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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 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07189500577771746 5.7605e-08  
a 2.812165516285252 2.5527e-08 au
q 2.609984860244026 1.5955e-07 au
i 3.260976698279881 6.4442e-06 deg
node 222.7063473754621 0.00010795 deg
peri 85.81991089617715 0.00011688 deg
M 147.3293664621738 4.4871e-05 deg
tp 2458295.569071999332
(2018-Jun-26.06907200)
0.00021422 TDB
period 1722.502038623755
4.72
2.3454e-05
6.421e-08
d
yr
n .2089983012662399 2.8457e-09 deg/d
Q 3.014346172326478 2.7362e-08 au
  Orbit Determination Parameters
   # obs. used (total)      167  
   data-arc span      8827 days (24.17 yr)  
   first obs. used      1995-10-19  
   last obs. used      2019-12-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .60476  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 13:14:44  

Additional Information
 Earth MOID = 1.59787 au 
 Jupiter MOID = 2.1528 au 
 T_jup = 3.314 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457195.5 (2015-Jun-22.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07410750640019044 5.7988e-08  
q 2.601848041927847 1.6095e-07 au
tp 2456568.383739344338
(2013-Oct-02.88373934)
0.00020644 TDB
node 222.8347805894729 0.00010828 deg
peri 84.59182549566614 0.00011654 deg
i 3.255134999025587 6.4392e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      167  
   data-arc span      8827 days (24.17 yr)  
   first obs. used      1995-10-19  
   last obs. used      2019-12-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .60476  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 13:14:44  

Additional Information
 Jupiter MOID = 2.1528 au 
 T_jup = 3.314 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.362580639765637E-15 -9.235991159064137E-15 4.156325079070648E-14 -2.223770894713998E-15 -6.651830738644055E-14 -2.293030509642674E-15
q -9.235991159064137E-15 2.590544474117254E-14 -4.493857393766153E-13 1.062244539656432E-14 1.49908211093638E-13 7.046026183960943E-15
tp 4.156325079070648E-14 -4.493857393766153E-13 4.261580446512589E-8 7.497413105406084E-11 8.928514874771621E-9 -1.276018593872003E-12
node -2.223770894713998E-15 1.062244539656432E-14 7.497413105406084E-11 1.172556324633042E-8 -1.16902125274024E-8 -1.395945885250612E-11
peri -6.651830738644055E-14 1.49908211093638E-13 8.928514874771621E-9 -1.16902125274024E-8 1.358245139279979E-8 1.373580108680098E-11
i -2.293030509642674E-15 7.046026183960943E-15 -1.276018593872003E-12 -1.395945885250612E-11 1.373580108680098E-11 4.146348405382031E-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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