+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   5285 Krethon (1989 EO11) Classification: Jupiter Trojan          SPK-ID: 2005285 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 41 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .05018132390034358 2.7725e-08   a 5.181622538051895 8.3126e-08 au q 4.921601859140593 1.9141e-07 au i 25.1547957167077 2.1875e-07 deg node 144.274362446558 2.0698e-06 deg peri 256.5864061670957 2.4839e-05 deg M 357.4161364576564 2.5198e-05 deg tp 2459231.421756784236 (2021-Jan-16.92175678) 0.00030124 TDB period 4308.212202347224 11.80 0.00010367 2.838e-07 d yr n .0835613435670283 2.0108e-09 deg/d Q 5.441643216963199 8.7297e-08 au   Orbit Determination Parameters    # obs. used (total)      2261      data-arc span      23733 days (64.98 yr)      first obs. used      1956-03-15      last obs. used      2021-03-07      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .41262      source      ORB      producer      Otto Matic      solution date      2021-Apr-12 17:21:31   Additional Information  Earth MOID = 4.01159 au   Jupiter MOID = .0724608 au   T_jup = 2.808  [ 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 10.18   n/a E2021B10   diameter diameter 49.606 km 0.749 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)   rotation period rot_per 12.04 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so. Published Reference List: [French, L.M.; Stephens, R.D.; Coley, D.R.; Wasserman, L.H.; et al. (2013) Minor Planet Bull. 40, 198-203.] [Stephens, R.D.; Coley, D.R.; French, L.M. (2016) Minor Planet Bull. 43, 15-22.] [Durech, J.; Hanus, J. (2018) Astron. Astrophys. 620, A91.] geometric albedo albedo 0.079   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)   5285 Krethon (1989 EO11)          Discovered 1989-Mar-09 by Shoemaker, C. S. at Palomar Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-14 07:35 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin