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21864 (1999 TD238)
Classification: Main-belt Asteroid          SPK-ID: 2021864
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08688174060719732 3.1712e-08  
a 2.293789345356885 6.8406e-09 au
q 2.094500934446035 7.2243e-08 au
i 5.351177470786013 3.2554e-06 deg
node 105.9124626568266 3.8302e-05 deg
peri 162.4518502466975 4.3532e-05 deg
M 139.7862513193043 2.0112e-05 deg
tp 2458707.790789088098
(2019-Aug-12.29078909)
7.0971e-05 TDB
period 1268.903874695934
3.47
5.6762e-06
1.554e-08
d
yr
n .283709433928765 1.2691e-09 deg/d
Q 2.493077756267735 7.4349e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1576  
   data-arc span      9884 days (27.06 yr)  
   first obs. used      1994-01-10  
   last obs. used      2021-02-01  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51155  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:54:21  

Additional Information
 Earth MOID = 1.07725 au 
 Jupiter MOID = 2.5644 au 
 T_jup = 3.586 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.2   n/a MPO431752  

21864 (1999 TD238)          Discovered 1999-Oct-04 by CSS at Catalina
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 TD238 = 1994 AT11 = 1998 HS116 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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