+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 31 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1072210874695144 4.7489e-08   a 5.240875472372299 6.7033e-08 au q 4.678943104932237 2.7229e-07 au i 10.91462412897679 5.4782e-06 deg node 156.0299594024158 2.5008e-05 deg peri 92.65216449009711 3.6819e-05 deg M 341.6173244650855 2.7341e-05 deg tp 2459424.274403816225 (2021-Jul-28.77440382) 0.00033269 TDB period 4382.321018550008 12.00 8.4078e-05 2.302e-07 d yr n .08214824940394583 1.5761e-09 deg/d Q 5.802807839812363 7.422e-08 au   Orbit Determination Parameters    # obs. used (total)      1989      data-arc span      11841 days (32.42 yr)      first obs. used      1988-08-18      last obs. used      2021-01-18      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .44856      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 19:07:24   Additional Information  Earth MOID = 3.68679 au   Jupiter MOID = .180607 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 10.54   n/a E2021B10   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-Mar-03 03:18 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin