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120207 (2004 EG31)
Classification: Main-belt Asteroid          SPK-ID: 2120207
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1445009952863902 3.42e-08  
a 2.348309838962452 9.9227e-09 au
q 2.008976729991555 7.8985e-08 au
i 8.988956745086265 4.585e-06 deg
node 191.0126834542964 2.5328e-05 deg
peri 63.18269649185947 3.2251e-05 deg
M 122.2431494341652 1.7055e-05 deg
tp 2458554.172595762855
(2019-Mar-11.67259576)
6.2603e-05 TDB
period 1314.412024470184
3.60
8.331e-06
2.281e-08
d
yr
n .273886721437374 1.7359e-09 deg/d
Q 2.687642947933349 1.1356e-08 au
  Orbit Determination Parameters
   # obs. used (total)      595  
   data-arc span      8211 days (22.48 yr)  
   first obs. used      1997-05-09  
   last obs. used      2019-11-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51815  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 14:11:00  

Additional Information
 Earth MOID = 1.01394 au 
 Jupiter MOID = 2.36903 au 
 T_jup = 3.529 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 16.1   n/a MPO436580  
rotation period rot_per 5.707 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]

120207 (2004 EG31)          Discovered 2004-Mar-13 by NEAT at Palomar
Reference: 20051116/Numbers.arcLast Updated: 2005-11-21

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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