+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   13475 Orestes (1973 SX) Classification: Jupiter Trojan          SPK-ID: 2013475 [ 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 28 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .0738896267201565 4.1619e-08   a 5.177931929527663 8.3164e-08 au q 4.795336472072484 2.4613e-07 au i 7.941364310517883 6.0208e-06 deg node 353.420294278777 2.538e-05 deg peri 122.6197322573781 4.9537e-05 deg M 255.3026735871822 4.5575e-05 deg tp 2460452.101349696249 (2024-May-21.60134970) 0.00056229 TDB period 4303.610238470109 11.78 0.00010368 2.839e-07 d yr n .08365069791449711 2.0153e-09 deg/d Q 5.560527386982842 8.9309e-08 au   Orbit Determination Parameters    # obs. used (total)      1187      data-arc span      17283 days (47.32 yr)      first obs. used      1973-09-19      last obs. used      2021-01-13      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .52729      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 02:12:18   Additional Information  Earth MOID = 3.81962 au   Jupiter MOID = .410389 au   T_jup = 2.975  [ 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 11.61   n/a E2021B10   diameter diameter 22.073 km 1.895 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)   geometric albedo albedo 0.100   0.038 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)   13475 Orestes           Discovered 1973 Sept. 19 by C. J. van Houten and I. van Houten-Groeneveld on Palomar Schmidt plates taken by T. Gehrels. Orestes, a son of Agamemnon, was a child at the time of the murder of his father. Electra brought him to his uncle, where he lived together with his cousin Pylades. To avenge his father, Orestes killed Aegisthus and Clytaemnestra. The Erinyen persecuted him until he was absolved by the special jury at the Areopagus. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20000523/MPCPages.arc Last Updated: 2013-03-29 Alternate Designations  1973 SX = 1996 RO14  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-10 21:58 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin