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JPL Small-Body Database Browser
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39500 (1981 EK30)
Classification: Main-belt Asteroid          SPK-ID: 2039500
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1013575478646319 3.7789e-08  
a 2.293748336674765 1.0961e-08 au
q 2.061259629850833 8.9659e-08 au
i 6.120608279781125 4.0411e-06 deg
node 262.110344206838 4.8456e-05 deg
peri 4.971502071468844 5.4767e-05 deg
M 272.1026613906976 2.627e-05 deg
tp 2458910.306340386983
(2020-Mar-01.80634039)
9.3041e-05 TDB
period 1268.869846390437
3.47
9.0953e-06
2.49e-08
d
yr
n .2837170423933508 2.0337e-09 deg/d
Q 2.526237043498698 1.2072e-08 au
  Orbit Determination Parameters
   # obs. used (total)      628  
   data-arc span      13953 days (38.20 yr)  
   first obs. used      1981-02-14  
   last obs. used      2019-04-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55832  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-13 02:06:59  

Additional Information
 Earth MOID = 1.04498 au 
 Jupiter MOID = 2.53903 au 
 T_jup = 3.582 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 16.0   n/a MPO436047  

39500 (1981 EK30)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20020526/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1981 EK30 = 1998 AR11 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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