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85139 (1981 EN9)
Classification: Main-belt Asteroid          SPK-ID: 2085139
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1987922482574865 3.8637e-08  
a 2.408096102135056 1.2186e-08 au
q 1.929385263971539 8.9864e-08 au
i 7.129683422698577 6.1304e-06 deg
node 338.6397111743788 3.5773e-05 deg
peri 241.8799656035729 3.9683e-05 deg
M 146.7663696318187 1.8615e-05 deg
tp 2458444.040962807466
(2018-Nov-21.54096281)
6.8535e-05 TDB
period 1364.926133226927
3.74
1.036e-05
2.836e-08
d
yr
n .2637505365575324 2.002e-09 deg/d
Q 2.886806940298574 1.4608e-08 au
  Orbit Determination Parameters
   # obs. used (total)      437  
   data-arc span      14137 days (38.70 yr)  
   first obs. used      1981-02-09  
   last obs. used      2019-10-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .57579  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 10:09:03  

Additional Information
 Earth MOID = .934294 au 
 Jupiter MOID = 2.1371 au 
 T_jup = 3.484 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457138.5 (2015-Apr-26.0) TDB
Reference: JPL 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1982215163880657 3.8695e-08  
q 1.931211843604895 8.9989e-08 au
tp 2457078.376935055430
(2015-Feb-24.87693506)
6.4667e-05 TDB
node 338.6887313113273 3.577e-05 deg
peri 241.8604947017064 3.9691e-05 deg
i 7.129405176106022 6.1293e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      437  
   data-arc span      14137 days (38.70 yr)  
   first obs. used      1981-02-09  
   last obs. used      2019-10-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .57579  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 10:09:03  

Additional Information
 Jupiter MOID = 2.1371 au 
 T_jup = 3.484 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.497313265493249E-15 -3.464371605918118E-15 -5.167208605674112E-14 4.779602607389189E-15 -1.438813268998871E-14 1.310335800191385E-16
q -3.464371605918118E-15 8.098021641073202E-15 3.27195957063622E-13 -1.089120191010522E-14 8.658486531086752E-14 -4.271634290426285E-16
tp -5.167208605674112E-14 3.27195957063622E-13 4.181868330673918E-9 -3.59788024942237E-12 1.127905577090792E-9 3.8600857909068E-12
node 4.779602607389189E-15 -1.089120191010522E-14 -3.59788024942237E-12 1.279527147366822E-9 -1.269869943853454E-9 -5.378509156823951E-11
peri -1.438813268998871E-14 8.658486531086752E-14 1.127905577090792E-9 -1.269869943853454E-9 1.575372224269325E-9 5.442716874779474E-11
i 1.310335800191385E-16 -4.271634290426285E-16 3.8600857909068E-12 -5.378509156823951E-11 5.442716874779474E-11 3.756893016928332E-11

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 16.2   n/a MPO493472  

85139 (1981 EN9)          Discovered 1981-Mar-01 by Bus, S. J. at Siding Spring
Reference: 20040830/Numbers.arcLast Updated: 2004-09-06

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