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20704 (1999 WH)
Classification: Main-belt Asteroid          SPK-ID: 2020704
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 46 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0856940871865598 1.6025e-08  
a 2.993080605123196 1.4728e-08 au
q 2.736591294791368 5.0187e-08 au
i 11.23984020695058 6.6618e-07 deg
node 53.88077199275303 4.083e-06 deg
peri 234.7893598788136 1.4121e-05 deg
M 172.3304509857883 1.6649e-05 deg
tp 2458295.110257715706
(2018-Jun-25.61025772)
8.5101e-05 TDB
period 1891.368039472173
5.18
1.3961e-05
3.822e-08
d
yr
n .1903384177415125 1.4049e-09 deg/d
Q 3.249569915455025 1.599e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2920  
   data-arc span      24489 days (67.05 yr)  
   first obs. used      1954-02-26  
   last obs. used      2021-03-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .41209  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:27:32  

Additional Information
 Earth MOID = 1.73671 au 
 Jupiter MOID = 1.88262 au 
 T_jup = 3.221 
[ show covariance matrix ]

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 12.31   n/a E2021B10  
diameter diameter 11.820 km 0.185 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.200   0.037 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20704 (1999 WH)          Discovered 1999-Nov-16 by Kobayashi, T. at Oizumi
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 WH = 1980 BE2 = 1983 YR 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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