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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 10 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02549070991415319 1.1332e-07  
a 5.144900299291474 1.9663e-07 AU
q 5.013753138224995 6.3452e-07 AU
i 19.62034792021193 1.2209e-05 deg
node 289.3949312009872 2.4194e-05 deg
peri 2.680814578169742 0.00017981 deg
M 269.4417971428763 0.00018369 deg
tp 2458072.732992171103
(2017-Nov-15.23299217)
0.0022026 JED
period 4262.494892821653
11.67
0.00024436
6.69e-07
d
yr
n .08445757919998118 4.8418e-09 deg/d
Q 5.276047460357954 2.0165e-07 AU
  Orbit Determination Parameters
   # obs. used (total)      688  
   data-arc span      8755 days (23.97 yr)  
   first obs. used      1991-03-06  
   last obs. used      2015-02-23  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .48211  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Mar-09 14:20:01  

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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