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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 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 8 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04876244668521386 4.4191e-08  
a 2.42082480168817 1.6799e-08 AU
q 2.302779461361607 1.0275e-07 AU
i 3.736753125103149 5.9109e-06 deg
node 187.913692037418 6.9329e-05 deg
peri 101.6722658905571 0.00010258 deg
M 122.8255649971994 7.9341e-05 deg
tp 2456531.114427208934
(2013-Aug-26.61442721)
0.00030048 JED
period 1375.762498699979
3.77
1.432e-05
3.921e-08
d
yr
n .2616730724526803 2.7238e-09 deg/d
Q 2.538870142014733 1.7618e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1368  
   data-arc span      22469 days (61.52 yr)  
   first obs. used      1953-08-15  
   last obs. used      2015-02-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .452  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Mar-09 14:32:11  

Additional Information
 Earth MOID = 1.29144 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 13.7 mag n/a MPO324426  

12731 (1991 RW12)          Discovered 1991-Sep-10 by Holt, H. E. at Palomar
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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