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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 10 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2957986806709811 2.6263e-07  
a 2.57855619389388 7.3012e-08 au
q 1.815822673704084 7.2567e-07 au
i 4.473347178606647 7.2824e-06 deg
node 248.9352575420579 0.0001713 deg
peri 132.599015939159 0.00017891 deg
M 297.2472539704542 6.7328e-05 deg
tp 2459264.129230306827
(2021-Feb-18.62923031)
0.00029374 TDB
period 1512.3883641008
4.14
6.4235e-05
1.759e-07
d
yr
n .2380340979507867 1.011e-08 deg/d
Q 3.341289714083677 9.4609e-08 au
  Orbit Determination Parameters
   # obs. used (total)      127  
   data-arc span      4797 days (13.13 yr)  
   first obs. used      2004-12-02  
   last obs. used      2018-01-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .61042  
   source      ORB  
   producer      Otto Matic  
   solution date      2018-Feb-06 09:57:05  

Additional Information
 Earth MOID = .822714 au 
 Jupiter MOID = 2.14231 au 
 T_jup = 3.359 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456833.5 (2014-Jun-25.0) TDB
Reference: JPL 10 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2976979362319694 2.5893e-07  
q 1.808435923340774 7.126e-07 au
tp 2456245.491342113434
(2012-Nov-13.99134211)
0.00017354 TDB
node 248.9612146165035 0.00017125 deg
peri 132.887927709736 0.00017882 deg
i 4.476635937164824 7.2922e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      127  
   data-arc span      4797 days (13.13 yr)  
   first obs. used      2004-12-02  
   last obs. used      2018-01-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .61042  
   source      ORB  
   producer      Otto Matic  
   solution date      2018-Feb-06 09:57:05  

Additional Information
 Jupiter MOID = 2.14231 au 
 T_jup = 3.359 
Orbit Covariance (6×6)
  e q tp node peri i
e 6.704283415336207E-14 -1.844571950690076E-13 -4.176019530126206E-11 -1.579534489954779E-12 -1.232061444965059E-11 -3.010457582959751E-13
q -1.844571950690076E-13 5.077996694255432E-13 1.152362950053656E-10 4.346738691377667E-12 3.402315974043031E-11 8.302075784528216E-13
tp -4.176019530126206E-11 1.152362950053656E-10 3.011612463732218E-8 9.570852917536309E-10 9.177978671958735E-9 1.975101164686263E-10
node -1.579534489954779E-12 4.346738691377667E-12 9.570852917536309E-10 2.93272237321561E-8 -2.892333546676745E-8 -1.228512376458465E-10
peri -1.232061444965059E-11 3.402315974043031E-11 9.177978671958735E-9 -2.892333546676745E-8 3.197601308618042E-8 1.88720822515391E-10
i -3.010457582959751E-13 8.302075784528216E-13 1.975101164686263E-10 -1.228512376458465E-10 1.88720822515391E-10 5.317565174419259E-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 17.3   n/a MPO437769  

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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