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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 37 (heliocentric ecliptic J2000)
Element | Value | Uncertainty (1-sigma) | Units |
e | .2039039532325345 | 3.9889e-08 | |
a | 2.739836532493444 | 1.0264e-08 | au |
q | 2.181173032307111 | 1.0965e-07 | au |
i | 17.2990401150193 | 4.7057e-06 | deg |
node | 72.76329440014617 | 1.4051e-05 | deg |
peri | 127.0394532062972 | 1.7656e-05 | deg |
M | 51.41037272868557 | 1.0942e-05 | deg |
tp | 2458763.944169421442 (2019-Oct-07.44416942) | 4.9888e-05 | TDB |
period | 1656.476980972439 4.54 | 9.3079e-06 2.548e-08 | d yr |
n | .2173287067283368 | 1.2212e-09 | deg/d |
Q | 3.298500032679777 | 1.2356e-08 | au |
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| | Orbit Determination Parameters
Additional Information
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Physical Parameter Table
Parameter |
Symbol |
Value |
Units |
Sigma |
Reference |
Notes |
absolute magnitude |
H |
10.9 |
|
n/a |
MPO384761 |
|
diameter |
diameter |
40.871 |
km |
0.279 |
urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M) |
|
rotation period |
rot_per |
12.1923 |
h |
n/a |
LCDB (Rev. 2020-October); Warner et al., 2009 |
Published Reference List: [Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Julian, W.M. (2006) Minor Planet Bull. 33, 103-104.] [Durech, J.; Hanus, J.; Oszkiewsicz, D.; Vanco, R. (2016) Astron. Astrophys. 587, A48.] |
geometric albedo |
albedo |
0.015 |
|
0.009 |
urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M) |
|
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) |
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1484 Postrema (1938 HC) Discovered 1938-Apr-29 by Neujmin, G. at Simeis |
Reference: DISCOVERY.DB | Last Updated: 2003-08-29 |
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Alternate Designations
1938 HC = 1933 DH = A911 KC |
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