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JPL Small-Body Database Browser
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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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457166.5 (2015-May-24.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .080752887301976 4.9324e-08  
q 2.735195395789939 1.4625e-07 au
tp 2456735.398058671022
(2014-Mar-18.89805867)
0.00016432 TDB
node 68.61793509119281 8.7264e-05 deg
peri 274.9648580216531 9.2905e-05 deg
i 3.151062780964221 4.8969e-06 deg
  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
 Jupiter MOID = 2.12201 au 
 T_jup = 3.254 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.432857149271467E-15 -7.121729506943148E-15 2.127431863821014E-12 -1.78503833550741E-14 3.626176531592001E-13 -1.040145221041902E-16
q -7.121729506943148E-15 2.138911691056572E-14 -7.954577767269313E-12 5.194647313733445E-14 -1.376536274519198E-12 9.324117499335996E-16
tp 2.127431863821014E-12 -7.954577767269313E-12 2.700161159656467E-8 -3.134985089063078E-11 5.265928771732499E-9 -2.94265286620771E-12
node -1.78503833550741E-14 5.194647313733445E-14 -3.134985089063078E-11 7.614936519620554E-9 -7.608965964201701E-9 -1.710099065010379E-10
peri 3.626176531592001E-13 -1.376536274519198E-12 5.265928771732499E-9 -7.608965964201701E-9 8.631247975687988E-9 1.701780839237716E-10
i -1.040145221041902E-16 9.324117499335996E-16 -2.94265286620771E-12 -1.710099065010379E-10 1.701780839237716E-10 2.397984689677618E-11

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 ]
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