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12916 Eteoneus (1998 TL15)
Classification: Jupiter Trojan          SPK-ID: 2012916
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02072567135758666 5.1545e-08  
a 5.144425744479324 9.8982e-08 au
q 5.037804067175738 3.263e-07 au
i 26.4129646133467 5.409e-06 deg
node 219.3414975202826 1.0359e-05 deg
peri 213.70525412635 0.00014843 deg
M 261.7017626351805 0.00015159 deg
tp 2460164.216014294788
(2023-Aug-07.71601429)		 0.0018128 TDB
period 4261.905161038621
11.67		 0.000123
3.368e-07		 d
yr
n .08446926583234161 2.4379e-09 deg/d
Q 5.251047421782912 1.0103e-07 au
   Orbit Determination Parameters
   # obs. used (total)      1389  
   data-arc span      11635 days (31.85 yr)  
   first obs. used      1989-01-08  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49666  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 02:51:02  

Additional Information
 Earth MOID = 4.06021 au 
 Jupiter MOID = .0691006 au 
 T_jup = 2.792 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457272.5 (2015-Sep-07.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0169620652233334 4.8389e-08  
q 5.079739739841014 3.1184e-07 au
tp 2455983.352111992553
(2012-Feb-25.85211199)		 0.0022774 TDB
node 219.3908569461568 1.0355e-05 deg
peri 221.3198038345782 0.00019159 deg
i 26.38500380208248 5.4053e-06 deg
   Orbit Determination Parameters
   # obs. used (total)      1389  
   data-arc span      11635 days (31.85 yr)  
   first obs. used      1989-01-08  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49666  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 02:51:02  

Additional Information
 Jupiter MOID = .0691006 au 
 T_jup = 2.792 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.34146448004085E-15 -1.451136076381979E-14 -4.800066010125256E-11 -3.356308247616808E-15 -4.041013818849983E-12 -6.256391834358059E-15
q -1.451136076381979E-14 9.724252049541731E-14 3.620894609881346E-10 2.790922765714588E-14 3.068098187827992E-11 6.638757813942419E-14
tp -4.800066010125256E-11 3.620894609881346E-10 5.186509879677671E-6 9.633897589219609E-11 4.356898329002145E-7 5.474293448014113E-10
node -3.356308247616808E-15 2.790922765714588E-14 9.633897589219609E-11 1.072198092878675E-10 -8.728536007183027E-11 -9.592129347154769E-12
peri -4.041013818849983E-12 3.068098187827992E-11 4.356898329002145E-7 -8.728536007183027E-11 3.670495914703339E-8 5.553257500893671E-11
i -6.256391834358059E-15 6.638757813942419E-14 5.474293448014113E-10 -9.592129347154769E-12 5.553257500893671E-11 2.921712873718602E-11

[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 11.4   n/a MPO416851  
diameter diameter 22.289 km 1.618 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
geometric albedo albedo 0.098   0.017 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  

12916 Eteoneus           Discovered 1998 Oct. 13 by the OCA-DLR Asteroid Survey at Caussols.
Eteoneus, the son of Boethous, was King Menelaus of Sparta's weapon-carrier during the Trojan War. He helped Odysseus in his attempts to return home.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20081113/MPCPages.arcLast Updated: 2008-11-17

Alternate Designations
 1998 TL15 = 1986 TL7 
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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