+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   1461 Jean-Jacques (1937 YL) Classification: Main-belt Asteroid          SPK-ID: 2001461 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: MPO244186 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.0448257 n/a   a 3.1255722 n/a AU q 2.9854662 n/a AU i 15.32998 n/a deg node 104.81283 n/a deg peri 335.33800 n/a deg M 258.27248 n/a deg tp 2456970.8332576 (2014-Nov-09.33325760) n/a JED period 2018.3326274 5.53 n/a n/a d yr n 0.17836505 n/a deg/d Q 3.2656782 n/a AU   Orbit Determination Parameters    # obs. used (total)      904      first obs. used      1935-??-??      last obs. used      2012-11-11      # oppositions      36      planetary ephem.      DE403      condition code      0      fit RMS      0.57      data source      MPC:mpn      producer      MPCLINUX   Additional Information  T_jup = 3.158  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 10.01 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 8 diameter diameter 32.94 km 1.4 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 8 rotation period rot_per 16.56 h n/a Asteroid Lightcurve DataBase (Rev. 2013-May-01) Result based on less than full coverage, so that the period may be wrong by 30 percent or so. Published Reference List: [Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] geometric albedo albedo 0.1613   0.014 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 8 B-V BV .715 mag .018 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=3; phase (min.=5.09, mean=9.76, max.=19.07) deg. U-B UB .210 mag .035 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=3; phase (min.=5.09, mean=9.76, max.=19.07) deg. Tholen spectral type spec_T M   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo 1461 Jean-Jacques (1937 YL)          Discovered 1937-Dec-30 by Laugier, M. at Nice Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1937 YL = 1935 OH = 1939 GH  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-18 10:00 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin