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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 2456800.5 (2014-May-23.0) TDB
Reference: JPL 7 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03032775760425211 6.387e-08  
a 2.428538724179753 1.7295e-08 AU
q 2.35488659042029 1.5131e-07 AU
i 6.489510256271665 6.6569e-06 deg
node 300.361183066986 5.7403e-05 deg
peri 322.6895536586051 0.00016814 deg
M 186.2164360762817 0.00016551 deg
tp 2457467.801613350433
(2016-Mar-20.30161335)
0.00063906 JED
period 1382.343504657341
3.78
1.4767e-05
4.043e-08
d
yr
n .2604273097005926 2.782e-09 deg/d
Q 2.502190857939217 1.782e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      996  
   data-arc span      15045 days (41.19 yr)  
   first obs. used      1973-01-01  
   last obs. used      2014-03-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .55037  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Mar-22 11:01:07  

Additional Information
 Earth MOID = 1.34166 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 (809)
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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