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9031 (1989 WG4)
Classification: Main-belt Asteroid          SPK-ID: 2009031
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 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08968202473206555 5.6742e-08  
a 2.194385482376029 9.1118e-09 au
q 1.997588549273896 1.2549e-07 au
i 5.86116251066667 5.108e-06 deg
node 103.6013628876271 5.4356e-05 deg
peri 321.1686485468618 6.0066e-05 deg
M 3.774489036080972 2.6004e-05 deg
tp 2457388.051315038638
(2015-Dec-31.55131504)
8.5753e-05 JED
period 1187.320069882513
3.25
7.3952e-06
2.025e-08
d
yr
n .3032038362121029 1.8885e-09 deg/d
Q 2.391182415478161 9.929e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1110  
   data-arc span      9517 days (26.06 yr)  
   first obs. used      1989-11-23  
   last obs. used      2015-12-14  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .50742  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Jan-04 13:09:08  

Additional Information
 Earth MOID = 1.01439 au 
 Jupiter MOID = 2.82581 au 
 T_jup = 3.658 
[ 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 14.2 mag n/a MPO358718  

9031 (1989 WG4)          Discovered 1989-Nov-29 by Mrkos, A. at Klet
Reference: 19980808/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1989 WG4 = 1994 EM3 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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