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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 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04807548466642345 4.3205e-08  
a 2.422261210706383 1.6461e-08 au
q 2.305809829012996 1.0066e-07 au
i 3.737630734613234 5.7282e-06 deg
node 187.8859662007633 6.8328e-05 deg
peri 101.6627061775696 0.00010257 deg
M 227.4898086049965 8.0977e-05 deg
tp 2457907.346753716151
(2017-Jun-02.84675372)
0.00031285 JED
period 1376.987154096697
3.77
1.4036e-05
3.843e-08
d
yr
n .2614403474491089 2.665e-09 deg/d
Q 2.53871259239977 1.7252e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1447  
   data-arc span      22770 days (62.34 yr)  
   first obs. used      1953-08-15  
   last obs. used      2015-12-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .45435  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Jan-04 13:21:48  

Additional Information
 Earth MOID = 1.29148 au 
 Jupiter MOID = 2.519 au 
 T_jup = 3.508 
[ 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  
rotation period rot_per 8.8068 h n/a LCDB (Rev. 2015-December); Warner et al., 2009 Result based on fragmentary lightcurve(s), may be completely wrong.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]

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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