Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP

Significant website upgrade scheduled for September 27. More details available here.

JPL Small-Body Database Browser
Search: [ help ]  
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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 43 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07264709496895168 1.9962e-08  
a 5.239520573394879 6.7852e-08 au
q 4.858884624707684 1.5295e-07 au
i 30.83900548914176 1.2481e-06 deg
node 213.2244977289849 2.0322e-06 deg
peri 65.55698385661375 1.4695e-05 deg
M 337.9042067669771 1.6094e-05 deg
tp 2459665.370310253391
(2022-Mar-26.87031025)
0.00019607 TDB
period 4380.621717013538
11.99
8.5094e-05
2.33e-07
d
yr
n .08218011580452735 1.5964e-09 deg/d
Q 5.620156522082073 7.2781e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2505  
   data-arc span      9266 days (25.37 yr)  
   first obs. used      1996-03-24  
   last obs. used      2021-08-06  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43128  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 20:49:50  

Additional Information
 Earth MOID = 3.94795 au 
 Jupiter MOID = .395877 au 
 T_jup = 2.712 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457519.5 (2016-May-11.0) TDB
Reference: JPL 43 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07080899559089593 1.9953e-08  
q 4.876414283145356 1.5331e-07 au
tp 2459661.193362713386
(2022-Mar-22.69336271)
0.00019978 TDB
node 213.2212516575746 2.0317e-06 deg
peri 64.74643282551463 1.4982e-05 deg
i 30.82634628802217 1.2481e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2505  
   data-arc span      9266 days (25.37 yr)  
   first obs. used      1996-03-24  
   last obs. used      2021-08-06  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43128  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 20:49:50  

Additional Information
 Jupiter MOID = .395877 au 
 T_jup = 2.712 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.981081446890676E-16 -2.896753937099483E-15 -5.075152401379915E-13 5.405500111469688E-15 -1.281047124653683E-14 1.591020611914047E-15
q -2.896753937099483E-15 2.350357599147898E-14 3.374886247274243E-12 -2.946834378541979E-14 -7.435677271230626E-14 -8.636179360810839E-15
tp -5.075152401379915E-13 3.374886247274243E-12 3.99139504806875E-8 -2.531500420634215E-11 2.905848574011756E-9 -1.118477002777732E-11
node 5.405500111469688E-15 -2.946834378541979E-14 -2.531500420634215E-11 4.127869040638609E-12 -5.360637596343264E-12 2.292523090060797E-12
peri -1.281047124653683E-14 -7.435677271230626E-14 2.905848574011756E-9 -5.360637596343264E-12 2.244520704084747E-10 -2.811230174332291E-12
i 1.591020611914047E-15 -8.636179360810839E-15 -1.118477002777732E-11 2.292523090060797E-12 -2.811230174332291E-12 1.557736739677586E-12

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 9.98   n/a MPCxxxxx  
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. 2020-October); 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.]
[Stephens, R.D.; Warner, B.D. (2020) Minor Planet Bull. 47, 285-289.]
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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Sep-26 23:01 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin