+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   588 Achilles (A906 DN) Classification: Jupiter Trojan          SPK-ID: 2000588 [ 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 80 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1471215408945946 4.0871e-08   a 5.209393782387003 6.1368e-08 au q 4.442979741995507 2.4218e-07 au i 10.31973109440609 5.0646e-06 deg node 316.5360168458093 2.205e-05 deg peri 133.3085424101011 2.8662e-05 deg M 271.7364412652858 2.0013e-05 deg tp 2460065.275724164068 (2023-Apr-30.77572416) 0.00025246 TDB period 4342.893785318271 11.89 7.6741e-05 2.101e-07 d yr n .08289403743122335 1.4648e-09 deg/d Q 5.975807822778498 7.0397e-08 au   Orbit Determination Parameters    # obs. used (total)      2285      data-arc span      41904 days (114.73 yr)      first obs. used      1906-02-22      last obs. used      2020-11-14      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .45641      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 01:54:42   Additional Information  Earth MOID = 3.47006 au   Jupiter MOID = .572335 au   T_jup = 2.946  [ 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 8.3   n/a MPO502158 IRAS observations used: 15 diameter diameter 130.099 km 0.554 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)   rotation period rot_per 7.306 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 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) Lunar & Planetary Sci. XL, #1391.] [Stephens, R.D. (2010) Minor Planet Bull. 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.] geometric albedo albedo 0.043   0.006 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)   B-V BV 0.755   0.033 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=2.65, mean=3.34, max.=3.58) deg. U-B UB 0.216   0.030 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #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 (A906 DN)          Discovered 1906-Feb-22 by Wolf, M. at Heidelberg Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jan-28 11:57 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin