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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.
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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
| Element | Value | Uncertainty (1-sigma) | Units |
| e | .04292414105837705 | 3.8587e-08 | |
| a | 3.234325201011587 | 1.7736e-08 | au |
| q | 3.095494569854703 | 1.2616e-07 | au |
| i | 10.20806532927481 | 3.9185e-06 | deg |
| node | 77.41542368171932 | 2.4644e-05 | deg |
| peri | 282.2315132784361 | 5.2734e-05 | deg |
| M | 31.22995982171723 | 4.6025e-05 | deg |
| tp | 2458816.192555018299
(2019-Nov-28.69255502) | 0.00027188 | TDB |
| period | 2124.584231686152
5.82 | 1.7476e-05
4.785e-08 | d
yr |
| n | .1694449175659608 | 1.3938e-09 | deg/d |
| Q | 3.373155832168473 | 1.8497e-08 | au |
|
| | Orbit Determination Parameters
Additional Information
|
[ show covariance matrix ]
Physical Parameter Table
| Parameter |
Symbol |
Value |
Units |
Sigma |
Reference |
Notes |
| absolute magnitude |
H |
10.7 |
|
n/a |
MPO416733 |
|
| diameter |
diameter |
39.505 |
km |
0.438 |
urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M) |
|
| rotation period |
rot_per |
6.4058 |
h |
n/a |
LCDB (Rev. 2019-August); Warner et al., 2009 |
Published Reference List:
[Behrend, R. (2015) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.] |
| geometric albedo |
albedo |
0.064 |
|
0.012 |
urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M) |
|
|
| 2421 Nininger | Discovered 1979 Oct. 17 by E. Bowell at the Anderson Mesa station of the Lowell Observatory. |
| Named on the occasion of the 95th birthday, 1982 Jan. 17, of Harvey Harlow Nininger, celebrated U.S. meteoriticist. Through field investigations and publicity he was responsible for the recovery of some 200 separate meteorite falls and finds, and his resulting 3000 samples are more than those of any other individual prior to the exploration of the Antarctic blue-ice fields. The author of many popular and technical works, he conducted much of his research at the Arizona meteorite crater, not far from Flagstaff. Name proposed by N. Sperling. |
| NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) |
| Reference: MPC 6531 | Last Updated: 2006-03-21 |
|
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Alternate Designations
| 1979 UD = 1932 RP = 1962 XJ1 = 1971 HH |
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