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2421 Nininger (1979 UD)
Classification: Outer Main-belt Asteroid          SPK-ID: 2002421
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04292413779107357 3.6288e-08  
a 3.234325202140107 1.6899e-08 au
q 3.095494581502303 1.1684e-07 au
i 10.20806525097164 3.8918e-06 deg
node 77.41542437046638 2.2559e-05 deg
peri 282.2315135197519 5.1783e-05 deg
M 31.22995856402758 4.5736e-05 deg
tp 2458816.192562344246
0.00027022 TDB
period 2124.584232798115
n .1694449174772768 1.328e-09 deg/d
Q 3.37315582277791 1.7625e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2916  
   data-arc span      21168 days (57.95 yr)  
   first obs. used      1962-12-03  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43844  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 02:06:14  

Additional Information
 Earth MOID = 2.11459 au 
 Jupiter MOID = 1.87358 au 
 T_jup = 3.159 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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] (  
rotation period rot_per 6.4058 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Behrend, R. (2015) Observatoire de Geneve web site,]
[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] (  

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 6531Last Updated: 2006-03-21

[ show close-approach data ]
Alternate Designations
 1979 UD = 1932 RP = 1962 XJ1 = 1971 HH 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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