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229737 Porthos (2007 HO4)
Classification: Main-belt Asteroid          SPK-ID: 2229737
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08029843324951255 5.7566e-08  
a 2.747213598204753 3.061e-08 au
q 2.526616650467155 1.5549e-07 au
i 7.362922526049027 6.0163e-06 deg
node 171.8577614325393 3.8882e-05 deg
peri 190.5211680723158 5.3099e-05 deg
M 173.9428322614035 3.8881e-05 deg
tp 2458196.897822929303
(2018-Mar-19.39782293)
0.00017834 TDB
period 1663.171629347118
4.55
2.7797e-05
7.61e-08
d
yr
n .2164539086933071 3.6177e-09 deg/d
Q 2.96781054594235 3.3068e-08 au
  Orbit Determination Parameters
   # obs. used (total)      265  
   data-arc span      6545 days (17.92 yr)  
   first obs. used      2002-04-18  
   last obs. used      2020-03-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53996  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 02:13:45  

Additional Information
 Earth MOID = 1.52377 au 
 Jupiter MOID = 2.42438 au 
 T_jup = 3.331 
[ 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 16.2   n/a MPO470451  

229737 Porthos           Discovered 2007 Apr. 19 by B. Christophe at Saint-Sulpice.
Porthos, baron du Vallon de Bracieux de Pierrefonds, is a fictional character in Dumas' novels The Three Musketeers, Twenty Years After and The Vicomte de Bragelonne. He and the other two musketeers Athos and Aramis are friends of the novel's protagonist, d´Artagnan.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20100330/MPCPages.arcLast Updated: 2010-04-05

[ show close-approach data ]
Alternate Designations
 2007 HO4 = 2008 PY7 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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