+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   11552 Boucolion (1993 BD4) Classification: Jupiter Trojan          SPK-ID: 2011552 [ 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 36 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1524282704200063 4.0182e-08   a 5.270689302934485 8.5821e-08 au q 4.467287248566953 2.5826e-07 au i 14.67880210482608 3.7117e-06 deg node 138.3628260450654 1.7923e-05 deg peri 182.17909231 2.4896e-05 deg M 285.7374584013119 2.0149e-05 deg tp 2459912.231288366789 (2022-Nov-28.73128837) 0.00025577 TDB period 4419.768792532714 12.10 0.00010795 2.956e-07 d yr n .08145222451641071 1.9894e-09 deg/d Q 6.074091357302018 9.8902e-08 au   Orbit Determination Parameters    # obs. used (total)      2219      data-arc span      10108 days (27.67 yr)      first obs. used      1993-01-27      last obs. used      2020-09-30      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .45435      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 02:58:48   Additional Information  Earth MOID = 3.45453 au   Jupiter MOID = .564098 au   T_jup = 2.912  [ 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 10.1   n/a MPO358742   diameter diameter 51.136 km 0.521 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)   rotation period rot_per 32.44 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so. Published Reference List: [Stephens, R.D.; Coley, D.R.; French, L.M. (2015) Minor Planet Bull. 42, 216-224.] geometric albedo albedo 0.062   0.007 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)   11552 Boucolion           Discovered 1993 Jan. 27 by E. W. Elst at Caussols. Boucolion was the father of Pedasos and Aesopos. Both sons died near the Scamander river. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20030106/MPCPages.arc Last Updated: 2003-10-02 Alternate Designations  1993 BD4 = 1975 NP1 = 1994 CE20  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jan-25 13:19 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin