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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1054358167832403 3.152e-08  
a 2.266511624036281 7.9561e-09 au
q 2.027540119707307 7.4034e-08 au
i 2.375534415999098 3.5052e-06 deg
node 284.0945913266577 0.0001161 deg
peri 175.7250065315098 0.00011911 deg
M 302.2706622790848 2.6995e-05 deg
tp 2459400.361631099253
(2021-Jul-04.86163110)
9.383e-05 TDB
period 1246.336612132371
3.41
6.5625e-06
1.797e-08
d
yr
n .2888465254856568 1.5209e-09 deg/d
Q 2.505483128365255 8.7949e-09 au
  Orbit Determination Parameters
   # obs. used (total)      943  
   data-arc span      15091 days (41.32 yr)  
   first obs. used      1979-09-18  
   last obs. used      2021-01-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52133  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:45:27  

Additional Information
 Earth MOID = 1.04424 au 
 Jupiter MOID = 2.60937 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 15.88   n/a E2021B10  
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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