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20021 (1991 VM6)
Classification: Main-belt Asteroid          SPK-ID: 2020021
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 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06941548925443201 2.07e-08  
a 2.613583328310093 1.154e-08 au
q 2.432160162868221 5.4569e-08 au
i 15.71078508329052 3.0906e-07 deg
node 89.3695110462297 1.7495e-06 deg
peri 102.7051340612699 2.0906e-05 deg
M 190.0595110646024 2.1768e-05 deg
tp 2459929.029792125390
(2022-Dec-15.52979213)
9.5442e-05 TDB
period 1543.309230237898
4.23
1.0221e-05
2.798e-08
d
yr
n .2332649821218959 1.5449e-09 deg/d
Q 2.795006493751965 1.2341e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2053  
   data-arc span      10714 days (29.33 yr)  
   first obs. used      1991-11-06  
   last obs. used      2021-03-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44403  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:11:31  

Additional Information
 Earth MOID = 1.47783 au 
 Jupiter MOID = 2.31581 au 
 T_jup = 3.352 
[ 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 13.34   n/a E2021B10  
diameter diameter 5.592 km 0.099 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.356   0.057 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20021 (1991 VM6)          Discovered 1991-Nov-06 by Elst, E. W. at La Silla
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1991 VM6 = 1999 SP20 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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