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19938 (1981 EN15)
Classification: Main-belt Asteroid          SPK-ID: 2019938
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .105301967119753 4.675e-08  
a 2.266781078764287 9.6815e-09 au
q 2.028084572140572 1.0422e-07 au
i 2.375534455673278 4.7413e-06 deg
node 284.0954842830286 0.00011841 deg
peri 175.6580594374736 0.00012151 deg
M 244.5584001522754 2.704e-05 deg
tp 2459400.235419060490
(2021-Jul-04.73541906)
9.4393e-05 TDB
period 1246.558875237319
3.41
7.9861e-06
2.186e-08
d
yr
n .2887950237660964 1.8502e-09 deg/d
Q 2.505477585388003 1.0701e-08 au
  Orbit Determination Parameters
   # obs. used (total)      677  
   data-arc span      14927 days (40.87 yr)  
   first obs. used      1979-09-18  
   last obs. used      2020-07-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .57087  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-25 01:31:26  

Additional Information
 Earth MOID = 1.04497 au 
 Jupiter MOID = 2.60997 au 
 T_jup = 3.607 
[ 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 15.9   n/a MPO337426  
diameter diameter 2.073 km 0.259 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
geometric albedo albedo 0.216   0.094 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

19938 (1981 EN15)          Discovered 1981-Mar-01 by Bus, S. J. at Siding Spring
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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