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JPL Small-Body Database Browser
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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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .01987815208723247 6.4963e-08  
a 5.147370616450666 1.1398e-07 au
q 5.045050400487509 3.5898e-07 au
i 26.411800829624 7.5649e-06 deg
node 219.3638755426252 1.1134e-05 deg
peri 213.0328473546785 0.00015568 deg
M 228.5044443976465 0.00015896 deg
tp 2460158.563519521914
(2023-Aug-02.06351952)		 0.001911 TDB
period 4265.565208333549
11.68		 0.00014168
3.879e-07		 d
yr
n .08439678739330375 2.8033e-09 deg/d
Q 5.249690832413823 1.1625e-07 au
   Orbit Determination Parameters
   # obs. used (total)      917  
   data-arc span      11250 days (30.80 yr)  
   first obs. used      1989-01-08  
   last obs. used      2019-10-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5845  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 03:39:17  

Additional Information
 Earth MOID = 4.06605 au 
 Jupiter MOID = .0747073 au 
 T_jup = 2.792 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456505.5 (2013-Aug-01.0) TDB
Reference: JPL 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .01876695102112173 6.0727e-08  
q 5.079947353116829 3.3593e-07 au
tp 2456032.751080315283
(2012-Apr-15.25108032)		 0.0021341 TDB
node 219.4692660895198 1.1119e-05 deg
peri 225.4276042405171 0.00017915 deg
i 26.3647112450126 7.5631e-06 deg
   Orbit Determination Parameters
   # obs. used (total)      917  
   data-arc span      11250 days (30.80 yr)  
   first obs. used      1989-01-08  
   last obs. used      2019-10-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5845  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 03:39:17  

Additional Information
 Jupiter MOID = .0747073 au 
 T_jup = 2.792 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.687798115225084E-15 -1.915222271985751E-14 -4.266038957519614E-11 -8.879047347078283E-16 -3.636709691977146E-12 3.837965348160164E-15
q -1.915222271985751E-14 1.12849795771623E-13 3.355472025801716E-10 2.657193568513709E-14 2.854748725017414E-11 2.008068441572161E-14
tp -4.266038957519614E-11 3.355472025801716E-10 4.554457555111058E-6 5.456923316033837E-11 3.816191868118331E-7 2.582145229822157E-10
node -8.879047347078283E-16 2.657193568513709E-14 5.456923316033837E-11 1.236374015994595E-10 -1.055283508516546E-10 1.169506422763665E-11
peri -3.636709691977146E-12 2.854748725017414E-11 3.816191868118331E-7 -1.055283508516546E-10 3.209511106514151E-8 1.194086757660428E-11
i 3.837965348160164E-15 2.008068441572161E-14 2.582145229822157E-10 1.169506422763665E-11 1.194086757660428E-11 5.720113007410537E-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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