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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 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1027334753884804 5.8951e-08  
a 2.925874488594125 2.03e-08 au
q 2.625289233830358 1.6819e-07 au
i 1.796977054738272 5.9364e-06 deg
node 8.116803796246659 0.00014392 deg
peri 37.56751442514349 0.00014713 deg
M 112.0812432512242 2.6668e-05 deg
tp 2457031.368787324881
(2015-Jan-08.86878732)
0.00013563 JED
period 1828.024302904981
5.00
1.9024e-05
5.208e-08
d
yr
n .1969339244713053 2.0495e-09 deg/d
Q 3.226459743357892 2.2385e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1424  
   data-arc span      7841 days (21.47 yr)  
   first obs. used      1994-10-31  
   last obs. used      2016-04-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .49746  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Apr-25 13:37:39  

Additional Information
 Earth MOID = 1.63331 au 
 Jupiter MOID = 2.13362 au 
 T_jup = 3.269 
[ 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 13.9 mag n/a MPO365512  

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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