| 词条 | 3548 Eurybates |
| 释义 |
| minorplanet = yes | name = 3548 Eurybates | background = #C2FFFF | image = | image_size = | caption = | discovery_ref = [1] | discovered = 19 September 1973 | discoverer = C. J. van Houten I. van Houten-G. Tom Gehrels | discovery_site = Palomar Obs. | mpc_name = (3548) Eurybates | alt_names = 1973 SO{{·}}1954 CB 1957 JX{{·}}{{mp|1978 EE|5}} 1985 TZ | pronounced = {{IPAc-en|j|uː|r|ɪ|ˈ|b|eɪ|t|iː|z}} {{Respell|yoo|ri|BAY|teez}} | named_after = Eurybates [2] {{small|(Greek mythology)}} | mp_category = Jupiter trojan [1][5] {{nowrap|Greek [6][7]{{·}}Eurybates [7][9]}} | orbit_ref = | epoch = 23 March 2018 (JD 2458200.5) | uncertainty = 0 | observation_arc = 19.59 yr (7,154 d) | aphelion = 5.6525 AU | perihelion = 4.7317 AU | semimajor = 5.1921 AU | eccentricity = 0.0887 | period = 11.83 yr (4,321 d) | mean_anomaly = 237.34° | mean_motion = {{Deg2DMS|0.0833|sup=ms}} / day | inclination = 8.0591° | asc_node = 43.538° | arg_peri = 27.799° | jupiter_moid = 0.0945 AU | tisserand = 2.9720 | mean_diameter = {{val|63.89|0.30|u=km}}[11][12] {{val|68.40|3.92|u=km}}[13] {{val|72.08|u=km}} {{small|(derived)}}[5] {{val|72.14|4.1|u=km}}[15] | rotation = {{val|8.711|0.009|ul=h}}[16] {{val|8.73|0.01|u=h}}[17] | albedo = {{val|0.0491}} {{small|(derived)}}[5] {{val|0.052|0.007}}[11][12] {{val|0.0538|0.007}}[15] {{val|0.060|0.007}}[13] | spectral_type = C {{small|(assumed)}}[5][12] CP [25] B–V {{=}} {{val|0.677|0.052}}[26] V–R {{=}} {{val|0.352|0.045}}[26] V–I {{=}} {{val|0.691|0.050}}[26] | abs_magnitude = 9.50[13][15] {{val|9.55|0.30}}[31] 9.6[1][5] 9.8[11] }}3548 Eurybates ({{IPAc-en|j|uː|r|ɪ|ˈ|b|eɪ|t|iː|z}} {{Respell|yoo|ri|BAY|teez}}), provisional designation {{mp|1973 SO}}, is a carbonaceous Jupiter trojan from the Greek camp and the parent body of the Eurybates family, approximately {{convert|68|km|mi|abbr=off|sigfig=2|sp=us}} in diameter. It is a target to be visited by the Lucy mission in August 2027.[12] Discovered during the second Palomar–Leiden Trojan survey in 1973, it was later named after Eurybates from Greek mythology.[1] The C/P-type asteroid belongs to the 60 largest Jupiter trojans and has a rotation period of 8.7 hours.[5] DiscoveryEurybates was discovered on 19 September 1973, by Dutch astronomers Ingrid and Cornelis van Houten at Leiden, on photographic plates taken by Tom Gehrels at the Palomar Observatory in California, United States. In 1951, it was first observed as {{mp|1954 CB}} at the Goethe Link Observatory, extending the asteroid's observation arc by 22 years prior to its official discovery observation at Palomar.[1] Since the discovery of 588 Achilles by Max Wolf in 1906, more than 7000 Jupiter trojans, with nearly 4600 bodies in the Greek camp, have already been discovered.[6]Palomar–Leiden Trojan surveyWhile the discovery date aligns with the second Palomar–Leiden Trojan survey, Eurybates has not received a {{nowrap|"T-2"}} prefixed survey designation, which was assigned for the discoveries made by the fruitful collaboration between the Palomar and Leiden observatories in the 1960s and 1970s. Gehrels used Palomar's Samuel Oschin telescope (also known as the 48-inch Schmidt Telescope), and shipped the photographic plates to Ingrid and Cornelis van Houten at Leiden Observatory where astrometry was carried out. The trio are credited with the discovery of several thousand asteroids.