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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 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02984852599714368 5.1873e-08  
a 2.429224698763964 1.8133e-08 AU
q 2.356715922190004 1.2834e-07 AU
i 6.488536331180508 6.139e-06 deg
node 300.3608852298594 5.3437e-05 deg
peri 323.0604003537651 0.00016283 deg
M 237.8725506190972 0.00015997 deg
tp 2457469.648946297460
(2016-Mar-22.14894630)
0.00061696 JED
period 1382.92923927629
3.79
1.5484e-05
4.239e-08
d
yr
n .2603170066665118 2.9147e-09 deg/d
Q 2.501733475337923 1.8674e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1032  
   data-arc span      15364 days (42.06 yr)  
   first obs. used      1973-01-01  
   last obs. used      2015-01-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .5071  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Feb-04 13:36:26  

Additional Information
 Earth MOID = 1.34523 AU 
 T_jup = 3.499 
[ 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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