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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 2456800.5 (2014-May-23.0) TDB
Reference: JPL 4 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07756163311660641 6.0965e-08  
a 2.461595002816507 1.8414e-08 AU
q 2.270669674326381 1.4934e-07 AU
i 5.26588865802516 7.3212e-06 deg
node 216.4419776260098 6.0806e-05 deg
peri 302.2612225038339 7.6876e-05 deg
M 145.4995461744728 4.7088e-05 deg
tp 2456230.358745195305
(2012-Oct-29.85874520)
0.00018395 JED
period 1410.663174739857
3.86
1.5829e-05
4.334e-08
d
yr
n .2551991194257894 2.8635e-09 deg/d
Q 2.652520331306633 1.9842e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1197  
   data-arc span      15862 days (43.43 yr)  
   first obs. used      1970-02-01  
   last obs. used      2013-07-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .52718  
   data source      ORB  
   producer      Otto Matic  
   solution date      2013-Aug-05 15:44:18  

Additional Information
 Earth MOID = 1.28424 AU 
 T_jup = 3.479 
[ 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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