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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 124 (heliocentric ecliptic J2000)
Element | Value | Uncertainty (1-sigma) | Units |
e | .1702603055396135 | 3.2053e-08 | |
a | 2.976822651103346 | 7.7347e-09 | au |
q | 2.469987916989248 | 9.4797e-08 | au |
i | 8.590967437432171 | 3.8213e-06 | deg |
node | 184.9850108400011 | 2.3722e-05 | deg |
peri | 289.1127733990655 | 2.6496e-05 | deg |
M | 17.8971398321458 | 1.2603e-05 | deg |
tp | 2458907.237081921060 (2020-Feb-27.73708192) | 6.5513e-05 | TDB |
period | 1875.978554300247 5.14 | 7.3115e-06 2.002e-08 | d yr |
n | .1918998483083846 | 7.4792e-10 | deg/d |
Q | 3.483657385217444 | 9.0516e-09 | au |
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| | Orbit Determination Parameters
Additional Information
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[ hide covariance matrix ]
Orbital Elements at Epoch 2454304.5 (2007-Jul-23.0) TDB
Reference: JPL 124 (heliocentric ecliptic J2000)
Element | Value | Uncertainty (1-sigma) | Units |
e | .1679548282777342 | 3.2216e-08 | |
q | 2.47751719172965 | 9.5095e-08 | au |
tp | 2455160.283442729215 (2009-Nov-24.78344273) | 6.1727e-05 | TDB |
node | 185.077426774259 | 2.375e-05 | deg |
peri | 289.9264801367241 | 2.6592e-05 | deg |
i | 8.582113821367001 | 3.8185e-06 | deg |
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| | Orbit Determination Parameters
Additional Information
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Orbit Covariance (6×6)
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|
e |
q |
tp |
node |
peri |
i |
e |
1.037898448024911E-15 |
-3.056870548189481E-15 |
-1.154094718307005E-13 |
7.475945426724657E-15 |
-3.227242994511068E-15 |
4.696456912683513E-16 |
q |
-3.056870548189481E-15 |
9.043133614469543E-15 |
4.018278358794302E-13 |
-2.042586873065366E-14 |
1.327287432867317E-14 |
-8.289886299407164E-16 |
tp |
-1.154094718307005E-13 |
4.018278358794302E-13 |
3.810246715886985E-9 |
-1.378945800112508E-11 |
7.490501260341134E-10 |
1.196608965242185E-12 |
node |
7.475945426724657E-15 |
-2.042586873065366E-14 |
-1.378945800112508E-11 |
5.64068369779622E-10 |
-5.601387918409557E-10 |
1.036747154004028E-11 |
peri |
-3.227242994511068E-15 |
1.327287432867317E-14 |
7.490501260341134E-10 |
-5.601387918409557E-10 |
7.07134438524914E-10 |
-9.968380548200426E-12 |
i |
4.696456912683513E-16 |
-8.289886299407164E-16 |
1.196608965242185E-12 |
1.036747154004028E-11 |
-9.968380548200426E-12 |
1.458104710077207E-11 |
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Physical Parameter Table
Parameter |
Symbol |
Value |
Units |
Sigma |
Reference |
Notes |
absolute magnitude |
H |
7.2 |
|
n/a |
MPO492748 |
IRAS observations used: 3 |
magnitude slope |
G |
0.19 |
|
n/a |
PDS3 (MPC 17257) |
Fit |
diameter |
diameter |
138.13 |
km |
4.7 |
IRAS-A-FPA-3-RDR-IMPS-V6.0 |
IRAS observations used: 3 |
rotation period |
rot_per |
5.655 |
h |
n/a |
LCDB (Rev. 2020-October); Warner et al., 2009 |
Published Reference List: [Poutanen, M.; Bowell, E.; Martin, L.J.; Thompson, D.T. (1985) Astron. Astrophys. Suppl. Ser. 61, 291-297.] [Di Martino, M.; Zappala, V.; De Sanctis, G.; Cacciatori, S. (1987) Icarus 69, 338-353.] [Velichko, F.P.; Krugly, Yu.N. (1989) In 'Methods of investigation of movement, physics and dynamic of Solar System small bodies, Dushanbe, p. 14-15 (in Russian).] [De Angelis, G.; Mottola, S. (1995) Planet. Space Sci. 43, 1013-1017.] [Hainaut-Rouelle, M.-C.; Hainaut, O.R.; Detal, A. (1995) Astron. Astrophys. Suppl. Ser. 112, 125-142.] [Behrend, R. (2002) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Torppa, J.; Kaasalainen, M.; Michalowski, T.; Kwiatkowski, T.; et al. (2003) Icarus 164, 346-383.] [Hanus, J.; Durech, J.; Broz, M.; Warner, B.D.; et al. (2011) Astron. Astrophys. 530, A134.] [Hanus, J.; Marchis, F.; Durech, J. (2013) Icarus 226, 1045-1057.] [Shevchenko, V.G.; Velichko, F.P.; Checha, V.A.; Krugly, Y.N. (2014) Minor Planet Bull. 41, 195-198.] [Behrend, R. (2018) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] |
geometric albedo |
albedo |
0.1402 |
|
0.010 |
IRAS-A-FPA-3-RDR-IMPS-V6.0 |
IRAS observations used: 3 |
B-V |
BV |
0.674 |
|
0.021 |
EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 |
#obs=5; phase (min.=6.83, mean=7.96, max.=9.99) deg. |
U-B |
UB |
0.230 |
|
0.045 |
EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 |
#obs=5; phase (min.=6.83, mean=7.96, max.=9.99) deg. |
Tholen spectral type |
spec_T |
M |
|
n/a |
EAR-A-5-DDR-TAXONOMY-V4.0 |
used 7 color indices; used ground-based radiometric albedo |
SMASSII spectral type |
spec_B |
X |
|
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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69 Hesperia (A861 HC) Discovered 1861-Apr-29 by Schiaparelli, G. at Milan |
Reference: 20150829/MPCPages.arc | Last Updated: 2015-09-02 |
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Alternate Designations
A861 HC = 1932 CM1 = 1945 NB |
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