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20626 (1999 TH21)
Classification: Main-belt Asteroid          SPK-ID: 2020626
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 .2277013704246533 1.598e-08  
a 2.240728111071578 6.2126e-09 au
q 1.730511249431534 3.5423e-08 au
i 5.971306552871176 1.2478e-06 deg
node 8.945702414615377 2.9889e-06 deg
peri 270.6426599459414 7.0068e-06 deg
M 187.8035667328081 6.383e-06 deg
tp 2459786.508373420536
(2022-Jul-26.00837342)
2.2869e-05 TDB
period 1225.1299892144
3.35
5.0951e-06
1.395e-08
d
yr
n .2938463699112007 1.2221e-09 deg/d
Q 2.750944972711621 7.6272e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2019  
   data-arc span      14075 days (38.54 yr)  
   first obs. used      1982-08-21  
   last obs. used      2021-03-04  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .45966  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:25:22  

Additional Information
 Earth MOID = .725472 au 
 Jupiter MOID = 2.42214 au 
 T_jup = 3.593 
[ 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 14.38   n/a E2021B10  
diameter diameter 3.343 km 0.549 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  
geometric albedo albedo 0.309   0.123 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  

20626 (1999 TH21)          Discovered 1999-Oct-04 by LINEAR at Socorro
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 TH21 = 1998 DK6 = 1999 VK43 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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