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 ]  
154987 (2004 WJ4)
Classification: Main-belt Asteroid          SPK-ID: 2154987
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07841151684291432 4.8993e-08  
a 2.977461744243348 2.5808e-08 au
q 2.743994452535477 1.4545e-07 au
i 3.152685754836205 4.9036e-06 deg
node 68.51625702723568 8.708e-05 deg
peri 277.4527291913695 9.3125e-05 deg
M 72.02561409062494 3.0662e-05 deg
tp 2458625.049937344704
(2019-May-21.54993734)
0.00016131 TDB
period 1876.582716613027
5.14
2.4399e-05
6.68e-08
d
yr
n .1918380665093998 2.4942e-09 deg/d
Q 3.210929035951218 2.7831e-08 au
  Orbit Determination Parameters
   # obs. used (total)      573  
   data-arc span      7364 days (20.16 yr)  
   first obs. used      1999-11-09  
   last obs. used      2020-01-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52749  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jan-29 20:06:19  

Additional Information
 Earth MOID = 1.73903 au 
 Jupiter MOID = 2.12201 au 
 T_jup = 3.254 
[ 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 15.3   n/a MPO502914  
rotation period rot_per 6.11 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Chang, C.-K.; Lin, H.-W.; Ip, W.-H.; Prince, T.A.; et al. (2016) Astrophys. J. Sup. Ser. 227, A20.]

154987 (2004 WJ4)          Discovered 2004-Nov-17 by CINEOS at Campo Imperatore
Reference: 20070402/Numbers.arcLast Updated: 2007-04-04

Alternate Designations
 2004 WJ4 = 1999 VS111 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Jun-03 14:09 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin