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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 10 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2376521073375148 6.4069e-08  
a 2.336058423325661 1.1324e-08 AU
q 1.780889216158765 1.5113e-07 AU
i 3.692774772319382 6.7709e-06 deg
node 346.3046658341224 7.7314e-05 deg
peri 323.0541150572296 7.7978e-05 deg
M 130.3872622736375 1.1333e-05 deg
tp 2456528.157914581234
(2013-Aug-23.65791458)
3.9351e-05 JED
period 1304.13928312947
3.57
9.4829e-06
2.596e-08
d
yr
n .2760441347461968 2.0072e-09 deg/d
Q 2.891227630492556 1.4015e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      921  
   data-arc span      12208 days (33.42 yr)  
   first obs. used      1981-08-23  
   last obs. used      2015-01-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .48985  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Mar-09 14:30:04  

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
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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