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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 2456800.5 (2014-May-23.0) TDB
Reference: JPL 7 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02529679328883587 1.1531e-07  
a 5.144116628664335 1.994e-07 AU
q 5.01398697365535 6.3896e-07 AU
i 19.62043272139881 1.2438e-05 deg
node 289.3959928714104 2.4246e-05 deg
peri 3.098277447974687 0.00018213 deg
M 252.1038682162745 0.00018585 deg
tp 2458077.726764661784
(2017-Nov-20.22676466)
0.0022342 JED
period 4261.521035804143
11.67
0.00024778
6.784e-07
d
yr
n .08447687972800737 4.9117e-09 deg/d
Q 5.27424628367332 2.0444e-07 AU
  Orbit Determination Parameters
   # obs. used (total)      670  
   data-arc span      8433 days (23.09 yr)  
   first obs. used      1991-03-06  
   last obs. used      2014-04-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .48649  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jun-09 19:39:32  

Additional Information
 Earth MOID = 3.99716 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 (413)
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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