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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06857330597294786 3.0957e-08  
a 2.66797428506658 1.0713e-08 au
q 2.485022468088752 8.5722e-08 au
i 7.785859104500067 3.8685e-06 deg
node 170.0402871983964 2.8271e-05 deg
peri 121.8117063829811 4.3275e-05 deg
M 310.9671321940409 3.2181e-05 deg
tp 2459217.298203907929
(2021-Jan-02.79820391)
0.00014218 TDB
period 1591.735439903624
4.36
9.5874e-06
2.625e-08
d
yr
n .2261682381224087 1.3623e-09 deg/d
Q 2.850926102044407 1.1448e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1671  
   data-arc span      25212 days (69.03 yr)  
   first obs. used      1951-08-08  
   last obs. used      2020-08-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51784  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 01:59:58  

Additional Information
 Earth MOID = 1.47985 au 
 Jupiter MOID = 2.28498 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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