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9857 (1991 EN)
Classification: Jupiter Trojan          SPK-ID: 2009857
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .026201821207354 9.7691e-08  
a 5.148113930303219 1.7602e-07 au
q 5.013223969546325 5.9863e-07 au
i 19.62034662660902 9.6974e-06 deg
node 289.3942117525486 2.3341e-05 deg
peri 1.909980817915029 0.00016057 deg
M 320.9242781283909 0.00016245 deg
tp 2458063.600404263767
(2017-Nov-06.10040426)
0.0019329 JED
period 4266.4892047992
11.68
0.00021881
5.991e-07
d
yr
n .0843785095237205 4.3275e-09 deg/d
Q 5.283003891060113 1.8063e-07 au
  Orbit Determination Parameters
   # obs. used (total)      717  
   data-arc span      9173 days (25.11 yr)  
   first obs. used      1991-03-06  
   last obs. used      2016-04-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .4922  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Apr-25 13:06:35  

Additional Information
 Earth MOID = 3.99669 au 
 Jupiter MOID = .0688866 au 
 T_jup = 2.884 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 10.2 mag n/a MPO263437  

9857 (1991 EN)          Discovered 1991-Mar-10 by McNaught, R. H. at Siding Spring
Reference: 19990106/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1991 EN = 1994 NH1 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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