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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 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2366717340669446 6.3631e-08  
a 2.337538400721272 1.1524e-08 au
q 1.784309133974496 1.4995e-07 au
i 3.692531372589229 6.7024e-06 deg
node 346.2974303615891 7.7167e-05 deg
peri 323.2461542734555 7.783e-05 deg
M 240.4502080251138 1.1831e-05 deg
tp 2457833.993791651470
(2017-Mar-21.49379165)
4.48e-05 JED
period 1305.378808415762
3.57
9.6532e-06
2.643e-08
d
yr
n .2757820164377454 2.0394e-09 deg/d
Q 2.890767667468047 1.4251e-08 au
  Orbit Determination Parameters
   # obs. used (total)      928  
   data-arc span      12535 days (34.32 yr)  
   first obs. used      1981-08-23  
   last obs. used      2015-12-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .49339  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Jan-04 13:20:05  

Additional Information
 Earth MOID = .769666 au 
 Jupiter MOID = 2.3784 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 14.8 mag n/a MPO332934  

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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