7543 Prylis

{{Short description|Trojan asteroid}} {{Use dmy dates|date=June 2018}} {{Infobox planet | minorplanet = yes | name = 7543 Prylis | background = #C2FFFF | image = | image_size = | caption = | discovery_ref = <ref name="MPC-object" /> | discoverer = C. J. van Houten<br />I. van Houten-G.<br />T. Gehrels | discovery_site = Palomar Obs. | discovered = 19 September 1973 | mpc_name = (7543) Prylis | alt_names = 1973 SY{{·}}1990 EP | adjective = Prylidian | pronounced = {{IPAc-en|ˈ|p|r|aɪ|l|ᵻ|s}} | named_after = Prylis {{small|(Greek mythology)}}<ref name="MPC-object" /> | mp_category = Jupiter trojan<ref name="MPC-object" /><ref name="jpldata" /><br />{{nowrap|Greek<ref name="MPC-Jupiter-Trojans" />{{·}}background<ref name="AstDys-object" />}} | orbit_ref = <ref name="jpldata" /> | epoch = 23 March 2018 (JD 2458200.5) | uncertainty = 0 | observation_arc = 61.40 yr (22,425 d) | aphelion = 5.5172 AU | perihelion = 4.8656 AU | semimajor = 5.1914 AU | eccentricity = 0.0628 | period = 11.83 yr (4,320 d) | mean_anomaly = 261.11° | mean_motion = {{Deg2DMS|0.0833|sup=ms}} / day | inclination = 14.066° | asc_node = 195.56° | arg_peri = 207.14° | jupiter_moid = 0.0352 AU | tisserand = 2.9360 | mean_diameter = {{val|42.893|0.578|ul=km}}<ref name="Grav-2012" /> | rotation = {{val|17.80|0.02|ul=h}}<ref name="Stephens-2016k" />{{efn|name=lightcurve-plots-CS3}} | albedo = {{val|0.055|0.004}}<ref name="Grav-2012" /> | spectral_type = C {{small|(assumed)}}<ref name="lcdb" /> | abs_magnitude = 10.6<ref name="MPC-object" /><ref name="jpldata" /><ref name="Grav-2012" /><ref name="lcdb" /> }}

'''7543 Prylis''' {{IPAc-en|ˈ|p|r|aɪ|l|ᵻ|s}} is a Jupiter trojan from the Greek camp, approximately {{convert|43|km|mi|abbr=off|sigfig=2|sp=us}} in diameter. It was discovered on 19 September 1973, by Dutch astronomer couple Ingrid and Cornelis van Houten at Leiden, on photographic plates taken by Dutch–American astronomer Tom Gehrels at the Palomar Observatory, California.<ref name="MPC-object" /> The dark Jovian asteroid is possibly spherical in shape and has a rotation period of 17.8 hours.<ref name="lcdb" /> It was named after Prylis, son of Hermes from Greek mythology.<ref name="MPC-object" />

== Orbit and classification ==

''Prylis'' is a dark Jovian asteroid orbiting in the leading Greek camp at Jupiter's {{L4}} Lagrangian point, 60° ahead of the Gas Giant's orbit in a 1:1 resonance {{crossreference|(see Trojans in astronomy)}}.<ref name="MPC-Jupiter-Trojans" /> It is also a non-family asteroid in the Jovian background population.<ref name="AstDys-object" /> It orbits the Sun at a distance of 4.9–5.5 AU once every 11 years and 10 months (4,320 days; semi-major axis of 5.19 AU). Its orbit has an eccentricity of 0.06 and an inclination of 14° with respect to the ecliptic.<ref name="jpldata" /> The body's observation arc begins with a precovery at Palomar in May 1956, more than 18 years prior to its official discovery observation.<ref name="MPC-object" />

=== Palomar–Leiden Trojan survey ===

While the discovery date aligns with the second Palomar–Leiden Trojan survey, ''Prylis'' has not received a {{nowrap|"T-2"}} prefixed survey designation, which was assigned to 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.<ref name="MPC-discoverers" />

== Naming ==

This minor planet was named after Prylis, one of many sons of the Olympian god Hermes. He suggested that entry to Troy could be gained by means of the Trojan Horse, which was eventually built by the carpenter Epeius ''(also see 2148 Epeios)''. The subterfuge of the wooden horse was later claimed by Odysseus. The official naming citation was published by the Minor Planet Center on 18 August 1997 ({{small|M.P.C. 30478}}).<ref name="MPC-Circulars-Archive" />

== Physical characteristics ==

''Prylis'' is an assumed C-type asteroid.<ref name="lcdb" />

=== Rotation period ===

In June 2016, a first rotational lightcurve of ''Prylis'' was obtained from photometric observations by Robert Stephens at the Center for Solar System Studies in Landers, California. Lightcurve analysis gave a rotation period of {{val|17.80|0.02|}} hours with a low brightness amplitude of 0.10 magnitude ({{small|U=2}}).<ref name="Grav-2012" /><ref name="lcdb" />{{efn|name=lightcurve-plots-CS3}}

