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12212 (1981 QR2)
Classification: Main-belt Asteroid          SPK-ID: 2012212
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 6 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2378667972195641 7.0464e-08  
a 2.335424430740257 7.3804e-09 AU
q 1.779904501251748 1.652e-07 AU
i 3.692737383762867 7.7155e-06 deg
node 346.3126071497005 8.041e-05 deg
peri 322.9876619110454 8.124e-05 deg
M 75.21682498156029 1.2223e-05 deg
tp 2456528.129761019487
(2013-Aug-23.62976102)
4.367e-05 JED
period 1303.608415497769
3.57
6.1795e-06
1.692e-08
d
yr
n .2761565480248437 1.3091e-09 deg/d
Q 2.890944360228765 9.1359e-09 AU
  Orbit Determination Parameters
   # obs. used (total)      836  
   data-arc span      11825 days (32.38 yr)  
   first obs. used      1981-08-23  
   last obs. used      2014-01-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .52501  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jan-22 02:47:35  

Additional Information
 Earth MOID = .76624 AU 
 T_jup = 3.527 
[ 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 14.7 mag n/a PDS3 (MPC 36662)  

12212 (1981 QR2)          Discovered 1981-Aug-23 by Debehogne, H. at La Silla (809)
Reference: 19991123/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1981 QR2 = 1998 FN28 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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