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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1545599579678787 3.5449e-08  
a 3.212919670109111 2.146e-08 au
q 2.716330940942876 1.192e-07 au
i 6.306744696664851 3.9699e-06 deg
node 128.2095378508311 3.9682e-05 deg
peri 180.1785017637366 4.2056e-05 deg
M .6263689030974013 1.501e-05 deg
tp 2459196.840043567481
(2020-Dec-13.34004357)
8.7692e-05 TDB
period 2103.527664274847
5.76
2.1076e-05
5.77e-08
d
yr
n .1711410817713698 1.7147e-09 deg/d
Q 3.709508399275346 2.4777e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1589  
   data-arc span      12486 days (34.18 yr)  
   first obs. used      1986-08-01  
   last obs. used      2020-10-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5319  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:35:48  

Additional Information
 Earth MOID = 1.69964 au 
 Jupiter MOID = 1.55947 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 13.27   n/a E2021B10  
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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