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243678 (1999 WH20)
Classification: Main-belt Asteroid          SPK-ID: 2243678
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 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1610613468202456 1.1478e-07  
a 2.545968695155773 1.4357e-08 au
q 2.135911548151801 3.0091e-07 au
i 26.77461949955012 5.2972e-06 deg
node 238.2945726615318 1.0413e-05 deg
peri 170.5731420195705 1.8036e-05 deg
M 25.54982498639098 1.6293e-05 deg
tp 2458895.191495652481
(2020-Feb-15.69149565)
6.6666e-05 TDB
period 1483.809050954367
4.06
1.2551e-05
3.436e-08
d
yr
n .2426188192937983 2.0523e-09 deg/d
Q 2.956025842159745 1.667e-08 au
  Orbit Determination Parameters
   # obs. used (total)      729  
   data-arc span      7417 days (20.31 yr)  
   first obs. used      1999-10-14  
   last obs. used      2020-02-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48117  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-25 09:23:34  

Additional Information
 Earth MOID = 1.14978 au 
 Jupiter MOID = 2.42525 au 
 T_jup = 3.276 
[ 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 15.8   n/a MPO300152  
diameter diameter 5.253 km 0.385 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.037   0.003 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

243678 (1999 WH20)          Discovered 1999-Nov-16 by LINEAR at Socorro
Reference: 20100726/Numbers.arcLast Updated: 2010-07-28
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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