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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06899984884429421 3.0931e-08  
a 2.669376329334112 1.0627e-08 au
q 2.485189766101521 8.5748e-08 au
i 7.786309697324251 3.7921e-06 deg
node 170.0177801183132 2.7682e-05 deg
peri 121.5900627415935 4.1858e-05 deg
M 356.4201153305416 3.0992e-05 deg
tp 2459216.340893318421
(2021-Jan-01.84089332)
0.00013713 TDB
period 1592.990311471257
4.36
9.5128e-06
2.604e-08
d
yr
n .2259900750228108 1.3495e-09 deg/d
Q 2.853562892566702 1.136e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1693  
   data-arc span      25212 days (69.03 yr)  
   first obs. used      1951-08-08  
   last obs. used      2020-08-17  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51484  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:34:41  

Additional Information
 Earth MOID = 1.47812 au 
 Jupiter MOID = 2.28142 au 
 T_jup = 3.365 
[ 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 14.20   n/a E2021B10  
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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