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

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .01194909875367234 3.6567e-08  
a 2.899656423025149 1.3219e-08 au
q 2.865008142074701 1.0436e-07 au
i 2.650845874094093 3.7126e-06 deg
node 143.1446457141485 8.7646e-05 deg
peri 13.44217316271458 0.00018322 deg
M 203.1740934865531 0.00016122 deg
tp 2459786.158015294663
(2022-Jul-25.65801529)
0.00080814 TDB
period 1803.508691861617
4.94
1.2333e-05
3.377e-08
d
yr
n .1996109038035192 1.365e-09 deg/d
Q 2.934304703975597 1.3377e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2107  
   data-arc span      13359 days (36.57 yr)  
   first obs. used      1983-04-16  
   last obs. used      2019-11-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51428  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 18:31:43  

Additional Information
 Earth MOID = 1.87206 au 
 Jupiter MOID = 2.02674 au 
 T_jup = 3.286 
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Orbital Elements at Epoch 2456390.5 (2013-Apr-08.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .008591350839171393 3.6093e-08  
q 2.875883777673084 1.0253e-07 au
tp 2456158.069429463252
(2012-Aug-18.56942946)
0.0011456 TDB
node 143.278705182087 8.776e-05 deg
peri 9.740928278372209 0.00024479 deg
i 2.64902433623811 3.7121e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2107  
   data-arc span      13359 days (36.57 yr)  
   first obs. used      1983-04-16  
   last obs. used      2019-11-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51428  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 18:31:43  

Additional Information
 Jupiter MOID = 2.02674 au 
 T_jup = 3.286 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.302680211643131E-15 -3.671102772907035E-15 1.341079845578541E-11 -1.642553149411352E-15 2.68889529184596E-12 1.296274821082233E-16
q -3.671102772907035E-15 1.051208081019081E-14 -3.768541421814135E-11 3.349181546812909E-15 -7.551983648807338E-12 -3.001035908934239E-16
tp 1.341079845578541E-11 -3.768541421814135E-11 1.312410824087157E-6 -3.058418611684536E-11 2.61815661276594E-7 2.362900345263444E-12
node -1.642553149411352E-15 3.349181546812909E-15 -3.058418611684536E-11 7.701833253235438E-9 -7.699488659938034E-9 9.3712020494792E-11
peri 2.68889529184596E-12 -7.551983648807338E-12 2.61815661276594E-7 -7.699488659938034E-9 5.9922433254276E-8 -9.31370402979044E-11
i 1.296274821082233E-16 -3.001035908934239E-16 2.362900345263444E-12 9.3712020494792E-11 -9.31370402979044E-11 1.37794608083886E-11

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.9   n/a MPO435771  
diameter diameter 7.612 km 0.188 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.254   0.048 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

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

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Alternate Designations
 1990 QS2 = 1983 HQ1 = 1985 SB4 = 1986 WC7 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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