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20707 (1999 WW4)
Classification: Main-belt Asteroid          SPK-ID: 2020707
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 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04095746419905239 1.7831e-08  
a 3.166916904598259 1.633e-08 au
q 3.037208018856802 5.5383e-08 au
i 11.49908829919288 2.9225e-07 deg
node 100.814275494708 3.595e-06 deg
peri 185.5560231357936 2.4525e-05 deg
M 54.2516430237963 2.2142e-05 deg
tp 2458890.284264102736
(2020-Feb-10.78426410)
0.00012621 TDB
period 2058.512124214006
5.64
1.5922e-05
4.359e-08
d
yr
n .1748835946921894 1.3527e-09 deg/d
Q 3.296625790339716 1.6999e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2231  
   data-arc span      11722 days (32.09 yr)  
   first obs. used      1988-12-07  
   last obs. used      2021-01-10  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44641  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:27:36  

Additional Information
 Earth MOID = 2.01903 au 
 Jupiter MOID = 1.82912 au 
 T_jup = 3.171 
[ 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 12.55   n/a E2021B10  
diameter diameter 24.46 km 1.7 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 4
geometric albedo albedo 0.0355   0.006 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 4

20707 (1999 WW4)          Discovered 1999-Nov-28 by Kobayashi, T. at Oizumi
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 WW4 = 1988 XF3 = 1991 LC5 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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