+ 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 2459396.5 (2021-Jul-01.0) TDB Reference: JPL 40 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .153039947701912 2.5277e-08   a 5.272213789506323 8.0437e-08 au q 4.465354466886977 1.8369e-07 au i 14.67888579176664 1.9473e-06 deg node 138.3619207974306 3.579e-06 deg peri 182.2057156822205 1.0333e-05 deg M 318.0256872644582 1.3017e-05 deg tp 2459912.047920098263 (2022-Nov-28.54792010) 0.00016498 TDB period 4421.686482509568 12.11 0.00010119 2.77e-07 d yr n .08141689860283327 1.8632e-09 deg/d Q 6.07907311212567 9.2747e-08 au   Orbit Determination Parameters    # obs. used (total)      2445      data-arc span      10377 days (28.41 yr)      first obs. used      1993-01-27      last obs. used      2021-06-26      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .44287      source      ORB      producer      Otto Matic      solution date      2021-Jul-08 02:43:59   Additional Information  Earth MOID = 3.45192 au   Jupiter MOID = .565183 au   T_jup = 2.911  [ 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 10.20   n/a E2021B10   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-Jul-25 11:34 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin