+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   21602 Ialmenus (1998 YW1) Classification: Jupiter Trojan          SPK-ID: 2021602 [ 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 21 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .06030956995105648 5.3929e-08   a 5.212201966961734 1.1663e-07 au q 4.897856307836221 3.0625e-07 au i 7.939078873448267 5.4794e-06 deg node 309.3087384353445 4.5058e-05 deg peri 193.7822006356525 7.4144e-05 deg M 259.1894259417134 6.2959e-05 deg tp 2460613.621313493720 (2024-Oct-30.12131349) 0.00078851 TDB period 4346.405889965488 11.90 0.00014589 3.994e-07 d yr n .08282705506890856 2.7801e-09 deg/d Q 5.526547626087247 1.2366e-07 au   Orbit Determination Parameters    # obs. used (total)      721      data-arc span      13641 days (37.35 yr)      first obs. used      1983-10-08      last obs. used      2021-02-11      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .51276      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 03:50:05   Additional Information  Earth MOID = 3.91193 au   Jupiter MOID = .350203 au   T_jup = 2.977  [ 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 12.13   n/a MPCxxxxx   diameter diameter 16.353 km 1.174 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2011ApJ...742...40G)   geometric albedo albedo 0.151   0.038 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2011ApJ...742...40G)   21602 Ialmenus           Discovered 1998 Dec. 17 by M. Tichy and Z. Moravec at Klet. Ialmenus was one of the Achaean leaders and one of those who entered Troy in the Wooden Horse. He was the son of Ares and Astyoche. He is counted among the Argonauts and the suitors of Helen. The citation was prepared by J. Ticha. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20010509/MPCPages.arc Last Updated: 2009-05-11 Alternate Designations  1998 YW1 = 1989 AD5  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Aug-01 06:00 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin