+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   617 Patroclus (A906 UL) Classification: Jupiter Trojan          SPK-ID: 2000617 [ 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 59 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1389665604832871 9.327e-09   a 5.214559560207737 5.9051e-08 au q 4.489910153690426 9.1048e-08 au i 22.0517763307761 2.4129e-07 deg node 44.34841429339916 1.7421e-06 deg peri 307.8660818490041 5.4786e-06 deg M 237.0071671908755 6.6602e-06 deg tp 2460486.443097644020 (2024-Jun-24.94309764) 0.00010283 TDB period 4349.355185452411 11.91 7.388e-05 2.023e-07 d yr n .0827708900859872 1.406e-09 deg/d Q 5.939208966725047 6.7257e-08 au   Orbit Determination Parameters    # obs. used (total)      3955      data-arc span      7787 days (21.32 yr)      first obs. used      1998-04-22      last obs. used      2019-08-17      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .38855      source      ORB      producer      Ryan S. Park      solution date      2019-Oct-06 05:54:48   Additional Information  Earth MOID = 3.53757 au   Jupiter MOID = .189896 au   T_jup = 2.836  [ hide covariance matrix ] Orbital Elements at Epoch 2458700.5 (2019-Aug-05.0) TDB Reference: JPL 59 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1385502505848889 9.3254e-09   q 4.492906365609057 9.1173e-08 au tp 2460488.105076419718 (2024-Jun-26.60507642) 0.00010307 TDB node 44.35071270314538 1.7421e-06 deg peri 307.9185919333477 5.4871e-06 deg i 22.04899474618036 2.4137e-07 deg   Orbit Determination Parameters    # obs. used (total)      3955      data-arc span      7787 days (21.32 yr)      first obs. used      1998-04-22      last obs. used      2019-08-17      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .38855      source      ORB      producer      Ryan S. Park      solution date      2019-Oct-06 05:54:48   Additional Information  Jupiter MOID = .189896 au   T_jup = 2.836  Orbit Covariance (6×6)   e q tp node peri i e 8.696330863424608E-17 -7.743555083395616E-16 -3.953215631021455E-13 -1.622759358606547E-15 -1.129313167718788E-14 -1.330504420922597E-16 q -7.743555083395616E-16 8.312539119754302E-15 6.862174864736629E-12 4.167777037968591E-16 2.535327605289734E-13 5.098001576631596E-16 tp -3.953215631021455E-13 6.862174864736629E-12 1.06226913290381E-8 -5.903498533328476E-11 5.131621600688714E-10 -2.496860976562473E-12 node -1.622759358606547E-15 4.167777037968591E-16 -5.903498533328476E-11 3.035086358593029E-12 -6.347712003624767E-12 2.562046933092217E-13 peri -1.129313167718788E-14 2.535327605289734E-13 5.131621600688714E-10 -6.347712003624767E-12 3.010799469820217E-11 -3.949335161470986E-13 i -1.330504420922597E-16 5.098001576631596E-16 -2.496860976562473E-12 2.562046933092217E-13 -3.949335161470986E-13 5.826157220753815E-14 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 8.2   n/a MPO492756 IRAS observations used: 8 diameter diameter 140.362 km 0.868 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)   rotation period rot_per 102.8 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Marchis, F.; Hestroffer, D.; Descamps, P.; Berthier, J.; et al. (2006) Nature 439, 565-567.] [Mueller, M.; Marchis, F.; Emery, J.P.; Harris, A.W. (DLR); et al. (2010) Icarus 205, 505-515.] [Oey, J. (2012) Minor Planet Bull. 39, 106-107.] [Stephens, R.D.; Warner, B.D. (2018) Minor Planet Bull. 45, 343-347.] geometric albedo albedo 0.047   0.003 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)   B-V BV 0.677   0.013 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=5; phase (min.=2.24, mean=6.14, max.=8.61) deg. U-B UB 0.215   0.045 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=7; phase (min.=2.24, mean=6.52, max.=8.61) deg. Tholen spectral type spec_T P   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo 617 Patroclus (A906 UL)          Discovered 1906-Oct-17 by Kopff, A. at Heidelberg Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  A906 UL = 1941 XC = 1962 NB  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jan-18 08:22 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin