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18364 (1990 WF4)
Classification: Main-belt Asteroid          SPK-ID: 2018364
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1429456624255402 3.5635e-08  
a 3.14750402180103 1.94e-08 au
q 2.69758197441763 1.1051e-07 au
i 11.9836576486249 4.3921e-06 deg
node 95.42562026152804 2.1833e-05 deg
peri 46.67628285103239 2.7917e-05 deg
M 116.3197789736695 1.6885e-05 deg
tp 2458737.479483836565
(2019-Sep-10.97948384)
9.5313e-05 TDB
period 2039.613451058401
5.58
1.8857e-05
5.163e-08
d
yr
n .1765040330623374 1.6319e-09 deg/d
Q 3.59742606918443 2.2173e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1512  
   data-arc span      11184 days (30.62 yr)  
   first obs. used      1990-11-16  
   last obs. used      2021-06-30  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48773  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 14:32:45  

Additional Information
 Earth MOID = 1.72819 au 
 Jupiter MOID = 1.55513 au 
 T_jup = 3.159 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457213.5 (2015-Jul-10.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1447297135999201 3.564e-08  
q 2.69117943676042 1.1084e-07 au
tp 2456696.838942072602
(2014-Feb-08.33894207)
9.5518e-05 TDB
node 95.45022763867118 2.1829e-05 deg
peri 46.50527661751868 2.7764e-05 deg
i 11.98707464085513 4.3935e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1512  
   data-arc span      11184 days (30.62 yr)  
   first obs. used      1990-11-16  
   last obs. used      2021-06-30  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48773  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 14:32:45  

Additional Information
 Jupiter MOID = 1.55513 au 
 T_jup = 3.159 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.270194169565209E-15 -3.905764385648032E-15 1.098127728733997E-13 -1.707701858180919E-15 1.141407816423531E-14 -8.53862711086095E-16
q -3.905764385648032E-15 1.228441399231405E-14 -6.340666945125169E-13 4.054628844243209E-15 -7.209062372495865E-14 2.464962793790385E-15
tp 1.098127728733997E-13 -6.340666945125169E-13 9.123683104924063E-9 -4.006628293081594E-12 1.664811709303481E-9 -3.155027401486963E-12
node -1.707701858180919E-15 4.054628844243209E-15 -4.006628293081594E-12 4.764864822294646E-10 -4.667791394713034E-10 -1.468471348884389E-11
peri 1.141407816423531E-14 -7.209062372495865E-14 1.664811709303481E-9 -4.667791394713034E-10 7.70844499359956E-10 1.375992643720489E-11
i -8.53862711086095E-16 2.464962793790385E-15 -3.155027401486963E-12 -1.468471348884389E-11 1.375992643720489E-11 1.930291852136303E-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 13.66   n/a MPO636341  
diameter diameter 13.657 km 0.294 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.034   0.004 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18364 (1990 WF4)          Discovered 1990-Nov-16 by Elst, E. W. at La Silla
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1990 WF4 = 1998 HU120 = 1999 NQ17 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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