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
IMPORTANT: The SSD Announcement email list is now available. Major changes are coming in the near future, including possible hostname and/or URL changes. To be notified of such changes, subscribe to this email list.

Please visit this page for more details.


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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07226743817334459 4.8458e-08  
a 5.24261431823555 9.9309e-08 au
q 4.863744012125772 3.0534e-07 au
i 30.82893231208879 5.5589e-06 deg
node 213.2225066791962 8.9074e-06 deg
peri 64.82643215204693 5.1402e-05 deg
M 273.1550405049697 5.6216e-05 deg
tp 2459658.199762833617
(2022-Mar-19.69976283)
0.0007016 TDB
period 4384.502184515289
12.00
0.00012458
3.411e-07
d
yr
n .0821073829707302 2.333e-09 deg/d
Q 5.621484624345329 1.0649e-07 au
  Orbit Determination Parameters
   # obs. used (total)      1641  
   data-arc span      8448 days (23.13 yr)  
   first obs. used      1996-03-24  
   last obs. used      2019-05-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49402  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-30 02:02:27  

Additional Information
 Earth MOID = 3.95021 au 
 Jupiter MOID = .391093 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-January); 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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Jan-20 00:31 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin