+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   15094 Polymele (1999 WB2) Classification: Jupiter Trojan          SPK-ID: 2015094 [ 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 16 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .09520975383184067 4.3317e-08   a 5.170434470868143 1.1435e-07 au q 4.678158677693124 3.1857e-07 au i 12.98885531210454 2.2579e-06 deg node 50.32266130756343 1.293e-05 deg peri 4.299956207867912 2.1329e-05 deg M 320.9876838617615 1.9324e-05 deg tp 2459465.859108157920 (2021-Sep-08.35910816) 0.0002381 TDB period 4294.266414309217 11.76 0.00014246 3.9e-07 d yr n .08383271210198313 2.7811e-09 deg/d Q 5.662710264043162 1.2524e-07 au   Orbit Determination Parameters    # obs. used (total)      831      data-arc span      10382 days (28.42 yr)      first obs. used      1991-05-04      last obs. used      2019-10-06      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .55508      source      ORB      producer      Ryan S. Park      solution date      2019-Oct-15 10:41:40   Additional Information  Earth MOID = 3.68973 au   Jupiter MOID = .23162 au   T_jup = 2.940  [ 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 11.8   n/a MPO492919   magnitude slope G 0.22   0.02 [Buie, M. W. et al. (2018) AJ 155, Issue 6, article id. 245]   diameter diameter 21.075 km 0.136 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)   rotation period rot_per 5.8607 h 0.0005 [Buie, M. W. et al. (2018) AJ 155, Issue 6, article id. 245]   geometric albedo albedo 0.091   0.017 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)   15094 Polymele           Discovered 1999 Nov. 17 by the Catalina Sky Survey. Polymele is identified, according to Gaius Julius Hyginus (c. 64 B.C.E.--17 C.E.), as the wife of Menoetius and the mother of Patroclus. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: MPC batch dated 2016-02-22 Last Updated: 2016-02-25 Alternate Designations  1999 WB2 = 1997 WR57  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jan-24 22:52 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin