+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   14791 Atreus (1973 SU) Classification: Jupiter Trojan          SPK-ID: 2014791 [ 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 23 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1616364419813745 5.5227e-08   a 5.144578578384847 7.7385e-08 au q 4.313027201481122 3.1403e-07 au i 2.936839569183428 6.015e-06 deg node 194.7755813441455 7.0299e-05 deg peri 185.8278340559063 7.1629e-05 deg M 358.5899740418994 1.1567e-05 deg tp 2459217.193513073759 (2021-Jan-02.69351307) 0.00013686 TDB period 4262.095085574665 11.67 9.6166e-05 2.633e-07 d yr n .08446550177128689 1.9058e-09 deg/d Q 5.976129955288571 8.9893e-08 au   Orbit Determination Parameters    # obs. used (total)      1353      data-arc span      17313 days (47.40 yr)      first obs. used      1973-09-19      last obs. used      2021-02-12      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .49652      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 00:39:22   Additional Information  Earth MOID = 3.31452 au   Jupiter MOID = .246617 au   T_jup = 2.971  [ 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 11.88   n/a E2020-QM5   diameter diameter 22.330 km 0.362 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2011ApJ...742...40G)   rotation period rot_per 19.615 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: [Ryan, E.L.; Sharkey, B.N.L.; Woodward, C.E. (2017) Astron. J. 153, A116.] [Szabo, Gy.M.; Pal, A.; Kiss, Cs.; Kiss, L.L.; et al. (2017) Astron. Astrophys. 599, A44.] geometric albedo albedo 0.098   0.015 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2011ApJ...742...40G)   14791 Atreus           Discovered 1973 Sept. 19 by C. J. van Houten and I. van Houten-Groeneveld on Palomar Schmidt plates taken by T. Gehrels. Atreus was the son of Pelops, father of Agamemnon and Menelaos and brother of Thyestes. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20010309/MPCPages.arc Last Updated: 2009-05-11 Alternate Designations  1973 SU = 1999 XJ31  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-18 19:06 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin