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20973 (1981 EL2)
Classification: Main-belt Asteroid          SPK-ID: 2020973
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1664405464003155 6.3266e-08  
a 2.616605346079535 1.8002e-08 au
q 2.181096122564071 1.7039e-07 au
i 10.76799474563981 5.4713e-06 deg
node 227.7755225304566 3.2329e-05 deg
peri 97.84983387988655 3.5245e-05 deg
M 220.2847740637488 1.4872e-05 deg
tp 2459200.494127999581
(2020-Dec-16.99412800)
6.5552e-05 TDB
period 1545.986735750647
4.23
1.5955e-05
4.368e-08
d
yr
n .232860988826792 2.4031e-09 deg/d
Q 3.052114569595 2.0999e-08 au
  Orbit Determination Parameters
   # obs. used (total)      759  
   data-arc span      13967 days (38.24 yr)  
   first obs. used      1981-02-02  
   last obs. used      2019-05-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .58165  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-12 23:47:52  

Additional Information
 Earth MOID = 1.20075 au 
 Jupiter MOID = 2.36467 au 
 T_jup = 3.362 
[ 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 14.8   n/a MPO384934  
diameter diameter 7.311 km 0.197 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.048   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20973 (1981 EL2)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1981 EL2 = 1998 FC100 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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