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12731 (1991 RW12)
Classification: Main-belt Asteroid          SPK-ID: 2012731
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 3 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04881435511758109 4.6736e-08  
a 2.421053590662867 1.8956e-08 AU
q 2.302871420929555 1.1219e-07 AU
i 3.736579089287203 6.911e-06 deg
node 187.9127149610948 7.441e-05 deg
peri 101.7935019165854 0.00010759 deg
M 70.36643307454021 7.9991e-05 deg
tp 2456531.552155999718
(2013-Aug-27.05215600)
0.00030443 JED
period 1375.957535570081
3.77
1.616e-05
4.424e-08
d
yr
n .2616359812665631 3.0728e-09 deg/d
Q 2.539235760396179 1.9882e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1148  
   data-arc span      21878 days (59.90 yr)  
   first obs. used      1953-08-15  
   last obs. used      2013-07-09  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .47025  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jun-09 20:27:17  

Additional Information
 Earth MOID = 1.28962 AU 
 T_jup = 3.509 
[ 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 MPO266026  

12731 (1991 RW12)          Discovered 1991-Sep-10 by Holt, H. E. at Palomar (675)
Reference: 19991222/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1991 RW12 = 1953 PK1 = 1976 SO9 = 1998 MG26 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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