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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 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .009025976915841793 5.7072e-08  
a 2.901046737102835 1.9994e-08 au
q 2.874861956221966 1.6538e-07 au
i 2.649438358721419 5.1761e-06 deg
node 143.2685199026769 0.00013119 deg
peri 14.09736107768085 0.00033436 deg
M 243.3880378553835 0.00030771 deg
tp 2457985.116565696475
(2017-Aug-19.61656570)
0.0015431 JED
period 1804.805954553156
4.94
1.8659e-05
5.109e-08
d
yr
n .1994674270060965 2.0621e-09 deg/d
Q 2.927231517983703 2.0175e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1337  
   data-arc span      11922 days (32.64 yr)  
   first obs. used      1983-04-16  
   last obs. used      2015-12-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .50284  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Jan-04 13:03:58  

Additional Information
 Earth MOID = 1.88045 au 
 Jupiter MOID = 2.03447 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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