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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1661631924334563 3.4816e-08  
a 2.625081890186062 1.4573e-08 au
q 2.188889902913494 9.11e-08 au
i 11.29324753665782 5.1082e-06 deg
node 358.1656189868692 2.086e-05 deg
peri 268.1683145387445 2.8933e-05 deg
M 52.88413163781286 1.6599e-05 deg
tp 2458972.289518370099
(2020-May-02.78951837)
7.2254e-05 TDB
period 1553.505197918798
4.25
1.2936e-05
3.542e-08
d
yr
n .2317340170359811 1.9296e-09 deg/d
Q 3.061273877458631 1.6994e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1100  
   data-arc span      14494 days (39.68 yr)  
   first obs. used      1981-02-02  
   last obs. used      2020-10-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .53343  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:09:53  

Additional Information
 Earth MOID = 1.20749 au 
 Jupiter MOID = 2.15286 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 14.69   n/a E2021B10  
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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