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JPL Small-Body Database Browser
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154916 (2004 SJ21)
Classification: Main-belt Asteroid          SPK-ID: 2154916
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 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07189503351512716 5.7761e-08  
a 2.81216551689074 2.5603e-08 au
q 2.609984782803795 1.6014e-07 au
i 3.260976249830245 6.4568e-06 deg
node 222.7062947601405 0.00010869 deg
peri 85.81992937585615 0.00011762 deg
M 147.3293969617277 4.4944e-05 deg
tp 2458295.568925839597
(2018-Jun-26.06892584)
0.00021461 TDB
period 1722.502039180064
4.72
2.3523e-05
6.44e-08
d
yr
n .2089983011987407 2.8542e-09 deg/d
Q 3.014346250977685 2.7443e-08 au
  Orbit Determination Parameters
   # obs. used (total)      163  
   data-arc span      8812 days (24.13 yr)  
   first obs. used      1995-10-19  
   last obs. used      2019-12-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .64011  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-14 12:05:13  

Additional Information
 Earth MOID = 1.59787 au 
 Jupiter MOID = 2.1528 au 
 T_jup = 3.314 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457179.5 (2015-Jun-06.0) TDB
Reference: JPL 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07411566324439217 5.8142e-08  
q 2.601811470711862 1.6154e-07 au
tp 2456568.390094678860
(2013-Oct-02.89009468)
0.00020691 TDB
node 222.8349965611422 0.00010903 deg
peri 84.59124803611054 0.00011728 deg
i 3.255152451149306 6.4518e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      163  
   data-arc span      8812 days (24.13 yr)  
   first obs. used      1995-10-19  
   last obs. used      2019-12-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .64011  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-14 12:05:13  

Additional Information
 Jupiter MOID = 2.1528 au 
 T_jup = 3.314 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.380478852152223E-15 -9.294168976280514E-15 1.030068570795406E-13 -1.410722067648863E-15 -5.363664383915193E-14 -2.330509626650673E-15
q -9.294168976280514E-15 2.609440870749535E-14 -6.508545278492257E-13 8.277620963641582E-15 1.07323194837547E-13 7.162256013211832E-15
tp 1.030068570795406E-13 -6.508545278492257E-13 4.281261264042559E-8 7.306072009474748E-11 8.974383132674583E-9 -1.24849960059019E-12
node -1.410722067648863E-15 8.277620963641582E-15 7.306072009474748E-11 1.188849590440417E-8 -1.185330516857257E-8 -1.910185039313466E-11
peri -5.363664383915193E-14 1.07323194837547E-13 8.974383132674583E-9 -1.185330516857257E-8 1.375551610044727E-8 1.887621511736777E-11
i -2.330509626650673E-15 7.162256013211832E-15 -1.24849960059019E-12 -1.910185039313466E-11 1.887621511736777E-11 4.162612642820606E-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 16.6   n/a MPO454007  

154916 (2004 SJ21)          Discovered 2004-Sep-16 by Spacewatch at Kitt Peak
Reference: 20070402/Numbers.arcLast Updated: 2007-04-04

Alternate Designations
 2004 SJ21 = 1995 UK20 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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