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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 5 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04876243126411524 4.5632e-08  
a 2.420824810490338 1.8006e-08 AU
q 2.302779507066338 1.0813e-07 AU
i 3.736752801295748 6.6972e-06 deg
node 187.9136937507291 7.2315e-05 deg
peri 101.6722453217219 0.00010568 deg
M 122.8255786133041 8.0027e-05 deg
tp 2456531.114372614096
(2013-Aug-26.61437261)
0.00030337 JED
period 1375.762506203429
3.77
1.535e-05
4.203e-08
d
yr
n .2616730710255074 2.9195e-09 deg/d
Q 2.538870113914339 1.8884e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1177  
   data-arc span      22361 days (61.22 yr)  
   first obs. used      1953-08-15  
   last obs. used      2014-11-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .4692  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Nov-10 13:18:07  

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 13.5 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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