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18347 (1989 WU)
Classification: Main-belt Asteroid          SPK-ID: 2018347
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .155460037777699 3.3026e-08  
a 2.231885984733563 6.1024e-09 au
q 1.884916905231366 7.3518e-08 au
i 4.959816861333669 3.6955e-06 deg
node 270.1802137285698 4.4169e-05 deg
peri 174.946168096234 4.6657e-05 deg
M 42.33382934395619 1.2926e-05 deg
tp 2458857.284016952669
(2020-Jan-08.78401695)
4.3836e-05 TDB
period 1217.885428651872
3.33
4.9949e-06
1.368e-08
d
yr
n .2955943075848268 1.2123e-09 deg/d
Q 2.578855064235759 7.0511e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1845  
   data-arc span      11132 days (30.48 yr)  
   first obs. used      1989-11-20  
   last obs. used      2020-05-13  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45009  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 02:15:32  

Additional Information
 Earth MOID = .90119 au 
 Jupiter MOID = 2.62511 au 
 T_jup = 3.620 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456653.5 (2013-Dec-27.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .154889869734416 3.2948e-08  
q 1.886033421642105 7.3292e-08 au
tp 2456420.618155545042
(2013-May-08.11815555)
4.7163e-05 TDB
node 270.2533104579849 4.4222e-05 deg
peri 174.7112471718402 4.6739e-05 deg
i 4.956125162068345 3.6937e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1845  
   data-arc span      11132 days (30.48 yr)  
   first obs. used      1989-11-20  
   last obs. used      2020-05-13  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45009  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 02:15:32  

Additional Information
 Jupiter MOID = 2.62511 au 
 T_jup = 3.620 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.085564624753751E-15 -2.408901908785182E-15 -1.199476182487603E-13 -2.951501303419071E-15 -5.444127320151262E-14 -8.502809180200092E-16
q -2.408901908785182E-15 5.37171767714542E-15 1.734347925938742E-13 5.54651976439196E-15 9.360518000064555E-14 2.006785163073746E-15
tp -1.199476182487603E-13 1.734347925938742E-13 2.224356884774073E-9 7.218746489366436E-12 7.256626642493557E-10 -1.944814839374297E-12
node -2.951501303419071E-15 5.54651976439196E-15 7.218746489366436E-12 1.955559863063243E-9 -1.945229325491374E-9 1.169215324457939E-11
peri -5.444127320151262E-14 9.360518000064555E-14 7.256626642493557E-10 -1.945229325491374E-9 2.184543806675852E-9 -1.22682359636204E-11
i -8.502809180200092E-16 2.006785163073746E-15 -1.944814839374297E-12 1.169215324457939E-11 -1.22682359636204E-11 1.364318669910085E-11

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.2   n/a MPO412322  
diameter diameter 3.988 km 0.069 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.255   0.043 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18347 (1989 WU)          Discovered 1989-Nov-20 by Oohira at Oohira
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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