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129443 (1981 EP21)
Classification: Main-belt Asteroid          SPK-ID: 2129443
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 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2462817330448151 8.0543e-08  
a 2.545829525684303 2.1623e-08 au
q 1.918838218062113 2.0826e-07 au
i 11.39894288452427 6.3704e-06 deg
node 357.8758444850906 4.3098e-05 deg
peri 260.5894042410122 4.5238e-05 deg
M 172.2449777782975 2.3434e-05 deg
tp 2458290.617496183813
(2018-Jun-21.11749618)
9.0673e-05 TDB
period 1483.687389148523
4.06
1.8903e-05
5.175e-08
d
yr
n .2426387139453961 3.0913e-09 deg/d
Q 3.172820833306493 2.6949e-08 au
  Orbit Determination Parameters
   # obs. used (total)      267  
   data-arc span      14225 days (38.95 yr)  
   first obs. used      1981-02-13  
   last obs. used      2020-01-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49836  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-24 07:04:25  

Additional Information
 Earth MOID = .944143 au 
 Jupiter MOID = 2.05006 au 
 T_jup = 3.373 
[ 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 15.7   n/a MPO453773  

129443 (1981 EP21)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20060711/Numbers.arcLast Updated: 2006-07-17

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Alternate Designations
 1981 EP21 = 2002 OZ22 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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