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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 2456800.5 (2014-May-23.0) TDB
Reference: JPL 5 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1026623437676153 7.7942e-08  
a 2.923095862867794 3.3845e-08 AU
q 2.623003990528367 2.3183e-07 AU
i 1.797634062691481 8.3918e-06 deg
node 8.102004803281641 0.00018251 deg
peri 36.8149839729502 0.00018592 deg
M 315.1016915033783 3.5685e-05 deg
tp 2457028.161971890170
(2015-Jan-05.66197189)
0.00018297 JED
period 1825.420881649203
5.00
3.1703e-05
8.68e-08
d
yr
n .1972147922810836 3.4251e-09 deg/d
Q 3.223187735207222 3.7319e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      889  
   data-arc span      7178 days (19.65 yr)  
   first obs. used      1994-10-31  
   last obs. used      2014-06-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .52505  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jul-14 12:47:17  

Additional Information
 Earth MOID = 1.63113 AU 
 T_jup = 3.270 
[ 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 13.7 mag n/a MPO266070  

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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