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469674 (2004 XK21)
Classification: Main-belt Asteroid          SPK-ID: 2469674
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2954054078136029 1.7386e-07  
a 2.577250205380854 5.2302e-08 au
q 1.815916557422631 4.8275e-07 au
i 4.472365127550163 6.1221e-06 deg
node 248.9141271750541 0.00012219 deg
peri 132.6538839140863 0.00012886 deg
M 344.8143631850079 5.047e-05 deg
tp 2459264.247595669797
(2021-Feb-18.74759567)
0.00021374 TDB
period 1511.239516703723
4.14
4.6003e-05
1.259e-07
d
yr
n .2382150519629229 7.2514e-09 deg/d
Q 3.338583853339078 6.7753e-08 au
  Orbit Determination Parameters
   # obs. used (total)      152  
   data-arc span      5845 days (16.00 yr)  
   first obs. used      2004-12-02  
   last obs. used      2020-12-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .60889  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 18:13:28  

Additional Information
 Earth MOID = .821525 au 
 Jupiter MOID = 2.14603 au 
 T_jup = 3.360 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457717.5 (2016-Nov-25.0) TDB
Reference: JPL 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2977136407378913 1.7172e-07  
q 1.809010483392201 4.7614e-07 au
tp 2457754.335142575007
(2016-Dec-31.83514258)
0.00016785 TDB
node 248.9506467636036 0.0001221 deg
peri 132.7963034923852 0.00012867 deg
i 4.476112630182851 6.1239e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      152  
   data-arc span      5845 days (16.00 yr)  
   first obs. used      2004-12-02  
   last obs. used      2020-12-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .60889  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 18:13:28  

Additional Information
 Jupiter MOID = 2.14603 au 
 T_jup = 3.360 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.948677059581065E-14 -8.173259620806578E-14 -2.668400935142664E-11 -3.184891629579813E-13 -6.170289974245297E-12 -1.162720110744165E-13
q -8.173259620806578E-14 2.267076771170331E-13 7.443452317192979E-11 8.766098140473617E-13 1.723854423633882E-11 3.235041728880887E-13
tp -2.668400935142664E-11 7.443452317192979E-11 2.817493572131685E-8 2.270657227817114E-10 6.884828590504671E-9 1.129627776975658E-10
node -3.184891629579813E-13 8.766098140473617E-13 2.270657227817114E-10 1.490788858633426E-8 -1.481232514371062E-8 2.087572773826835E-10
peri -6.170289974245297E-12 1.723854423633882E-11 6.884828590504671E-9 -1.481232514371062E-8 1.655491276634794E-8 -1.800995796752799E-10
i -1.162720110744165E-13 3.235041728880887E-13 1.129627776975658E-10 2.087572773826835E-10 -1.800995796752799E-10 3.750206708471663E-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 17.31   n/a E2021B25  

469674 (2004 XK21)          Discovered 2004-Dec-08 by LINEAR at Socorro
Reference: Last Updated: 2016-08-22

Alternate Designations
 2004 XK21 = 2008 US203 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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