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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04292413575026788 3.6771e-08  
a 3.234325202959976 1.7072e-08 au
q 3.095494588887609 1.1881e-07 au
i 10.20806520974173 3.8933e-06 deg
node 77.4154227308894 2.3072e-05 deg
peri 282.2315154265748 5.2001e-05 deg
M 31.22995800878695 4.577e-05 deg
tp 2458816.192565550987
0.00027042 TDB
period 2124.584233605956
n .1694449174128479 1.3416e-09 deg/d
Q 3.373155817032342 1.7805e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2882  
   data-arc span      21152 days (57.91 yr)  
   first obs. used      1962-12-03  
   last obs. used      2020-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44074  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:09:29  

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. 2019-August); 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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1927-Jun-16 19:23 00:02 Europ 0.041107510697317 0.0410925382432991 0.041122483177329 3.83261399303882 3.83261392557741 2425048.307483280 1.91464851100522 747.959993551327 49.4721888830729 4.01568129576802 11949.2857832412 T 39 CATAB v2.0f-lin.ifort 2020-Nov-13 04:09:37 2020-Nov-13 04:09

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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