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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 4 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04876243121883191 4.6565e-08  
a 2.420824810509289 1.8776e-08 AU
q 2.302779507193987 1.1158e-07 AU
i 3.736753556019761 6.8971e-06 deg
node 187.9136858883313 7.4077e-05 deg
peri 101.6722531660118 0.00010742 deg
M 122.8255786065209 8.0349e-05 deg
tp 2456531.114372634506
(2013-Aug-26.61437263)
0.00030476 JED
period 1375.762506219583
3.77
1.6006e-05
4.382e-08
d
yr
n .2616730710224349 3.0444e-09 deg/d
Q 2.53887011382459 1.9692e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1156  
   data-arc span      22298 days (61.05 yr)  
   first obs. used      1953-08-15  
   last obs. used      2014-09-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .46914  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Sep-12 14:00:40  

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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