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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 2 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04881433522612496 4.8961e-08  
a 2.421053587135301 1.688e-08 AU
q 2.302871465732466 1.1927e-07 AU
i 3.736578445044074 6.882e-06 deg
node 187.9127078204672 7.9265e-05 deg
peri 101.793530120037 0.0001092 deg
M 70.36641818358888 7.5557e-05 deg
tp 2456531.552213502287
(2013-Aug-27.05221350)
0.00028804 JED
period 1375.957532562848
3.77
1.439e-05
3.94e-08
d
yr
n .2616359818383832 2.7362e-09 deg/d
Q 2.539235708538136 1.7704e-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      .48903  
   data source      ORB  
   producer      Otto Matic  
   solution date      2013-Aug-05 17:21:46  

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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