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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1908147456729448 3.3202e-08  
a 2.288388422422814 5.0486e-09 au
q 1.851730167597293 7.4887e-08 au
i 5.099186349760676 3.6604e-06 deg
node 188.5732790802662 2.8071e-05 deg
peri 132.8145665741305 2.9268e-05 deg
M 49.72513653681901 7.3513e-06 deg
tp 2459025.850831132321
(2020-Jun-25.35083113)
2.5762e-05 TDB
period 1264.424899986138
3.46
4.1843e-06
1.146e-08
d
yr
n .2847144183920663 9.422e-10 deg/d
Q 2.725046677248335 6.012e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2186  
   data-arc span      14633 days (40.06 yr)  
   first obs. used      1981-02-12  
   last obs. used      2021-03-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .47538  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:35:42  

Additional Information
 Earth MOID = .84205 au 
 Jupiter MOID = 2.60648 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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