+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   588 Achilles (1906 TG) Classification: Jupiter Trojan          SPK-ID: 2000588 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: JPL 38 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1482006612348372 7.1562e-08   a 5.198596650526183 7.8735e-08 AU q 4.428161189424993 3.8699e-07 AU i 10.31750172167913 9.0346e-06 deg node 316.5949090660665 3.9576e-05 deg peri 133.0663879578904 4.8555e-05 deg M 55.92074294817539 2.6198e-05 deg tp 2455727.991089812257 (2011-Jun-15.49108981) 0.00031462 JED period 4329.398983342497 11.85 9.8355e-05 2.693e-07 d yr n .0831524193970368 1.8891e-09 deg/d Q 5.969032111627373 9.0403e-08 AU   Orbit Determination Parameters    # obs. used (total)      985      data-arc span      39126 days (107.12 yr)      first obs. used      1906-02-22      last obs. used      2013-04-07      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .63286      data source      ORB      producer      Otto Matic      solution date      2013-Apr-29 12:36:55   Additional Information  Earth MOID = 3.45466 AU   T_jup = 2.946  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 8.67 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 15 diameter diameter 135.47 km 4.1 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 15 rotation period rot_per 7.306 h n/a Asteroid Lightcurve DataBase (Rev. 2013-May-01) Published Reference List: [Angeli, C.A.; Lazzaro, D.; Florczak, A.; Betzler, A.S.; Carvano, J.M. (1999) Planet. Space Sci. 47, 699-714.] [Shevchenko, V.G.; Krugly, Yu.N.; Belskaya, N.; Chirony, V.G.; et al. (2009) 40th LPSC, #1391.] [Stephens, R.D. (2010) Minor Planet Bul. 37, 47-48.] [Mottola, S.; Di Martino, M.; Erikson, A.; Gonano-Beurer, M.; et al. (2011) Astron. J. 141, A170.] [Shevchenko, V.G.; Belskya, I.N.; Slyusarev, L.G.; Krugly, Yu.N.; et al. (2012) Icarus 217, 202-208.] [Shevchenko, V.G.; Belskya, I.N.; Slyusarev, L.G.; Krugly, Yu.N.; et al. (2012) Icarus 217, 202-208.] [Shevchenko, V.G.; Belskya, I.N.; Slyusarev, L.G.; Krugly, Yu.N.; et al. (2012) Icarus 217, 202-208.] geometric albedo albedo 0.0328   0.002 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 15 B-V BV .755 mag .033 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=4; phase (min.=2.65, mean=3.34, max.=3.58) deg. U-B UB .216 mag .030 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=4; phase (min.=2.65, mean=3.34, max.=3.58) deg. Tholen spectral type spec_T DU   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices 588 Achilles (1906 TG)          Discovered 1906-Feb-22 by Wolf, M. at Heidelberg (024) Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-18 21:18 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin