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181791 (1998 EX9)
Classification: Main-belt Asteroid          SPK-ID: 2181791
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 10 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1218102108032212 7.3058e-08  
a 2.202246752988449 2.0756e-08 au
q 1.933990611766216 1.6128e-07 au
i 4.511523256370888 9.8964e-06 deg
node 176.5745827514123 8.8549e-05 deg
peri 46.3897422072933 9.6982e-05 deg
M 125.2176210594315 4.1449e-05 deg
tp 2456985.297134409270
(2014-Nov-23.79713441)
0.0001353 JED
period 1193.706048302251
3.27
1.6876e-05
4.62e-08
d
yr
n .3015817843195233 4.2636e-09 deg/d
Q 2.470502894210682 2.3284e-08 au
  Orbit Determination Parameters
   # obs. used (total)      239  
   data-arc span      6453 days (17.67 yr)  
   first obs. used      1998-03-08  
   last obs. used      2015-11-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .603  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Nov-30 21:51:37  

Additional Information
 Earth MOID = .92831 au 
 Jupiter MOID = 2.50297 au 
 T_jup = 3.650 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 17.1 mag n/a MPO245282  

181791 (1998 EX9)          Discovered 1998-Mar-08 by Beijing Schmidt CCD Asteroid Program at Xinglong
Reference: 20080420/Numbers.arcLast Updated: 2008-04-23

[ show close-approach data ]
Alternate Designations
 1998 EX9 = 2002 PA35 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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