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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 9 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04876244534149865 4.4179e-08  
a 2.420824802569189 1.6787e-08 AU
q 2.302779465452564 1.027e-07 AU
i 3.73675299073939 5.8842e-06 deg
node 187.9136923786147 6.932e-05 deg
peri 101.672261202335 0.00010253 deg
M 122.8255687836288 7.9299e-05 deg
tp 2456531.114412482620
(2013-Aug-26.61441248)
0.00030032 JED
period 1375.762499451007
3.77
1.431e-05
3.918e-08
d
yr
n .2616730723098331 2.7218e-09 deg/d
Q 2.538870139685813 1.7606e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1399  
   data-arc span      22486 days (61.56 yr)  
   first obs. used      1953-08-15  
   last obs. used      2015-03-09  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .45216  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Apr-07 16:44:55  

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 13.7 mag n/a MPO324426  
rotation period rot_per 8.8068 h n/a LCDB (Rev. 2015-July); 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., in press.]

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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