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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 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1636737538057273 6.2821e-08  
a 3.116367613343682 4.6459e-08 au
q 2.606300027829126 1.8774e-07 au
i 8.626104547136634 9.0157e-06 deg
node 45.16442333712037 4.3974e-05 deg
peri 102.6892196182126 5.1811e-05 deg
M 63.90354970581289 2.6771e-05 deg
tp 2458643.807537114721
(2019-Jun-09.30753711)
0.00014634 TDB
period 2009.423376789658
5.50
4.4935e-05
1.23e-07
d
yr
n .1791558733506682 4.0063e-09 deg/d
Q 3.626435198858237 5.4063e-08 au
  Orbit Determination Parameters
   # obs. used (total)      143  
   data-arc span      4911 days (13.45 yr)  
   first obs. used      2006-11-16  
   last obs. used      2020-04-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .66343  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-22 01:15:27  

Additional Information
 Earth MOID = 1.63454 au 
 Jupiter MOID = 1.46066 au 
 T_jup = 3.179 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457925.5 (2017-Jun-21.0) TDB
Reference: JPL 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1644154473568373 6.2734e-08  
q 2.605255613718887 1.8785e-07 au
tp 2458643.295071993468
(2019-Jun-08.79507199)
0.00014584 TDB
node 45.1714562340916 4.3965e-05 deg
peri 102.5882973578713 5.1747e-05 deg
i 8.626666717340367 9.0164e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      143  
   data-arc span      4911 days (13.45 yr)  
   first obs. used      2006-11-16  
   last obs. used      2020-04-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .66343  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-22 01:15:27  

Additional Information
 Jupiter MOID = 1.46066 au 
 T_jup = 3.179 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.935593459496815E-15 -1.155090772954412E-14 3.499134400216371E-12 -8.902220842137514E-15 5.802901651654384E-13 -3.322341418501602E-15
q -1.155090772954412E-14 3.528779116150685E-14 -8.833896027592067E-12 1.616916366597189E-14 -1.537351595490337E-12 1.258632926792713E-14
tp 3.499134400216371E-12 -8.833896027592067E-12 2.127069885084871E-8 -9.138388085616961E-11 4.000071519354168E-9 7.308649566102115E-12
node -8.902220842137514E-15 1.616916366597189E-14 -9.138388085616961E-11 1.93291782264081E-9 -1.927168142042581E-9 -1.218816692940954E-10
peri 5.802901651654384E-13 -1.537351595490337E-12 4.000071519354168E-9 -1.927168142042581E-9 2.677713704365572E-9 1.218353325948938E-10
i -3.322341418501602E-15 1.258632926792713E-14 7.308649566102115E-12 -1.218816692940954E-10 1.218353325948938E-10 8.129523655741058E-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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