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JPL Small-Body Database Browser
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20918 (6539 P-L)
Classification: Main-belt Asteroid          SPK-ID: 2020918
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06828621065051875 3.9904e-08  
a 2.667949474029172 1.4121e-08 au
q 2.485765314240675 1.0386e-07 au
i 7.785543476794126 5.2668e-06 deg
node 170.0434178513718 2.9294e-05 deg
peri 121.803346888029 5.0468e-05 deg
M 220.4730313278652 4.3543e-05 deg
tp 2459217.408119026249
(2021-Jan-02.90811903)
0.00019437 TDB
period 1591.713236251243
4.36
1.2637e-05
3.46e-08
d
yr
n .226171393063151 1.7957e-09 deg/d
Q 2.850133633817669 1.5085e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1343  
   data-arc span      24736 days (67.72 yr)  
   first obs. used      1951-08-08  
   last obs. used      2019-04-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54205  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-12 23:47:15  

Additional Information
 Earth MOID = 1.47988 au 
 Jupiter MOID = 2.28551 au 
 T_jup = 3.366 
[ 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 14.1   n/a MPO244370  
diameter diameter 6.956 km 0.123 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.092   0.011 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20918 (6539 P-L)          Discovered 1960-Sep-24 by van Houten, C. J., van Houten-Groeneveld, I., Gehrels, T. at Palomar
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 6539 P-L = 1998 HM63 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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