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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 2456400.5 (2013-Apr-18.0) TDB
Reference: JPL 1 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2041322472634717 6.9108e-08  
a 2.143669908979839 1.0408e-08 AU
q 1.706077753068703 1.5042e-07 AU
i 2.484553104378479 7.1976e-06 deg
node 2.12250556846352 0.00010716 deg
peri 339.4585048818678 0.00010773 deg
M 175.3106011091144 1.3188e-05 deg
tp 2455842.234265193438
(2011-Oct-07.73426519)		 4.1117e-05 JED
period 1146.397669387226
3.14		 8.3488e-06
2.286e-08		 d
yr
n .3140271562069972 2.2869e-09 deg/d
Q 2.581262064890975 1.2532e-08 AU
   Orbit Determination Parameters
   # obs. used (total)      1032  
   data-arc span      26839 days (73.48 yr)  
   first obs. used      1939-10-18  
   last obs. used      2013-04-11  
   planetary ephem.      DE405  
   SB-pert. ephem.      SB405-CPV-2  
   condition code      0  
   fit RMS      .5615  
   data source      ORB  
   producer      Otto Matic  
   solution date      2013-Apr-29 13:33:24  

Additional Information
 Earth MOID = .697787 AU 
 T_jup = 3.683 
[ 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 31932)  

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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