+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   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 2459396.5 (2021-Jul-01.0) TDB Reference: JPL 25 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .02138173394265076 5.0425e-08   a 5.141942797243115 9.8131e-08 au q 5.031999144404134 3.2135e-07 au i 26.41953795787068 5.2809e-06 deg node 219.3248421672308 1.0275e-05 deg peri 215.2632835432883 0.00014531 deg M 293.7036386890633 0.00014897 deg tp 2460180.789643483937 (2023-Aug-24.28964348) 0.0017747 TDB period 4258.820032821919 11.66 0.00012192 3.338e-07 d yr n .08453045614173602 2.4198e-09 deg/d Q 5.251886450082097 1.0023e-07 au   Orbit Determination Parameters    # obs. used (total)      1456      data-arc span      11719 days (32.08 yr)      first obs. used      1989-01-08      last obs. used      2021-02-08      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .49331      source      ORB      producer      Otto Matic      solution date      2021-Apr-12 23:39:01   Additional Information  Earth MOID = 4.05547 au   Jupiter MOID = .0675996 au   T_jup = 2.792  [ 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 11.45   n/a E2021B10   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.arc Last Updated: 2008-11-17 Alternate Designations  1998 TL15 = 1986 TL7  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jul-26 04:44 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin