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390187 (2012 WH18)
Classification: Main-belt Asteroid          SPK-ID: 2390187
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 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1636737466650842 5.9859e-08  
a 3.116367616646137 4.5481e-08 au
q 2.606300052843925 1.7525e-07 au
i 8.626103434470636 8.8699e-06 deg
node 45.16443753845023 3.9142e-05 deg
peri 102.6892046037157 4.7674e-05 deg
M 63.90354979335394 2.6763e-05 deg
tp 2458643.807536059103
(2019-Jun-09.30753606)
0.00014632 TDB
period 2009.423379983776
5.50
4.3989e-05
1.204e-07
d
yr
n .1791558730658875 3.922e-09 deg/d
Q 3.626435180448349 5.2925e-08 au
  Orbit Determination Parameters
   # obs. used (total)      158  
   data-arc span      4955 days (13.57 yr)  
   first obs. used      2006-11-16  
   last obs. used      2020-06-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .64708  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 16:43:05  

Additional Information
 Earth MOID = 1.63454 au 
 Jupiter MOID = 1.46066 au 
 T_jup = 3.179 
[ 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 16.3   n/a MPO427945  

390187 (2012 WH18)          Discovered 2007-Nov-17 by Mt. Lemmon Survey at Mount Lemmon
Reference: Last Updated: 2014-03-21

[ show close-approach data ]
Alternate Designations
 2012 WH18 = 2009 HW24 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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