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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 
[ 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 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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