+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   30704 Phegeus (3250 T-3) Classification: Jupiter Trojan          SPK-ID: 2030704 [ 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 25 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .03844281960666303 5.3423e-08   a 5.243109414745661 1.0385e-07 au q 5.041549505336597 3.4489e-07 au i 14.89317193240519 5.3809e-06 deg node 20.50044954111034 1.7481e-05 deg peri 283.1969904462904 8.5362e-05 deg M 305.6478742001952 8.6605e-05 deg tp 2459662.557701613681 (2022-Mar-24.05770161) 0.0010564 TDB period 4385.123287703701 12.01 0.00013028 3.567e-07 d yr n .08209575338724771 2.439e-09 deg/d Q 5.444669324154725 1.0784e-07 au   Orbit Determination Parameters    # obs. used (total)      1305      data-arc span      15660 days (42.87 yr)      first obs. used      1977-10-07      last obs. used      2020-08-22      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .5384      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 01:04:54   Additional Information  Earth MOID = 4.06601 au   Jupiter MOID = .162067 au   T_jup = 2.931  [ 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 11.3   n/a MPO474159   diameter diameter 27.002 km 0.362 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)   geometric albedo albedo 0.088   0.016 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)   30704 Phegeus           Discovered 1977 Oct. 16 by C. J. van Houten and I. van Houten-Groeneveld on Palomar Schmidt plates taken by T. Gehrels. Phegeus was the oldest son of Dares, a priest of the god Hephaistos. Phegeus was fatally wounded with the spear of Diomedes. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20030318/MPCPages.arc Last Updated: 2003-10-02 Alternate Designations  3250 T-3 = 1999 RG246 = 2000 RN38  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Feb-25 16:48 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin