+ 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 2459000.5 (2020-May-31.0) TDB Reference: JPL 21 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .02072567131046541 5.1822e-08   a 5.144425744198539 9.929e-08 au q 5.037804067143184 3.2695e-07 au i 26.41296452111643 5.4856e-06 deg node 219.3414974314381 1.04e-05 deg peri 213.70525399 0.00014846 deg M 261.7017628673861 0.00015165 deg tp 2460164.216011450519 (2023-Aug-07.71601145) 0.0018136 TDB period 4261.905160689696 11.67 0.00012339 3.378e-07 d yr n .08446926583925717 2.4455e-09 deg/d Q 5.251047421253894 1.0135e-07 au   Orbit Determination Parameters    # obs. used (total)      1360      data-arc span      11613 days (31.79 yr)      first obs. used      1989-01-08      last obs. used      2020-10-25      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .49744      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 02:49:44   Additional Information  Earth MOID = 4.06021 au   Jupiter MOID = .0691006 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 11.4   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.arc Last Updated: 2008-11-17 Alternate Designations  1998 TL15 = 1986 TL7  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Nov-30 18:12 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin