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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.


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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
(2023-Oct-30.33567975)
0.001599 TDB
period 4233.494237770308
11.59
0.00049147
1.346e-06
d
yr
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 
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Orbital Elements at Epoch 2457759.5 (2017-Jan-06.0) TDB
Reference: JPL 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07022005277791614 1.4153e-07  
q 4.765030155269673 9.4907e-07 au
tp 2456023.356512493019
(2012-Apr-05.85651249)
0.001354 TDB
node 306.7591122290442 5.5586e-05 deg
peri 29.26087807880408 0.00012723 deg
i 12.44300933609272 1.0324e-05 deg
  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
 Jupiter MOID = .135757 au 
 T_jup = 2.949 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.002940875997212E-14 -1.257352554549531E-13 5.290156779096611E-11 -5.540605963763764E-14 3.174088915317866E-12 8.191759867257484E-15
q -1.257352554549531E-13 9.00734486972041E-13 -6.852023111556031E-11 2.590983668175179E-13 5.674962792570698E-12 1.923284558949768E-14
tp 5.290156779096611E-11 -6.852023111556031E-11 1.83319786719774E-6 -8.974993788510364E-10 1.542722078444864E-7 1.764570067871224E-10
node -5.540605963763764E-14 2.590983668175179E-13 -8.974993788510364E-10 3.089843225323527E-9 -3.088756087982175E-9 2.230632216251088E-10
peri 3.174088915317866E-12 5.674962792570698E-12 1.542722078444864E-7 -3.088756087982175E-9 1.618774399295583E-8 -2.014380505357702E-10
i 8.191759867257484E-15 1.923284558949768E-14 1.764570067871224E-10 2.230632216251088E-10 -2.014380505357702E-10 1.065835494193535E-10

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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