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312965 (1998 EW9)
Classification: Main-belt Asteroid          SPK-ID: 2312965
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 9 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2374253455220483 6.896e-08  
a 2.309623276441167 8.8953e-09 au
q 1.761260172006358 1.6031e-07 au
i 4.82590146110095 5.8e-06 deg
node 156.3567043915729 5.4235e-05 deg
peri 347.2660257454966 5.8375e-05 deg
M 141.1711884672087 1.763e-05 deg
tp 2458497.748102287501
(2019-Jan-14.24810229)
6.271e-05 TDB
period 1282.065307671051
3.51
7.4067e-06
2.028e-08
d
yr
n .2807969280862625 1.6222e-09 deg/d
Q 2.857986380875976 1.1007e-08 au
  Orbit Determination Parameters
   # obs. used (total)      344  
   data-arc span      7760 days (21.25 yr)  
   first obs. used      1998-02-28  
   last obs. used      2019-05-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .63281  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Sep-24 06:02:35  

Additional Information
 Earth MOID = .773999 au 
 Jupiter MOID = 2.16255 au 
 T_jup = 3.543 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 17.5   n/a MPO476407  

312965 (1998 EW9)          Discovered 1998-Mar-05 by Beijing Schmidt CCD Asteroid Program at Xinglong
Reference: 20120207/Numbers.arcLast Updated: 2012-02-09

Alternate Designations
 1998 EW9 = 2005 ES33 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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