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20997 (1986 PL1)
Classification: Outer Main-belt Asteroid          SPK-ID: 2020997
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1543078614105856 3.5643e-08  
a 3.211234349841541 2.0639e-08 au
q 2.715715644829281 1.1938e-07 au
i 6.304720513171701 3.999e-06 deg
node 128.2173511008102 4.001e-05 deg
peri 180.4687691393134 4.2401e-05 deg
M 326.1550990068207 1.4975e-05 deg
tp 2459198.104656847717
(2020-Dec-14.60465685)
8.794e-05 TDB
period 2101.872789626849
5.75
2.0263e-05
5.548e-08
d
yr
n .1712758268610118 1.6512e-09 deg/d
Q 3.706753054853802 2.3823e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1575  
   data-arc span      12486 days (34.18 yr)  
   first obs. used      1986-08-01  
   last obs. used      2020-10-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53287  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 01:59:30  

Additional Information
 Earth MOID = 1.70106 au 
 Jupiter MOID = 1.56356 au 
 T_jup = 3.163 
[ 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 13.2   n/a MPO435895  
diameter diameter 12.205 km 1.755 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
geometric albedo albedo 0.068   0.020 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

20997 (1986 PL1)          Discovered 1986-Aug-01 by Helin, E. F. at Palomar
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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