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JPL Small-Body Database Browser
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121725 Aphidas (1999 XX143)
Classification: Centaur          SPK-ID: 2121725
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 5 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4656447752065992 5.8755e-05  
a 17.92251842182559 0.0014495 au
q 9.57699136015848 0.0018257 au
i 6.785303284661455 0.0003497 deg
node 103.91522819717 0.0010374 deg
peri 215.7312691958936 0.0039061 deg
M 221.5507260036685 0.01373 deg
tp 2469658.731818786204
(2049-Aug-05.23181879)
2.314 TDB
period 27713.85753069894
75.88
3.3622
0.009205
d
yr
n .01298989141447466 1.5759e-06 deg/d
Q 26.2680454834927 0.0021245 au
  Orbit Determination Parameters
   # obs. used (total)      30  
   data-arc span      5935 days (16.25 yr)  
   first obs. used      1999-12-13  
   last obs. used      2016-03-13  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      4  
   norm. resid. RMS      .39283  
   source      ORB  
   producer      Otto Matic  
   solution date      2017-Apr-11 11:14:22  

Additional Information
 Earth MOID = 8.56676 au 
 Jupiter MOID = 4.5323 au 
 T_jup = 3.552 
[ 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 8.6   n/a MPO90854  

121725 Aphidas           Discovered 1999 Dec. 13 by C. W. Hergenrother at Mount Hopkins.
During the battle between the Centaurs and Lapiths, the centaur Aphidas remained in a drunken sleep. The Lapith Phorbas killed Aphidas with a thrown spear while he slept.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC batch dated 2017-10-05Last Updated: 2017-10-09
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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