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20621 (1999 TK11)
Classification: Main-belt Asteroid          SPK-ID: 2020621
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 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08350659953927045 1.0778e-08  
a 2.435171265375764 7.8049e-09 au
q 2.231818393708492 2.5492e-08 au
i 6.355385677658445 5.8386e-07 deg
node 356.8153479866869 1.7935e-06 deg
peri 105.2762604693619 1.175e-05 deg
M 135.155279017157 1.1484e-05 deg
tp 2458679.397441683567
(2019-Jul-14.89744168)
4.4105e-05 TDB
period 1388.010311976802
3.80
6.673e-06
1.827e-08
d
yr
n .2593640673225897 1.2469e-09 deg/d
Q 2.638524137043037 8.4566e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2361  
   data-arc span      13041 days (35.70 yr)  
   first obs. used      1984-10-30  
   last obs. used      2020-07-14  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42371  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:25:10  

Additional Information
 Earth MOID = 1.25844 au 
 Jupiter MOID = 2.45452 au 
 T_jup = 3.492 
[ 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 13.65   n/a E2021B10  
diameter diameter 4.362 km 0.151 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.370   0.066 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20621 (1999 TK11)          Discovered 1999-Oct-09 by Nomen, J. at Ametlla de Mar
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 TK11 = 1984 UJ5 = 1997 BS 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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