Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
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 | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1056491961191786 3.9225e-08  
a 2.922928888218306 1.2149e-08 au
q 2.614123800864518 1.1447e-07 au
i 1.790319025632357 4.244e-06 deg
node 7.996707529826038 0.00010202 deg
peri 38.55849588554695 0.00010383 deg
M 66.59973599284992 1.7548e-05 deg
tp 2458862.827410711284
(2020-Jan-14.32741071)
8.8925e-05 TDB
period 1825.264474877026
5.00
1.138e-05
3.116e-08
d
yr
n .1972316916014346 1.2296e-09 deg/d
Q 3.231733975572094 1.3432e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2086  
   data-arc span      9579 days (26.23 yr)  
   first obs. used      1994-10-31  
   last obs. used      2021-01-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48704  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:54:30  

Additional Information
 Earth MOID = 1.62301 au 
 Jupiter MOID = 2.12321 au 
 T_jup = 3.270 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.85   n/a E2021B10  

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 | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Apr-10 12:53 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin