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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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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer 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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07153907396836265 1.25e-07  
a 5.120868569663925 3.8083e-07 au
q 4.754526374276473 9.1739e-07 au
i 12.44609437604902 8.0583e-06 deg
node 306.7727771704133 5.334e-05 deg
peri 28.53539845148027 0.00011299 deg
M 270.8921236640349 0.00011283 deg
tp 2460248.177130423402
(2023-Oct-30.67713042)
0.0013932 TDB
period 4232.664748180028
11.59
0.00047216
1.293e-06
d
yr
n .08505280276563215 9.4879e-09 deg/d
Q 5.487210765051375 4.0807e-07 au
  Orbit Determination Parameters
   # obs. used (total)      135  
   data-arc span      6808 days (18.64 yr)  
   first obs. used      2001-09-29  
   last obs. used      2020-05-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .56542  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-14 10:53:23  

Additional Information
 Earth MOID = 3.74774 au 
 Jupiter MOID = .135917 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 13.41   n/a E2021B25  

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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