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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 131 (heliocentric ecliptic J2000)
Element | Value | Uncertainty (1-sigma) | Units |
e | .07553165633287429 | 3.5136e-08 | |
a | 2.629800194719764 | 5.818e-09 | au |
q | 2.431167030188065 | 9.2617e-08 | au |
i | 2.957549528414398 | 4.1459e-06 | deg |
node | 187.9741712484224 | 6.6805e-05 | deg |
peri | 62.24446475137153 | 7.1975e-05 | deg |
M | 352.603711620471 | 2.7908e-05 | deg |
tp | 2459232.503235824706 (2021-Jan-18.00323582) | 0.00012078 | TDB |
period | 1557.695469092559 4.26 | 5.1692e-06 1.415e-08 | d yr |
n | .2311106420626102 | 7.6694e-10 | deg/d |
Q | 2.828433359251463 | 6.2574e-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 |
8.13 |
|
n/a |
E2021B10 |
IRAS observations used: 12 |
magnitude slope |
G |
0.19 |
|
n/a |
PDS3 (MPC 17257) |
Fit |
diameter |
diameter |
88.648 |
km |
1.651 |
urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M) |
|
rotation period |
rot_per |
9.906 |
h |
n/a |
LCDB (Rev. 2020-October); Warner et al., 2009 |
Published Reference List: [Harris, A.W.; Young, J.W. (1983) Icarus 54, 59-109.] [Shevchenko, V.G.; Bel'skaya, I.N.; Krugly, Yu.N.; Chiorny, V.G.; Gaftonyuk, N.M. (2002) Icarus 155, 365-374.] [Behrend, R. (2007) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Pilcher, F. (2016) Minor Planet Bull. 43, 296-299.] |
geometric albedo |
albedo |
0.128 |
|
0.014 |
urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M) |
|
B-V |
BV |
0.844 |
|
0.019 |
EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 |
#obs=6; phase (min.=4.53, mean=15.83, max.=22.07) deg. |
U-B |
UB |
0.424 |
|
0.032 |
EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 |
#obs=6; phase (min.=4.53, mean=14.22, max.=20.37) deg. |
Tholen spectral type |
spec_T |
S |
|
n/a |
EAR-A-5-DDR-TAXONOMY-V4.0 |
used 7 color indices; used ground-based radiometric albedo |
SMASSII spectral type |
spec_B |
S |
|
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) |
|
124 Alkeste (A872 QA) Discovered 1872-Aug-23 by Peters, C. H. F. at Clinton |
Reference: DISCOVERY.DB | Last Updated: 2003-08-29 |
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