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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 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02595192942432294 9.7963e-08  
a 5.147014410545792 1.7715e-07 au
q 5.013439455817335 5.9919e-07 au
i 19.62045400737513 9.7749e-06 deg
node 289.393801231828 2.3402e-05 deg
peri 2.036485191363217 0.0001628 deg
M 303.9025915484576 0.00016457 deg
tp 2458065.117543454933
(2017-Nov-07.61754345)
0.001961 JED
period 4265.122440557182
11.68
0.0002202
6.029e-07
d
yr
n .08440554873096931 4.3576e-09 deg/d
Q 5.28058936527425 1.8175e-07 au
  Orbit Determination Parameters
   # obs. used (total)      713  
   data-arc span      8844 days (24.21 yr)  
   first obs. used      1991-03-06  
   last obs. used      2015-05-23  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .48903  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jun-04 16:06:47  

Additional Information
 Earth MOID = 3.99546 au 
 Jupiter MOID = .0676736 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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