Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Near-Earth Object (NEO) Program
Search JPL
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
30698 Hippokoon (2299 T-3)
Classification: Jupiter Trojan          SPK-ID: 2030698
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2456800.5 (2014-May-23.0) TDB
Reference: JPL 9 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06340714745163889 9.4691e-08  
a 5.190100485997785 1.586e-07 AU
q 4.861011019193301 5.3421e-07 AU
i 7.870836348224782 1.2247e-05 deg
node 216.2527694600628 6.6728e-05 deg
peri 102.178247339979 0.00012423 deg
M 79.34418989408125 9.9242e-05 deg
tp 2455848.636429411019
(2011-Oct-14.13642941)
0.001202 JED
period 4318.789893368045
11.82
0.00019796
5.42e-07
d
yr
n .08335668298029912 3.8207e-09 deg/d
Q 5.51918995280227 1.6865e-07 AU
  Orbit Determination Parameters
   # obs. used (total)      538  
   data-arc span      13283 days (36.37 yr)  
   first obs. used      1977-10-07  
   last obs. used      2014-02-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .60558  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Mar-22 11:28:43  

Additional Information
 Earth MOID = 3.85838 AU 
 T_jup = 2.977 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.0 mag n/a MPO272787  

30698 Hippokoon           Discovered 1977 Oct. 16 by C. J. van Houten and I. van Houten-Groeneveld on Palomar Schmidt plates taken by T. Gehrels.
Hippokoon was a friend of king Rhesos, from Thracia. Hippokoon and the other Thracians were fast asleep as Odysseus and Diomedes killed king Rhesus and his 12 companions. Only Hippokoon was awoken by the god Apollo.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20030318/MPCPages.arcLast Updated: 2003-10-02

Alternate Designations
 2299 T-3 = 2000 QM89 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2014-Apr-24 22:30 UT
(server date/time)  
NASA Home Page
Site Manager:   Donald K. Yeomans
Webmaster  Alan B. Chamberlin