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7521 (1990 QS2)
Classification: Main-belt Asteroid          SPK-ID: 2007521
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 9 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .008853614643560133 6.2452e-08  
a 2.901809110879134 2.7287e-08 AU
q 2.876117611242238 1.7759e-07 AU
i 2.649288335539441 5.7266e-06 deg
node 143.2662510451553 0.00013909 deg
peri 12.42864939780767 0.00036693 deg
M 165.3073519213311 0.0003382 deg
tp 2456171.429705058272
(2012-Aug-31.92970506)
0.0016977 JED
period 1805.517435915737
4.94
2.5467e-05
6.972e-08
d
yr
n .1993888249644137 2.8124e-09 deg/d
Q 2.92750061051603 2.7529e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1145  
   data-arc span      11442 days (31.33 yr)  
   first obs. used      1983-04-16  
   last obs. used      2014-08-13  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .4994  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Sep-12 13:51:54  

Additional Information
 Earth MOID = 1.88341 AU 
 T_jup = 3.285 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.9 mag n/a MPO267738  

7521 (1990 QS2)          Discovered 1990-Aug-24 by Holt, H. E. at Palomar (675)
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1990 QS2 = 1983 HQ1 = 1985 SB4 = 1986 WC7 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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