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382238 Euphemus (2012 SN9)
Classification: Jupiter Trojan          SPK-ID: 2382238
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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Orbit Diagram
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Note: This Java-based orbit viewer will eventually be retired.

Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances. For accurate long-term ephemerides, please instead use our Horizons system.

Note: If the applet is not working, here are some notes that might help.
Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).

Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07126835138939379 1.4133e-07  
a 5.121537583740073 3.9638e-07 au
q 4.756534043568099 9.4886e-07 au
i 12.44607444329553 1.0328e-05 deg
node 306.772946900924 5.5581e-05 deg
peri 28.45885879123572 0.00012615 deg
M 253.9313910708321 0.00012851 deg
tp 2460247.835679749846
0.001599 TDB
period 4233.494237770308
n .08503613794679554 9.8719e-09 deg/d
Q 5.486541123912047 4.2463e-07 au
  Orbit Determination Parameters
   # obs. used (total)      123  
   data-arc span      6455 days (17.67 yr)  
   first obs. used      2001-09-29  
   last obs. used      2019-06-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .58207  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Sep-24 06:59:28  

Additional Information
 Earth MOID = 3.75161 au 
 Jupiter MOID = .135757 au 
 T_jup = 2.949 
[ 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 13.3   n/a MPO476790  

382238 Euphemus           Discovered 2011 July 8 by L. Elenin at Mayhill-ISON.
Euphemus, son of Troezenus, was a leader of the Thracian Cicones, and an ally of the Trojans. He was killed either by Achilles or by one of the following four: Diomedes, Idomeneus and the two Ajaxes.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC batch dated 2014-01-16Last Updated: 2014-01-21
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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