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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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1553689702478491 3.3697e-08  
a 2.23158565562933 6.4251e-09 au
q 1.88486649029433 7.4695e-08 au
i 4.959837112980478 3.714e-06 deg
node 270.1806171333577 5.1143e-05 deg
peri 175.0177905270139 5.3385e-05 deg
M 284.0271712161498 1.4121e-05 deg
tp 2458857.465349675927
(2020-Jan-08.96534968)
4.7707e-05 TDB
period 1217.639613585094
3.33
5.2587e-06
1.44e-08
d
yr
n .295653981673652 1.2769e-09 deg/d
Q 2.57830482096433 7.4234e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1649  
   data-arc span      10971 days (30.04 yr)  
   first obs. used      1989-11-20  
   last obs. used      2019-12-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46265  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-14 00:27:43  

Additional Information
 Earth MOID = .901104 au 
 Jupiter MOID = 2.62623 au 
 T_jup = 3.621 
[ show covariance matrix ]

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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