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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 9 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1025255663136542 7.7767e-08  
a 2.922546963273654 2.4144e-08 AU
q 2.622911180785773 2.3144e-07 AU
i 1.797698649542501 8.2284e-06 deg
node 8.101725786179399 0.00016423 deg
peri 36.8751694519561 0.00016722 deg
M 354.4933774081776 2.8398e-05 deg
tp 2457028.414090767400
(2015-Jan-05.91409077)
0.00014401 JED
period 1824.906738876128
5.00
2.2615e-05
6.192e-08
d
yr
n .1972703548794535 2.4446e-09 deg/d
Q 3.222182745761536 2.662e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1020  
   data-arc span      7384 days (20.22 yr)  
   first obs. used      1994-10-31  
   last obs. used      2015-01-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .50487  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Feb-04 14:00:38  

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 (327)
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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