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2113 Ehrdni (1972 RJ2)
Classification: Main-belt Asteroid          SPK-ID: 2002113
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0964850458008545 6.7144e-08  
a 2.473749569946028 1.0302e-08 au
q 2.235069729389942 1.6031e-07 au
i 6.430692215706843 4.4833e-06 deg
node 23.35307914041671 2.8141e-05 deg
peri 348.7153683278283 3.3474e-05 deg
M 90.88345645029675 1.8806e-05 deg
tp 2458641.731455007953
(2019-Jun-07.23145501)
7.3567e-05 TDB
period 1421.12416540596
3.89
8.8771e-06
2.43e-08
d
yr
n .2533205815250928 1.5824e-09 deg/d
Q 2.712429410502115 1.1296e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2469  
   data-arc span      22955 days (62.85 yr)  
   first obs. used      1958-01-11  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42608  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 02:04:27  

Additional Information
 Earth MOID = 1.23577 au 
 Jupiter MOID = 2.71963 au 
 T_jup = 3.467 
[ 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 12.7   n/a MPO502173  
diameter diameter 7.043 km 2.082 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  
rotation period rot_per 13.2 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on fragmentary lightcurve(s), may be completely wrong.
Published Reference List:
[Binzel, R.P. (1987) Icarus 72, 135-208.]
geometric albedo albedo 0.238   0.157 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  
B-V BV 0.840   0.030 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=3.29 deg.

2113 Ehrdni           Discovered 1972 Sept. 11 by N. S. Chernykh at the Crimean Astrophysical Observatory.
Named in memory of Ehrdni Tel'dzhievich Delikov (1922-1942), a hero from the Kalmyk S.S.R. who was killed in the Great Patriotic War (1941-1945).
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC 5283Last Updated: 2007-10-23

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Alternate Designations
 1972 RJ2 = 1958 AA = 1976 UQ2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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