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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1053019410264541 4.7078e-08  
a 2.266781072710906 9.7187e-09 au
q 2.028084625872419 1.0489e-07 au
i 2.37553395375609 4.7499e-06 deg
node 284.0954426388064 0.00011845 deg
peri 175.6581053331677 0.00012155 deg
M 244.5583977287425 2.7041e-05 deg
tp 2459400.235425851144
(2021-Jul-04.73542585)
9.4396e-05 TDB
period 1246.558870243963
3.41
8.0168e-06
2.195e-08
d
yr
n .2887950249229262 1.8573e-09 deg/d
Q 2.505477519549391 1.0742e-08 au
  Orbit Determination Parameters
   # obs. used (total)      667  
   data-arc span      14581 days (39.92 yr)  
   first obs. used      1979-09-18  
   last obs. used      2019-08-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .57709  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Sep-24 01:28:56  

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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