max.=25.85) deg. |
| Tholen spectral type |
spec_T |
F |
|
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) |
|
| 142 Polana (A875 BA) Discovered 1875-Jan-28 by Palisa, J. at Pola |
| Reference: DISCOVERY.DB | Last Updated: 2003-08-29 |
|
Alternate Designations
| A875 BA = 1954 BH = 1956 XZ = 1963 SA = A923 WA |
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