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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 3 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1026623360994143 7.4993e-08  
a 2.923095854969015 3.408e-08 AU
q 2.623004005855381 2.2225e-07 AU
i 1.7976362108609 8.102e-06 deg
node 8.102166725977952 0.00018583 deg
peri 36.81484920588909 0.00018945 deg
M 315.1016726445083 3.6837e-05 deg
tp 2457028.162066593430
(2015-Jan-05.66206659)
0.00018876 JED
period 1825.420874250234
5.00
3.1924e-05
8.74e-08
d
yr
n .1972147930804532 3.449e-09 deg/d
Q 3.223187704082649 3.7579e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      886  
   data-arc span      6826 days (18.69 yr)  
   first obs. used      1994-10-31  
   last obs. used      2013-07-09  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .53607  
   data source      ORB  
   producer      Otto Matic  
   solution date      2013-Aug-05 19:50:36  

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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