Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Near-Earth Object (NEO) Program
Search JPL
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
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 5 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1025255697275708 7.7929e-08  
a 2.922546999919837 3.3757e-08 AU
q 2.622911203697452 2.3176e-07 AU
i 1.797698672457061 8.3924e-06 deg
node 8.10169961681251 0.00018251 deg
peri 36.87521947717723 0.00018593 deg
M 354.4933421381912 3.6098e-05 deg
tp 2457028.414270082531
(2015-Jan-05.91427008)
0.00018324 JED
period 1824.90677320023
5.00
3.1618e-05
8.657e-08
d
yr
n .197270351169057 3.4179e-09 deg/d
Q 3.222182796142221 3.7218e-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 = 1.63195 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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2014-Sep-17 05:33 UT
(server date/time)  
NASA Home Page
Site Manager:   Donald K. Yeomans
Webmaster  Alan B. Chamberlin