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21967 (1999 WS9)
Classification: Main-belt Asteroid          SPK-ID: 2021967
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 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08262636142406535 1.8039e-08  
a 2.681196749533118 9.9798e-09 au
q 2.459659217857165 4.7316e-08 au
i 10.35985589037883 3.112e-07 deg
node 81.41526699126035 2.4253e-06 deg
peri 209.2362225930277 1.483e-05 deg
M 82.18597849974697 1.3088e-05 deg
tp 2458834.410997519500
(2019-Dec-16.91099752)
5.8e-05 TDB
period 1603.5830356803
4.39
8.9532e-06
2.451e-08
d
yr
n .2244972614388344 1.2534e-09 deg/d
Q 2.902734281209071 1.0804e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2822  
   data-arc span      13873 days (37.98 yr)  
   first obs. used      1983-03-14  
   last obs. used      2021-03-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .39709  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:56:29  

Additional Information
 Earth MOID = 1.44669 au 
 Jupiter MOID = 2.21993 au 
 T_jup = 3.348 
[ 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 12.38   n/a E2021B10  
diameter diameter 19.650 km 0.119 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
geometric albedo albedo 0.063   0.011 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

21967 (1999 WS9)          Discovered 1999-Nov-30 by Kobayashi, T. at Oizumi
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 WS9 = 1983 ED3 = 1993 LN1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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