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JPL Small-Body Database Browser
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12444 Prothoon (1996 GE19)
Classification: Jupiter Trojan          SPK-ID: 2012444
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 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07262321641542226 4.7701e-08  
a 5.24131314787368 8.4134e-08 au
q 4.860672128834652 2.9893e-07 au
i 30.83327817073989 5.4722e-06 deg
node 213.2203886184227 7.659e-06 deg
peri 65.13203198696985 4.2707e-05 deg
M 305.7507585680866 4.538e-05 deg
tp 2459660.964923523210
(2022-Mar-22.46492352)
0.00055845 TDB
period 4382.869993984526
12.00
0.00010553
2.889e-07
d
yr
n .0821379599427085 1.9777e-09 deg/d
Q 5.621954166912709 9.0244e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1902  
   data-arc span      8801 days (24.10 yr)  
   first obs. used      1996-03-24  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47195  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 03:43:40  

Additional Information
 Earth MOID = 3.94831 au 
 Jupiter MOID = .394264 au 
 T_jup = 2.712 
[ 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 9.9   n/a MPO473935  
diameter diameter 63.835 km 0.844 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
rotation period rot_per 15.82 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[French, L.M.; Stephens, R.D.; Coley, D.R.; Megna, R.; Wasserman, L.H. (2012) Minor Planet Bull. 39, 183-187.]
geometric albedo albedo 0.052   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  

12444 Prothoon           Discovered 1996 Apr. 15 by E. W. Elst at the European Southern Observatory.
Prothoon was a Trojan warrior who was killed by Teucer.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20030106/MPCPages.arcLast Updated: 2003-10-02
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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