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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 116 (heliocentric ecliptic J2000)
| Element | Value | Uncertainty (1-sigma) | Units |
| e | .07922951093182569 | 3.5424e-08 | |
| a | 2.702717682317449 | 7.114e-09 | au |
| q | 2.48858268216064 | 9.5341e-08 | au |
| i | 5.418467247542871 | 3.9944e-06 | deg |
| node | 136.0771220161525 | 4.0372e-05 | deg |
| peri | 188.8406349403369 | 4.7511e-05 | deg |
| M | 127.9077572259329 | 2.5937e-05 | deg |
| tp | 2458623.874512839306
(2019-May-20.37451284) | 0.00011653 | TDB |
| period | 1622.928740836077
4.44 | 6.4077e-06
1.754e-08 | d
yr |
| n | .2218211995029064 | 8.758e-10 | deg/d |
| Q | 2.916852682474258 | 7.6776e-09 | au |
|
| | Orbit Determination Parameters
Additional Information
|
[ show covariance matrix ]
Physical Parameter Table
| Parameter |
Symbol |
Value |
Units |
Sigma |
Reference |
Notes |
| absolute magnitude |
H |
7.63 |
|
n/a |
E2021B10 |
IRAS observations used: 25 |
| diameter |
diameter |
83.908 |
km |
2.091 |
urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M) |
|
| rotation period |
rot_per |
23.740 |
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.]
[Pilcher, F.; Higgins, D. (2011) Minor Planet Bull. 38, 32.]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.] |
| geometric albedo |
albedo |
0.217 |
|
0.024 |
urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M) |
|
| B-V |
BV |
0.853 |
|
0.012 |
EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 |
#obs=7; phase (min.=3.66, mean=7.54, max.=19.73) deg. |
| U-B |
UB |
0.441 |
|
0.015 |
EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 |
#obs=8; phase (min.=3.66, mean=9.26, max.=21.25) 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) |
|
| 103 Hera (A868 RA) Discovered 1868-Sep-07 by Watson, J. C. at Ann Arbor |
| Reference: DISCOVERY.DB | Last Updated: 2003-08-29 |
|
Alternate Designations
| A868 RA = 1927 CV = 1950 CM |
|
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