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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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Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1984420780876126 3.805e-08  
a 2.408862574373912 1.2046e-08 au
q 1.930842879287677 8.8687e-08 au
i 7.129454651019597 4.343e-06 deg
node 338.6343052082804 3.356e-05 deg
peri 241.8424781083331 3.6184e-05 deg
M 251.2370544805111 1.7122e-05 deg
tp 2459809.067414129388
(2022-Aug-17.56741413)
6.7087e-05 TDB
period 1365.577848017788
3.74
1.0243e-05
2.804e-08
d
yr
n .26362466301175 1.9774e-09 deg/d
Q 2.886882269460147 1.4436e-08 au
  Orbit Determination Parameters
   # obs. used (total)      505  
   data-arc span      14581 days (39.92 yr)  
   first obs. used      1981-02-09  
   last obs. used      2021-01-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .55777  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 14:11:29  

Additional Information
 Earth MOID = .936307 au 
 Jupiter MOID = 2.1347 au 
 T_jup = 3.484 
[ 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 16.19   n/a MPCxxxxx  

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

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