+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   4709 Ennomos (1988 TU2) Classification: Jupiter Trojan          SPK-ID: 2004709 [ 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 26 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .02366914633257393 1.1187e-07   a 5.23010329657124 1.8928e-07 AU q 5.106311216310218 6.8365e-07 AU i 25.47660421197069 9.373e-06 deg node 253.168425633288 2.7787e-05 deg peri 85.34376911657101 0.00023765 deg M 57.09849962519318 0.0002293 deg tp 2455707.575332322377 (2011-May-26.07533232) 0.0027974 JED period 4368.816729010512 11.96 0.00023716 6.493e-07 d yr n .0824021748519389 4.4732e-09 deg/d Q 5.353895376832263 1.9376e-07 AU   Orbit Determination Parameters    # obs. used (total)      769      data-arc span      22485 days (61.56 yr)      first obs. used      1951-08-05      last obs. used      2013-02-25      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .59256      data source      ORB      producer      Otto Matic      solution date      2013-Mar-29 14:56:53   Additional Information  Earth MOID = 4.17088 AU   T_jup = 2.805  [ 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 8.90 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 3 diameter diameter 80.85 km 4.3 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 3 rotation period rot_per 12.275 h n/a Asteroid Lightcurve DataBase (Rev. 2013-May-01) Published Reference List: [Mottola, S.; Di Martino, M.; Erikson, A.; Gonano-Beurer, M.; et al. (2011) Astron. J. 141, A170.] [Shevchenko, V.G.; Slyusarev, I.G.; Belskaya, I.N. (2012) ACM 2012, #6105.] [Shevchenko, V.G.; Slyusarev, I.G.; Belskaya, I.N. (2012) ACM 2012, #6105.] geometric albedo albedo 0.0744   0.009 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 3 4709 Ennomos (1988 TU2)          Discovered 1988-Oct-12 by Shoemaker, C. at Palomar (675) Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1988 TU2 = 1954 UM1 = 1977 UT2  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-20 01:59 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin