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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 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08969629350632563 5.6476e-08  
a 2.194572847271244 8.6663e-09 au
q 1.99772779704139 1.2474e-07 au
i 5.860956139385622 5.0682e-06 deg
node 103.6001315233224 5.0837e-05 deg
peri 321.2427772488293 5.6471e-05 deg
M 64.34664028704718 2.4111e-05 deg
tp 2457388.250437116500
(2015-Dec-31.75043712)
7.9501e-05 JED
period 1187.47213991592
3.25
7.0339e-06
1.926e-08
d
yr
n .3031650073285004 1.7958e-09 deg/d
Q 2.391417897501098 9.4437e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1221  
   data-arc span      9628 days (26.36 yr)  
   first obs. used      1989-11-23  
   last obs. used      2016-04-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .51028  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Apr-25 13:04:11  

Additional Information
 Earth MOID = 1.01375 au 
 Jupiter MOID = 2.82436 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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