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JPL Small-Body Database Browser
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19940 (1981 EK20)
Classification: Main-belt Asteroid          SPK-ID: 2019940
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 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1661422248121758 3.5186e-08  
a 2.625685043408108 1.6432e-08 au
q 2.189447888640231 9.1564e-08 au
i 11.28948085467589 7.1379e-06 deg
node 358.190662598939 2.1157e-05 deg
peri 268.2916254153556 3.1395e-05 deg
M 6.433961369936746 2.2035e-05 deg
tp 2458972.726007070344
(2020-May-03.22600707)
9.5099e-05 TDB
period 1554.040641492783
4.25
1.4588e-05
3.994e-08
d
yr
n .2316541732487707 2.1746e-09 deg/d
Q 3.061922198175986 1.9162e-08 au
  Orbit Determination Parameters
   # obs. used (total)      910  
   data-arc span      13963 days (38.23 yr)  
   first obs. used      1981-02-02  
   last obs. used      2019-04-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56555  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-12 23:33:46  

Additional Information
 Earth MOID = 1.20965 au 
 Jupiter MOID = 2.15388 au 
 T_jup = 3.356 
[ 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 14.7   n/a MPO384925  
diameter diameter 6.448 km 0.189 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.074   0.014 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

19940 (1981 EK20)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1981 EK20 = 1998 EJ10 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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