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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 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1025905879452401 7.1598e-08  
a 2.923635741205748 2.2032e-08 au
q 2.623698231577733 2.1061e-07 au
i 1.797688839354809 7.5212e-06 deg
node 8.10231613212386 0.00015884 deg
peri 37.13890549192436 0.00016181 deg
M 73.1481649527733 2.7319e-05 deg
tp 2457029.491161942929
(2015-Jan-06.99116194)
0.00013832 JED
period 1825.926621491847
5.00
2.0639e-05
5.651e-08
d
yr
n .1971601683017619 2.2286e-09 deg/d
Q 3.223573250833764 2.4292e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1247  
   data-arc span      7716 days (21.13 yr)  
   first obs. used      1994-10-31  
   last obs. used      2015-12-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .50173  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Jan-04 13:48:44  

Additional Information
 Earth MOID = 1.63186 au 
 Jupiter MOID = 2.13973 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 13.8 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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