[41] Orbit and classificationEurybates is a dark Jovian asteroid orbiting in the leading Greek camp at Jupiter's {{L4}} Lagrangian point, 60° ahead of Jupiter's orbit in a 1:1 resonance (see Trojans in astronomy).[6][7] It orbits the Sun at a distance of 4.7–5.7 AU once every 11 years and 10 months (4,321 days; semi-major axis of 5.19 AU). Its orbit has an eccentricity of 0.09 and an inclination of 8° with respect to the ecliptic.Eurybates familyEurybates is the parent body of the small Eurybates family ({{small|005}}),[7][9] with 218 known members of carbonaceous and/or primitive composition.[25]{{rp|23}} Only a few families have been identified among the Jovian asteroids; four of them in the Greek camp. This potentially collisional family was first characterized by Jakub Rozehnal and Miroslav Brož in 2011, and further described in 2014.[48][49] Members of this family include the Jupiter trojans {{mpl|(5258) 1989 AU|1}}, 8060 Anius, 9818 Eurymachos, {{mpl|(163189) 2002 EU|6}}, {{mpl|(287577) 2003 FE|42}} and 360072 Alcimedon.[25]Physical characteristicsEurybates has been characterized as a carbonaceous C-type asteroid by both the Lucy mission team and Brian Warner's Lightcurve Data Base.[5][12] The overall spectral type for members of the Eurybates family is that of a C- and P-type.[25]{{rp|23}} Rotational lightcurvesIn May 1992, a rotational lightcurve of Eurybates was obtained from photometric observations by Stefano Mottola and Maria Gonano–Beurer using the now decommissioned ESO 1-metre telescope at La Silla Observatory in northern Chile. Lightcurve analysis gave a rotation period of 8.711 hours with a brightness variation of 0.20 magnitude ({{small|U=3-}}).[5][16] In October 2010, photometric observations by American astronomer Robert Stephens at the Goat Mountain Astronomical Research Station {{Obscode|G79}} in California gave a concurring period of 8.73 hours and an amplitude of 0.19 magnitude ({{small|U=2+}}).[5][17] Eurybates has two determined spin axes at (143.0°, −45.0°) and/or (325.0°, –61.0°) in ecliptic coordinates (λ, β).[12]Diameter and albedoAccording to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Eurybates measures between 63.89 and 72.14 kilometers in diameter and its surface has an albedo between 0.052 and 0.060.[11][13][15] The Collaborative Asteroid Lightcurve Link agrees with IRAS, and derives an albedo of 0.0491 and a diameter of 72.08 kilometers with an absolute magnitude of 9.6.[5] {{Largest Jupiter trojans}}NamingThis minor planet was named after Eurybates, the Ancient hero from Greek mythology, who was a herald for the Greek armies during the Trojan War.[2] The official naming citation was published by the Minor Planet Center on 28 April 1991 ({{small|M.P.C. 18138}}).[64] Lucy mission targetEurybates is planned to be visited by the Lucy spacecraft which will launch in 2021. The fly by is scheduled for 12 August 2027, and will approach the asteroid to a distance of 1000 kilometers at a velocity of 5.8 kilometers per second and a solar phase angle of 81°.[12] The mission's six targets in chronological order with their flyby dates are:[12][67][1]
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9 : Jupiter trojans (Greek camp)|Eurybates asteroids|Discoveries by Cornelis Johannes van Houten|Discoveries by Ingrid van Houten-Groeneveld|Discoveries by Tom Gehrels|Minor planets named from Greek mythology|Named minor planets|Minor planets to be visited by spacecraft|Astronomical objects discovered in 1973 |
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