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JPL Small-Body Database Browser
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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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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1636736825625343 9.2917e-08  
a 3.11636764863062 5.7989e-08 au
q 2.6063002793605 3.0658e-07 au
i 8.626106849702225 9.1187e-06 deg
node 45.16436234422472 5.8133e-05 deg
peri 102.6892730540524 6.4128e-05 deg
M 63.9035476137478 2.6895e-05 deg
tp 2458643.807542733771
(2019-Jun-09.30754273)
0.00014659 TDB
period 2009.423410919007
5.50
5.6086e-05
1.536e-07
d
yr
n .1791558703077687 5.0005e-09 deg/d
Q 3.626435017900739 6.748e-08 au
  Orbit Determination Parameters
   # obs. used (total)      120  
   data-arc span      4827 days (13.22 yr)  
   first obs. used      2006-11-16  
   last obs. used      2020-02-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .67757  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-26 04:31:02  

Additional Information
 Earth MOID = 1.63454 au 
 Jupiter MOID = 1.46066 au 
 T_jup = 3.179 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457565.5 (2016-Jun-26.0) TDB
Reference: JPL 11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1647016502146513 9.2722e-08  
q 2.603826698924775 3.066e-07 au
tp 2456632.437500663811
(2013-Dec-05.93750066)
0.00013809 TDB
node 45.17808386545028 5.8136e-05 deg
peri 102.5487612761264 6.4064e-05 deg
i 8.626234367330097 9.1189e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      120  
   data-arc span      4827 days (13.22 yr)  
   first obs. used      2006-11-16  
   last obs. used      2020-02-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .67757  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-26 04:31:02  

Additional Information
 Jupiter MOID = 1.46066 au 
 T_jup = 3.179 
Orbit Covariance (6×6)
  e q tp node peri i
e 8.597457114836287E-15 -2.809479720689184E-14 4.418343079683443E-12 1.974526295248492E-14 9.691099306029542E-13 -1.289851320176248E-14
q -2.809479720689184E-14 9.400176324028836E-14 -1.42075072962895E-11 -7.307601811087588E-14 -2.927744916919192E-12 4.616429945452799E-14
tp 4.418343079683443E-12 -1.42075072962895E-11 1.906830310055129E-8 -2.064095339965862E-11 3.771058593074242E-9 -1.394651843316644E-13
node 1.974526295248492E-14 -7.307601811087588E-14 -2.064095339965862E-11 3.379825970093081E-9 -3.345978635557743E-9 -1.718961692387919E-10
peri 9.691099306029542E-13 -2.927744916919192E-12 3.771058593074242E-9 -3.345978635557743E-9 4.104166749379388E-9 1.701687717618919E-10
i -1.289851320176248E-14 4.616429945452799E-14 -1.394651843316644E-13 -1.718961692387919E-10 1.701687717618919E-10 8.315523641766927E-11

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

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