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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 40 (heliocentric ecliptic J2000)
| Element | Value | Uncertainty (1-sigma) | Units |
| e | .1174372771649237 | 2.9052e-08 | |
| a | 3.11161916583062 | 1.2718e-08 | au |
| q | 2.746199083421281 | 9.2034e-08 | au |
| i | 12.53631215879886 | 3.3812e-06 | deg |
| node | 147.8653341268094 | 1.4713e-05 | deg |
| peri | 356.4336368410893 | 2.0673e-05 | deg |
| M | 219.3992611575628 | 1.5799e-05 | deg |
| tp | 2459783.502566757310
(2022-Jul-23.00256676) | 9.0219e-05 | TDB |
| period | 2004.832452185892
5.49 | 1.2292e-05
3.365e-08 | d
yr |
| n | .1795661276369942 | 1.1009e-09 | deg/d |
| Q | 3.477039248239959 | 1.4212e-08 | au |
|
| | Orbit Determination Parameters
Additional Information
|
[ show covariance matrix ]
Physical Parameter Table
| Parameter |
Symbol |
Value |
Units |
Sigma |
Reference |
Notes |
| absolute magnitude |
H |
10.9 |
|
n/a |
MPO431517 |
|
| diameter |
diameter |
38.277 |
km |
0.400 |
urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M) |
|
| rotation period |
rot_per |
15.63 |
h |
n/a |
LCDB (Rev. 2020-October); Warner et al., 2009 |
Published Reference List:
[Menke, J.; Cooney, W.; Gross, J.; Terrell, D. (2008) Minor Planet Bull. 35, 155-160.] |
| geometric albedo |
albedo |
0.053 |
|
0.005 |
urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M) |
|
|
| 1999 Hirayama (1973 DR) Discovered 1973-Feb-27 by Kohoutek, L. at Bergedorf |
| Reference: DISCOVERY.DB | Last Updated: 2003-08-29 |
|
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Alternate Designations
| 1973 DR = 1935 GF = 1940 EH = 1951 EY1 = 1951 FA = 1965 UF = 1969 NB = 1975 NE |
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