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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 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1610613541981799 1.1435e-07  
a 2.545968694314539 1.4317e-08 au
q 2.135911528662068 2.9976e-07 au
i 26.77461901442708 5.2985e-06 deg
node 238.2945726799922 1.0405e-05 deg
peri 170.5731416557028 1.8032e-05 deg
M 25.54982592673498 1.6253e-05 deg
tp 2458895.191491828866
(2020-Feb-15.69149183)
6.6503e-05 TDB
period 1483.809050218951
4.06
1.2516e-05
3.427e-08
d
yr
n .2426188194140468 2.0465e-09 deg/d
Q 2.956025859967011 1.6623e-08 au
  Orbit Determination Parameters
   # obs. used (total)      731  
   data-arc span      7448 days (20.39 yr)  
   first obs. used      1999-10-14  
   last obs. used      2020-03-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4702  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 00:55:00  

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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