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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 ]

[ show orbit diagram ]
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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2458051.5 (2017-Oct-25.0) TDB
Reference: JPL 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1643446674259404 5.9777e-08  
q 2.605542101254469 1.7532e-07 au
tp 2458643.370716487787
(2019-Jun-08.87071649)
0.0001459 TDB
node 45.17128017299239 3.9132e-05 deg
peri 102.5902102561783 4.7613e-05 deg
i 8.626723390371753 8.8705e-06 deg
  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
 Jupiter MOID = 1.46066 au 
 T_jup = 3.179 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.573296102118325E-15 -1.026693174155431E-14 3.523091194471258E-12 -3.22122455623669E-15 5.382412996512322E-13 -3.240774328357661E-15
q -1.026693174155431E-14 3.073792397283933E-14 -8.921554814108773E-12 2.759898296783591E-15 -1.395791750773991E-12 1.175016166682107E-14
tp 3.523091194471258E-12 -8.921554814108773E-12 2.128651809815503E-8 -4.933029109182543E-11 3.963991521192213E-9 3.799313202087454E-12
node -3.22122455623669E-15 2.759898296783591E-15 -4.933029109182543E-11 1.531295388884051E-9 -1.522484174546236E-9 -8.973898387465534E-11
peri 5.382412996512322E-13 -1.395791750773991E-12 3.963991521192213E-9 -1.522484174546236E-9 2.267004718435488E-9 8.948298304430743E-11
i -3.240774328357661E-15 1.175016166682107E-14 3.799313202087454E-12 -8.973898387465534E-11 8.948298304430743E-11 7.868608802315503E-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

[ 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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