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
IMPORTANT: The SSD Announcement email list is now available. Major changes are coming in the near future, including possible hostname and/or URL changes. To be notified of such changes, subscribe to this email list.

Please visit this page for more details.


JPL Small-Body Database Browser
Search: [ help ]  
243678 (1999 WH20)
Classification: Main-belt Asteroid          SPK-ID: 2243678
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1608309006633669 2.3935e-07  
a 2.545457530563879 2.3594e-08 au
q 2.136069303322941 6.2718e-07 au
i 26.77607080236667 5.8464e-06 deg
node 238.2937664641449 1.0796e-05 deg
peri 170.57915194606 1.9178e-05 deg
M 288.4726085144008 1.9966e-05 deg
tp 2458895.225081519840
(2020-Feb-15.72508152)
8.5298e-05 TDB
period 1483.362207728546
4.06
2.0624e-05
5.647e-08
d
yr
n .2426919050009125 3.3743e-09 deg/d
Q 2.954845757804817 2.7389e-08 au
  Orbit Determination Parameters
   # obs. used (total)      684  
   data-arc span      7333 days (20.08 yr)  
   first obs. used      1999-10-14  
   last obs. used      2019-11-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46143  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-04 18:27:35  

Additional Information
 Earth MOID = 1.14953 au 
 Jupiter MOID = 2.42512 au 
 T_jup = 3.277 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.8   n/a MPO300152  
diameter diameter 5.253 km 0.385 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.037   0.003 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

243678 (1999 WH20)          Discovered 1999-Nov-16 by LINEAR at Socorro
Reference: 20100726/Numbers.arcLast Updated: 2010-07-28
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2019-Dec-10 22:13 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin