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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 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02984849765369214 4.8136e-08  
a 2.429224688560057 1.6687e-08 AU
q 2.356715981143281 1.2193e-07 AU
i 6.488534194887702 5.9966e-06 deg
node 300.3609060996211 5.1252e-05 deg
peri 323.0603290974965 0.00015737 deg
M 237.8726081406373 0.00015331 deg
tp 2457469.648722374209
(2016-Mar-22.14872237)
0.00059086 JED
period 1382.929230562843
3.79
1.4249e-05
3.901e-08
d
yr
n .2603170083066958 2.6822e-09 deg/d
Q 2.501733395976833 1.7185e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1087  
   data-arc span      15422 days (42.22 yr)  
   first obs. used      1973-01-01  
   last obs. used      2015-03-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .50456  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Apr-07 16:45:39  

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
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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