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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1055648841703431 3.1093e-08  
a 2.266855950613068 7.9254e-09 au
q 2.027555564755747 7.3038e-08 au
i 2.375421313501071 3.4657e-06 deg
node 284.0964360434537 0.00011265 deg
peri 175.6923169415645 0.00011549 deg
M 358.9115285547124 2.6121e-05 deg
tp 2459400.269197127796
(2021-Jul-04.76919713)
9.0462e-05 TDB
period 1246.620636564315
3.41
6.5377e-06
1.79e-08
d
yr
n .2887807159940489 1.5145e-09 deg/d
Q 2.50615633647039 8.762e-09 au
  Orbit Determination Parameters
   # obs. used (total)      951  
   data-arc span      15091 days (41.32 yr)  
   first obs. used      1979-09-18  
   last obs. used      2021-01-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52056  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:09:46  

Additional Information
 Earth MOID = 1.04464 au 
 Jupiter MOID = 2.60876 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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