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12987 (1981 EF2)
Classification: Main-belt Asteroid          SPK-ID: 2012987
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02968656406924377 4.7603e-08  
a 2.427857652269912 1.6262e-08 au
q 2.355782900524798 1.2091e-07 au
i 6.487185881518775 5.9379e-06 deg
node 300.3457694415068 5.1004e-05 deg
peri 324.2665360900045 0.00015737 deg
M 340.8488857481351 0.00015355 deg
tp 2457474.006340725304
(2016-Mar-26.50634073)
0.00058963 JED
period 1381.762038129589
3.78
1.3883e-05
3.801e-08
d
yr
n .2605369014821908 2.6177e-09 deg/d
Q 2.499932404015027 1.6745e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1118  
   data-arc span      15447 days (42.29 yr)  
   first obs. used      1973-01-01  
   last obs. used      2015-04-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .49937  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jun-04 16:16:29  

Additional Information
 Earth MOID = 1.3411 au 
 Jupiter MOID = 2.53967 au 
 T_jup = 3.500 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.5 mag n/a PDS3 (MPC 37483)  

12987 (1981 EF2)          Discovered 1981-Mar-05 by Debehogne, H., DeSanctis, G. at La Silla
Reference: 20000124/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1981 EF2 = 1973 AO1 = 1986 RM3 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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