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JPL Small-Body Database Browser
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20988 (1981 EC43)
Classification: Main-belt Asteroid          SPK-ID: 2020988
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 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1911182026301591 3.5429e-08  
a 2.288236048504548 8.2284e-09 au
q 1.850912487720821 8.1733e-08 au
i 5.099441171933741 3.9497e-06 deg
node 188.6040137466697 3.9375e-05 deg
peri 132.942417103083 4.0457e-05 deg
M 238.7812144785394 1.1331e-05 deg
tp 2459026.213173407634
(2020-Jun-25.71317341)
4.1229e-05 TDB
period 1264.298613184965
3.46
6.8195e-06
1.867e-08
d
yr
n .2847428576173977 1.5359e-09 deg/d
Q 2.725559609288275 9.801e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1578  
   data-arc span      13953 days (38.20 yr)  
   first obs. used      1981-02-12  
   last obs. used      2019-04-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52207  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-12 23:48:07  

Additional Information
 Earth MOID = .842308 au 
 Jupiter MOID = 2.6045 au 
 T_jup = 3.571 
[ 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 14.8   n/a MPO474041  

20988 (1981 EC43)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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