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21131 (1993 FQ7)
Classification: Main-belt Asteroid          SPK-ID: 2021131
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03843216337150671 5.4405e-08  
a 3.010016229665491 2.2824e-08 au
q 2.894334794176101 1.5694e-07 au
i 10.83556277768481 7.2026e-06 deg
node 20.38359444105473 2.2944e-05 deg
peri 123.286532694839 8.7633e-05 deg
M 153.4632424726709 8.311e-05 deg
tp 2458387.382043299745
(2018-Sep-25.88204330)
0.0004402 TDB
period 1907.44350044748
5.22
2.1696e-05
5.94e-08
d
yr
n .1887342927408047 2.1467e-09 deg/d
Q 3.125697665154882 2.3702e-08 au
  Orbit Determination Parameters
   # obs. used (total)      865  
   data-arc span      10892 days (29.82 yr)  
   first obs. used      1990-09-25  
   last obs. used      2020-07-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .58786  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 01:58:45  

Additional Information
 Earth MOID = 1.91801 au 
 Jupiter MOID = 1.86369 au 
 T_jup = 3.222 
[ show covariance matrix ]

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 14.2   n/a MPO302194  
diameter diameter 4.724 km 0.680 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.199   0.091 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21131 (1993 FQ7)          Discovered 1993-Mar-17 by UESAC at La Silla
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1993 FQ7 = 1990 SG24 = 1993 HH9 = 2000 QE223 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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