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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06859469814865223 3.835e-08  
a 2.615926437015929 1.321e-08 au
q 2.436487752689742 1.0279e-07 au
i 15.71042113416985 5.3922e-06 deg
node 89.37559286781426 1.5933e-05 deg
peri 103.5281051150797 4.3934e-05 deg
M 49.39707454076324 4.0128e-05 deg
tp 2458388.451382248340
(2018-Sep-26.95138225)
0.00017224 TDB
period 1545.385088090643
4.23
1.1706e-05
3.205e-08
d
yr
n .2329516460164553 1.7646e-09 deg/d
Q 2.795365121342116 1.4116e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1586  
   data-arc span      10151 days (27.79 yr)  
   first obs. used      1991-11-06  
   last obs. used      2019-08-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45199  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Sep-24 01:29:02  

Additional Information
 Earth MOID = 1.48199 au 
 Jupiter MOID = 2.31559 au 
 T_jup = 3.351 
[ 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 13.3   n/a MPO449098  
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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