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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 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02549068219918545 1.0315e-07  
a 5.144900258102659 1.836e-07 AU
q 5.013753240676857 6.1051e-07 AU
i 19.62034851910637 1.0816e-05 deg
node 289.394931812167 2.3783e-05 deg
peri 2.680779770822149 0.00016995 deg
M 269.4418348812659 0.00017208 deg
tp 2458072.732532462575
(2017-Nov-15.23253246)
0.0020588 JED
period 4262.494841634914
11.67
0.00022816
6.247e-07
d
yr
n .08445758021420129 4.5209e-09 deg/d
Q 5.276047275528461 1.8828e-07 AU
  Orbit Determination Parameters
   # obs. used (total)      702  
   data-arc span      8788 days (24.06 yr)  
   first obs. used      1991-03-06  
   last obs. used      2015-03-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .48154  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Apr-07 16:36:15  

Additional Information
 Earth MOID = 3.99882 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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