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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 2456800.5 (2014-May-23.0) TDB
Reference: JPL 3 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2040142034706212 6.9023e-08  
a 2.144187229344172 1.0341e-08 AU
q 1.706742579657642 1.5024e-07 AU
i 2.484191378442516 7.1781e-06 deg
node 2.117899727225769 0.00010626 deg
peri 339.3913154254139 0.00010681 deg
M 300.9821732994806 1.3424e-05 deg
tp 2456988.506643711808
(2014-Nov-27.00664371)
4.324e-05 JED
period 1146.812675426002
3.14
8.2966e-06
2.271e-08
d
yr
n .3139135167530933 2.271e-09 deg/d
Q 2.581631879030701 1.2451e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1047  
   data-arc span      26893 days (73.63 yr)  
   first obs. used      1939-10-18  
   last obs. used      2013-06-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .55928  
   data source      ORB  
   producer      Otto Matic  
   solution date      2013-Aug-05 16:14:52  

Additional Information
 Earth MOID = .697518 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 (399)
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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