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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 7 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1025255642531512 7.7802e-08  
a 2.92254697334061 2.5893e-08 AU
q 2.622911195842525 2.3166e-07 AU
i 1.797698191065915 8.3568e-06 deg
node 8.101731568985448 0.000169 deg
peri 36.8751707958024 0.000172 deg
M 354.4933672300594 2.9832e-05 deg
tp 2457028.414142506397
(2015-Jan-05.91414251)
0.00015132 JED
period 1824.906748305193
5.00
2.4252e-05
6.64e-08
d
yr
n .1972703538601823 2.6216e-09 deg/d
Q 3.222182750838695 2.8548e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      923  
   data-arc span      7305 days (20.00 yr)  
   first obs. used      1994-10-31  
   last obs. used      2014-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .5195  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Nov-10 13:39:30  

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 13.7 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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