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19944 (1981 EF31)
Classification: Main-belt Asteroid          SPK-ID: 2019944
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 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05316236925721353 3.557e-08  
a 2.264434431824613 6.0166e-09 au
q 2.144051732401204 8.1581e-08 au
i 4.243067084559137 2.9887e-06 deg
node 161.0971102334014 4.8343e-05 deg
peri 261.6155887691795 5.5739e-05 deg
M 349.8520726860659 2.7545e-05 deg
tp 2459235.584306698112
(2021-Jan-21.08430670)
9.5226e-05 TDB
period 1244.623657678118
3.41
4.9604e-06
1.358e-08
d
yr
n .289244060065185 1.1528e-09 deg/d
Q 2.384817131248022 6.3364e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1596  
   data-arc span      14611 days (40.00 yr)  
   first obs. used      1981-02-09  
   last obs. used      2021-02-10  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48775  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:09:58  

Additional Information
 Earth MOID = 1.16072 au 
 Jupiter MOID = 2.74684 au 
 T_jup = 3.612 
[ 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 15.44   n/a E2021B10  

19944 (1981 EF31)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1981 EF31 = 1998 FB33 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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