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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1017300577634978 3.757e-08  
a 2.294631694066539 1.1025e-08 au
q 2.061198679283197 8.9386e-08 au
i 6.11963141453393 4.0071e-06 deg
node 262.107868841534 4.8398e-05 deg
peri 4.793720821692598 5.4692e-05 deg
M 25.72632200191126 2.6367e-05 deg
tp 2458909.771629886280
(2020-Mar-01.27162989)
9.2843e-05 TDB
period 1269.602908589603
3.48
9.15e-06
2.505e-08
d
yr
n .2835532256301481 2.0436e-09 deg/d
Q 2.528064708849881 1.2147e-08 au
  Orbit Determination Parameters
   # obs. used (total)      634  
   data-arc span      14005 days (38.34 yr)  
   first obs. used      1981-02-14  
   last obs. used      2019-06-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55177  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 05:28:07  

Additional Information
 Earth MOID = 1.04534 au 
 Jupiter MOID = 2.53711 au 
 T_jup = 3.581 
[ 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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