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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 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2366272481960655 5.5184e-08  
a 2.336492307464932 1.0983e-08 au
q 1.78361456231823 1.3183e-07 au
i 3.691569538996843 6.3315e-06 deg
node 346.2911114674101 6.5766e-05 deg
peri 323.3663454646459 6.6547e-05 deg
M 295.486842776045 1.2069e-05 deg
tp 2457834.271065241437
(2017-Mar-21.77106524)
4.474e-05 JED
period 1304.502633389455
3.57
9.1981e-06
2.518e-08
d
yr
n .275967246662141 1.9459e-09 deg/d
Q 2.889370052611634 1.3582e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1075  
   data-arc span      12655 days (34.65 yr)  
   first obs. used      1981-08-23  
   last obs. used      2016-04-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .49277  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Apr-25 13:13:38  

Additional Information
 Earth MOID = .770437 au 
 Jupiter MOID = 2.3814 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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