=== Diameter and albedo ===

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, ''Prylis'' measures 42.89 kilometers in diameter and its surface has an albedo of 0.055.<ref name="Grav-2012" /> The ''Collaborative Asteroid Lightcurve Link'' assumes a standard albedo for a carbonaceous asteroid of 0.057 and a diameter of 42.23 kilometers based on an absolute magnitude of 10.6.<ref name="lcdb" />

== Notes == {{notelist|refs=

{{efn|name=lightcurve-plots-CS3|1=Lightcurve plot of (7543) Prylis from [http://www.planetarysciences.org/plots/RDS/7543_PRYLIS_20160613.PNG June 2016] by Robert Stephens at the Center for Solar System Studies {{Obscode|U81}}. Quality code is 2+ (lightcurve rating at CS3). Summary figures at the [http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=7543%7CPrylis LCDB] and [http://www.planetarysciences.org/PHP/CS3_Lightcurves.php CS3].}}

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== References == {{reflist|30em|refs=

<ref name="jpldata">{{cite web |type = 2017-09-30 last obs. |title = JPL Small-Body Database Browser: 7543 Prylis (1973 SY) |url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2007543 |publisher = Jet Propulsion Laboratory |access-date = 25 June 2018}}</ref>

<ref name="MPC-object">{{cite web |title = 7543 Prylis (1973 SY) |work = Minor Planet Center |url = https://www.minorplanetcenter.net/db_search/show_object?object_id=7543 |access-date = 25 June 2018}}</ref>

<ref name="MPC-Jupiter-Trojans">{{cite web |title = List of Jupiter Trojans |work = Minor Planet Center |first3 = V. |last3 = Carruba |date = 1 June 2018 |url = https://www.minorplanetcenter.net/iau/lists/JupiterTrojans.html |access-date = 25 June 2018}}</ref>

<ref name="MPC-discoverers">{{cite web |title = Minor Planet Discoverers |work = Minor Planet Center |url = https://www.minorplanetcenter.net/iau/lists/MPDiscsNum.html |date = 31 May 2018 |access-date = 25 June 2018}}</ref>

<ref name="MPC-Circulars-Archive">{{cite web |title = MPC/MPO/MPS Archive |work = Minor Planet Center |url = https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html |access-date = 25 June 2018}}</ref>

<ref name="Grav-2012">{{cite journal |first1 = T. |last1 = Grav |first2 = A. K. |last2 = Mainzer |first3 = J. M. |last3 = Bauer |first4 = J. R. |last4 = Masiero |first5 = C. R. |last5 = Nugent |date = November 2012 |title = WISE/NEOWISE Observations of the Jovian Trojan Population: Taxonomy |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012ApJ...759...49G |journal = The Astrophysical Journal |volume = 759 |issue = 1 |page = 10 |bibcode = 2012ApJ...759...49G |doi = 10.1088/0004-637X/759/1/49 |arxiv = 1209.1549 |s2cid = 119101711 |access-date= 25 June 2018}} ([http://vizier.cfa.harvard.edu/viz-bin/VizieR-6?-source=J/ApJ/759/49/table1&MPC=07543 online catalog])</ref>

<ref name="AstDys-object">{{cite web |title = Asteroid (7543) Prylis – Proper Elements |publisher = AstDyS-2, Asteroids – Dynamic Site |url = https://newton.spacedys.com/astdys/index.php?n=7543&pc=1.1.6 |access-date= 25 June 2018}}</ref>

<ref name="lcdb">{{cite LCDB|number = 7543 |access-date = 25 June 2018}}</ref>

<ref name="Stephens-2016k">{{Cite journal |first1 = Robert D. |last1 = Stephens |first2 = Daniel R. |last2 = Coley |first3 = Brian D. |last3 = Warner |first4 = Linda, M. |last4 = French |date = October 2016 |title = Lightcurves of Jovian Trojan Asteroids from the Center for Solar System Studies: L4 Greek Camp and Spies |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2016MPBu...43..323S |journal = The Minor Planet Bulletin |volume = 43 |issue = 4 |pages = 323–331 |issn = 1052-8091 |bibcode = 2016MPBu...43..323S |access-date= 25 June 2018}}</ref>

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== External links == * [http://www.minorplanet.info/PHP/lcdbsummaryquery.php Asteroid Lightcurve Database (LCDB)], query form ([http://www.minorplanet.info/lightcurvedatabase.html info] {{Webarchive|url=https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html |date=16 December 2017 }}) * [https://books.google.com/books?id=aeAg1X7afOoC&pg Dictionary of Minor Planet Names], Google books * [https://www.minorplanetcenter.net/iau/lists/NumberedMPs005001.html Discovery Circumstances: Numbered Minor Planets (5001)-(10000)] – Minor Planet Center * [https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=7543+Prylis Asteroid 7543 Prylis] at the Small Bodies Data Ferret * {{AstDys|7543}} * {{JPL small body}}

{{Minor planets navigator |7542 Johnpond |number=7543 |7544 Tipografiyanauka}} {{Small Solar System bodies}} {{Authority control}}

{{DEFAULTSORT:Prylis}} 007543 Category:Discoveries by Cornelis Johannes van Houten Category:Discoveries by Ingrid van Houten-Groeneveld Category:Discoveries by Tom Gehrels Category:Named minor planets 19730919