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8938 (1997 AF21)
Classification: Main-belt Asteroid          SPK-ID: 2008938
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 7 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2037249448862288 6.6028e-08  
a 2.144255099733153 1.0335e-08 au
q 1.707416847718001 1.4385e-07 au
i 2.484205740722379 6.6358e-06 deg
node 2.113965433469578 0.00010318 deg
peri 339.4132427443257 0.00010373 deg
M 129.3334040959327 1.3467e-05 deg
tp 2456988.477140307159
(2014-Nov-26.97714031)
4.1597e-05 JED
period 1146.867126294771
3.14
8.2916e-06
2.27e-08
d
yr
n .3138986127914103 2.2694e-09 deg/d
Q 2.581093351748304 1.2441e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1115  
   data-arc span      27821 days (76.17 yr)  
   first obs. used      1939-10-18  
   last obs. used      2015-12-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .52206  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Jan-04 13:08:50  

Additional Information
 Earth MOID = .697479 au 
 Jupiter MOID = 2.80229 au 
 T_jup = 3.682 
[ 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 14.6 mag n/a MPO263429  

8938 (1997 AF21)          Discovered 1997-Jan-09 by Ueda, S., Kaneda, H. at Kushiro
Reference: 19980610/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1997 AF21 = 1939 UD = 1942 RG = 1986 RX12 = 1986 SK2 = 1989 NS 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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