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102913 (1999 XT21)
Classification: Main-belt Asteroid          SPK-ID: 2102913
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2216816903677664 3.055e-08  
a 2.60744418479249 1.2468e-08 au
q 2.029421550368088 7.8742e-08 au
i 7.923690506533413 3.6371e-06 deg
node 159.8440897895686 3.8164e-05 deg
peri 161.5972880861113 3.9998e-05 deg
M 77.02427022103502 1.3533e-05 deg
tp 2458871.462005634751
(2020-Jan-22.96200563)
5.6925e-05 TDB
period 1537.874719637919
4.21
1.1031e-05
3.02e-08
d
yr
n .2340892892008519 1.679e-09 deg/d
Q 3.185466819216892 1.5232e-08 au
  Orbit Determination Parameters
   # obs. used (total)      571  
   data-arc span      7705 days (21.10 yr)  
   first obs. used      1999-12-05  
   last obs. used      2021-01-08  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .57257  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 08:32:45  

Additional Information
 Earth MOID = 1.01693 au 
 Jupiter MOID = 2.16946 au 
 T_jup = 3.363 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.8   n/a MPO493578  

102913 (1999 XT21)          Discovered 1999-Dec-05 by LINEAR at Socorro
Reference: 20051019/Numbers.arcLast Updated: 2005-10-26

[ show close-approach data ]
Alternate Designations
 1999 XT21 = 2003 UK81 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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