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109904 (2001 ST21)
Classification: Main-belt Asteroid          SPK-ID: 2109904
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 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1480171744511723 2.8328e-08  
a 2.5396875611801 1.1399e-08 au
q 2.163770184385432 6.97e-08 au
i 4.760058150722247 3.2089e-06 deg
node 84.76964689493394 0.00011141 deg
peri .3807364542664763 0.00011884 deg
M 167.1977043657737 4.4745e-05 deg
tp 2458313.911264036535
(2018-Jul-14.41126404)
0.0001825 TDB
period 1478.321403301784
4.05
9.9529e-06
2.725e-08
d
yr
n .2435194398159639 1.6395e-09 deg/d
Q 2.915604937974766 1.3086e-08 au
  Orbit Determination Parameters
   # obs. used (total)      828  
   data-arc span      7321 days (20.04 yr)  
   first obs. used      1999-04-12  
   last obs. used      2019-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5699  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-13 07:33:04  

Additional Information
 Earth MOID = 1.17996 au 
 Jupiter MOID = 2.29315 au 
 T_jup = 3.426 
[ 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 15.4   n/a MPO469126  

109904 (2001 ST21)          Discovered 2001-Sep-16 by LINEAR at Socorro
Reference: 20051019/Numbers.arcLast Updated: 2005-10-26
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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