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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 8 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1025255635224474 7.7786e-08  
a 2.922546968164512 2.4317e-08 AU
q 2.622911193332625 2.3156e-07 AU
i 1.797698157348449 8.2622e-06 deg
node 8.101731633942396 0.00016456 deg
peri 36.87516739266958 0.00016756 deg
M 354.493372181792 2.8566e-05 deg
tp 2457028.414117330989
(2015-Jan-05.91411733)
0.00014486 JED
period 1824.906743457077
5.00
2.2776e-05
6.236e-08
d
yr
n .1972703543842581 2.462e-09 deg/d
Q 3.222182742996398 2.681e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      993  
   data-arc span      7358 days (20.15 yr)  
   first obs. used      1994-10-31  
   last obs. used      2014-12-23  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .50458  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jan-08 02:51:34  

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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