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7540 (1997 AK21)
Classification: Main-belt Asteroid          SPK-ID: 2007540
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 9 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07767833857480468 5.7164e-08  
a 2.461343558315319 1.8043e-08 AU
q 2.270150480043587 1.3853e-07 AU
i 5.266231053473471 6.1908e-06 deg
node 216.4345615613921 5.948e-05 deg
peri 302.306789753506 7.1726e-05 deg
M 196.4967370320942 4.2197e-05 deg
tp 2457641.090813667913
(2016-Sep-09.59081367)
0.00016728 JED
period 1410.44703778001
3.86
1.5509e-05
4.246e-08
d
yr
n .2552382261489424 2.8066e-09 deg/d
Q 2.652536636587051 1.9445e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1233  
   data-arc span      16272 days (44.55 yr)  
   first obs. used      1970-02-01  
   last obs. used      2014-08-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .48346  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Sep-12 13:51:55  

Additional Information
 Earth MOID = 1.2842 AU 
 T_jup = 3.480 
[ 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 13.2 mag n/a MPO265998  

7540 (1997 AK21)          Discovered 1997-Jan-09 by Ueda, S., Kaneda, H. at Kushiro (399)
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1997 AK21 = 1970 CO = 1976 UL2 = 1979 OW11 = 1986 HE = 1987 QX12 = 1992 WA9 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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