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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 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .008853628061882137 6.2047e-08  
a 2.901809123342748 2.6208e-08 AU
q 2.876117584658095 1.7685e-07 AU
i 2.64928828966024 5.7077e-06 deg
node 143.266287736879 0.00013785 deg
peri 12.42855723713306 0.00036365 deg
M 165.3074038570664 0.00033542 deg
tp 2456171.429439242183
(2012-Aug-31.92943924)
0.0016833 JED
period 1805.517447548104
4.94
2.446e-05
6.697e-08
d
yr
n .1993888236798158 2.7012e-09 deg/d
Q 2.9275006620274 2.644e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1173  
   data-arc span      11810 days (32.33 yr)  
   first obs. used      1983-04-16  
   last obs. used      2015-08-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .50249  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Sep-02 14:22:16  

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
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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