+ 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 2459000.5 (2020-May-31.0) TDB Reference: JPL 36 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .04979303617071162 6.1056e-08   a 5.17958726228805 1.0101e-07 au q 4.921679886387584 3.7604e-07 au i 25.15561929855306 5.4603e-06 deg node 144.2780442452463 1.0909e-05 deg peri 256.5284091047308 5.8058e-05 deg M 340.7396020945566 5.6587e-05 deg tp 2459230.858325240909 (2021-Jan-16.35832524) 0.00067538 TDB period 4305.674134763841 11.79 0.00012595 3.448e-07 d yr n .08361060050814677 2.4458e-09 deg/d Q 5.437494638188515 1.0604e-07 au   Orbit Determination Parameters    # obs. used (total)      1700      data-arc span      23517 days (64.39 yr)      first obs. used      1956-03-15      last obs. used      2020-08-03      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .4517      source      ORB      producer      Otto Matic      solution date      2020-Aug-24 23:26:13   Additional Information  Earth MOID = 4.0127 au   Jupiter MOID = .0703978 au   T_jup = 2.809  [ 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 10.1   n/a MPO384801   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. 2019-August); 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 ] 2020-Sep-20 11:06 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin