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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 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 8 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2376520928140377 6.4772e-08  
a 2.33605842593528 1.1452e-08 AU
q 1.780889252075894 1.5295e-07 AU
i 3.692774733482954 7.0186e-06 deg
node 346.3046658401051 7.7338e-05 deg
peri 323.0541104422113 7.8053e-05 deg
M 130.3872643128747 1.141e-05 deg
tp 2456528.157906402392
(2013-Aug-23.65790640)
3.9709e-05 JED
period 1304.139285314758
3.57
9.5896e-06
2.625e-08
d
yr
n .276044134283642 2.0298e-09 deg/d
Q 2.891227599794666 1.4173e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      839  
   data-arc span      12109 days (33.15 yr)  
   first obs. used      1981-08-23  
   last obs. used      2014-10-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .50837  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Nov-10 13:16:47  

Additional Information
 Earth MOID = .76914 AU 
 T_jup = 3.526 
[ 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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