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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 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04778613853450062 3.6966e-08  
a 2.421833618061471 1.4485e-08 au
q 2.306103541281275 8.9139e-08 au
i 3.739410883569579 5.4886e-06 deg
node 187.8792945772121 6.092e-05 deg
peri 102.0089555584101 9.7871e-05 deg
M 279.4028485828678 8.1035e-05 deg
tp 2457908.699602234197
(2017-Jun-04.19960223)
0.00031159 JED
period 1376.622558656911
3.77
1.235e-05
3.381e-08
d
yr
n .2615095893468656 2.3461e-09 deg/d
Q 2.537563694841668 1.5177e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1598  
   data-arc span      22890 days (62.67 yr)  
   first obs. used      1953-08-15  
   last obs. used      2016-04-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .45046  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Apr-25 13:14:54  

Additional Information
 Earth MOID = 1.29322 au 
 Jupiter MOID = 2.52113 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  
rotation period rot_per 8.8068 h n/a LCDB (Rev. 2016-February); 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. (2016) 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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