+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   5638 Deikoon (1988 TA3) Classification: Jupiter Trojan          SPK-ID: 2005638 [ 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 29 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1073995118834767 4.7649e-08   a 5.242554124278811 6.7476e-08 au q 4.67950637030856 2.7363e-07 au i 10.91413787206887 5.5037e-06 deg node 156.0260022484113 2.5007e-05 deg peri 92.5029292550846 3.6883e-05 deg M 325.3279946976605 2.7506e-05 deg tp 2459422.769069003645 (2021-Jul-27.26906900) 0.00033479 TDB period 4384.426672634794 12.00 8.4647e-05 2.318e-07 d yr n .0821087970855857 1.5852e-09 deg/d Q 5.805601878249064 7.4723e-08 au   Orbit Determination Parameters    # obs. used (total)      1969      data-arc span      11681 days (31.98 yr)      first obs. used      1988-08-18      last obs. used      2020-08-11      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .44957      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 03:41:56   Additional Information  Earth MOID = 3.68889 au   Jupiter MOID = .1823 au   T_jup = 2.952  [ 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 10.5   n/a MPO358685   diameter diameter 41.455 km 0.482 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)   rotation period rot_per 19.40 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: [Molnar, L.A.; Haegert, M.J.; Hoogenboom, K.M. (2008) Minor Planet Bull. 35, 82-84.] geometric albedo albedo 0.071   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)   5638 Deikoon (1988 TA3)          Discovered 1988-Oct-10 by Shoemaker, C. S. at Palomar Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1988 TA3 = 1988 RJ1 = 1989 TO2  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jan-22 10:15 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin