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21907 (1999 VM20)
Classification: Main-belt Asteroid          SPK-ID: 2021907
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1253551125170252 1.4536e-08  
a 2.669887530205985 1.1903e-08 au
q 2.335203478449211 4.3196e-08 au
i 12.73817126718153 3.6446e-07 deg
node 319.6952530086047 3.9269e-06 deg
peri 141.204956681051 1.0866e-05 deg
M 248.2583750917891 1.1714e-05 deg
tp 2459695.095725836233
(2022-Apr-25.59572584)
5.3496e-05 TDB
period 1593.447933545849
4.36
1.0656e-05
2.917e-08
d
yr
n .2259251729668402 1.5109e-09 deg/d
Q 3.004571581962759 1.3395e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2612  
   data-arc span      13894 days (38.04 yr)  
   first obs. used      1982-12-23  
   last obs. used      2021-01-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .39261  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Mar-17 03:05:33  

Additional Information
 Earth MOID = 1.36514 au 
 Jupiter MOID = 2.12839 au 
 T_jup = 3.335 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.44   n/a E2021B10  
diameter diameter 6.633 km 0.099 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.278   0.037 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21907 (1999 VM20)          Discovered 1999-Nov-11 by Juels, C. W. at Fountain Hills
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 VM20 = 1982 YK1 = 1986 TJ11 = 2001 AL17 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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