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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 31 (heliocentric ecliptic J2000)
Element | Value | Uncertainty (1-sigma) | Units |
e | .2176812832803072 | 1.4244e-08 | |
a | 2.378021901668445 | 5.3874e-09 | au |
q | 1.860371042444581 | 3.3604e-08 | au |
i | 9.621127730638422 | 6.8202e-07 | deg |
node | 334.6942618573211 | 3.1068e-06 | deg |
peri | 42.08111427562576 | 4.6642e-06 | deg |
M | 294.5496510850628 | 6.079e-06 | deg |
tp | 2459444.018335983639 (2021-Aug-17.51833598) | 2.3132e-05 | TDB |
period | 1339.436724287692 3.67 | 4.5517e-06 1.246e-08 | d yr |
n | .2687696951055652 | 9.1334e-10 | deg/d |
Q | 2.895672760892309 | 6.5601e-09 | 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 |
11.31 |
|
n/a |
E2021B10 |
IRAS observations used: 15 |
diameter |
diameter |
34.83 |
km |
1.1 |
IRAS-A-FPA-3-RDR-IMPS-V6.0 |
IRAS observations used: 15 |
rotation period |
rot_per |
84.94 |
h |
n/a |
LCDB (Rev. 2020-October); Warner et al., 2009 |
Published Reference List: [Binzel, R.P. (1987) Icarus 72, 135-208.] [Pilcher, F. (2015) Minor Planet Bull. 42, 190-192.] [Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.] |
geometric albedo |
albedo |
0.0428 |
|
0.003 |
IRAS-A-FPA-3-RDR-IMPS-V6.0 |
IRAS observations used: 15 |
B-V |
BV |
0.750 |
|
0.020 |
EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 |
#obs=1; phase=17.77 deg. |
U-B |
UB |
0.330 |
|
0.030 |
EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 |
#obs=1; phase=17.77 deg. |
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249 Ilse (A885 QA) Discovered 1885-Aug-16 by Peters, C. H. F. at Clinton |
Reference: DISCOVERY.DB | Last Updated: 2003-08-29 |
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