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21808 (1999 TR18)
Classification: Main-belt Asteroid          SPK-ID: 2021808
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1025255736865796 7.7629e-08  
a 2.922546956058809 2.3777e-08 AU
q 2.622911152762912 2.3088e-07 AU
i 1.797701869049305 8.1592e-06 deg
node 8.101679997591317 0.00016323 deg
peri 36.87520953103499 0.00016622 deg
M 354.4933851438246 2.8038e-05 deg
tp 2457028.414051450606
(2015-Jan-05.91405145)
0.00014217 JED
period 1824.906732118451
5.00
2.227e-05
6.097e-08
d
yr
n .1972703556099508 2.4074e-09 deg/d
Q 3.222182759354705 2.6215e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1160  
   data-arc span      7434 days (20.35 yr)  
   first obs. used      1994-10-31  
   last obs. used      2015-03-09  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .49854  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Apr-07 17:10:19  

Additional Information
 Earth MOID = 1.63195 AU 
 T_jup = 3.271 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.8 mag n/a MPO319357  

21808 (1999 TR18)          Discovered 1999-Oct-14 by Beijing Schmidt CCD Asteroid Program at Xinglong
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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