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JPL Small-Body Database Browser
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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05306767788874117 3.5947e-08  
a 2.264360702343499 9.4489e-09 au
q 2.14419633796761 8.1985e-08 au
i 4.243080136345906 4.8129e-06 deg
node 161.0974955655546 5.4334e-05 deg
peri 261.5484252163214 7.2197e-05 deg
M 292.0564335707476 4.9575e-05 deg
tp 2459235.389000312922
(2021-Jan-20.88900031)
0.00017185 TDB
period 1244.562871168999
3.41
7.7901e-06
2.133e-08
d
yr
n .2892581872234847 1.8106e-09 deg/d
Q 2.384525066719387 9.9503e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1047  
   data-arc span      13970 days (38.25 yr)  
   first obs. used      1981-02-09  
   last obs. used      2019-05-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53043  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-30 02:47:31  

Additional Information
 Earth MOID = 1.16158 au 
 Jupiter MOID = 2.74781 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 15.4   n/a MPO439232  

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

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