15810 Arawn

Kuiper belt object observed by New Horizons June 2017 yes 15810 Arawn #C2E0FF 1994 JR1 close-up from New Horizons.gif A distant view of Arawn (center) from New Horizons in November 2015.This four-frame animation depicting Arawn was taken on 2 November 2015, by New Horizons, when the spacecraft was 270 e6km e6mi unit away. Arawn is the white dot, just left of center, moving from right to left. M. J. IrwinA. Żytkow La Palma Obs. 12 May 1994 (15810) Arawn 1994 JR 1 ˈ ɑ: r aʊ n, with the PASTA vowelhttps://books.google.com/books?id=A4cIEAAAQBAJ The four branches of the Mabinogi 2017 Broadview Press 978-1-55481-319-3 Boyd Matthieu A Broadview anthology of British literature edition Peterborough, Ontario, Canada 990574218 Arawn (Welsh mythology) TNOplutino 16 February 2017 (JD 2457800.5) 2 21.91 yr (8,002 days) 44.241 AU 34.720 AU 39.480 AU 0.1206 248.07 yr (90,609 days) 30.638° 0.0040 ms / day 3.8074° 144.69° 101.89° 0 133 km mi on 145 km mi onhttp://photojournal.jpl.nasa.gov/catalog/PIA20589 Catalog Page for PIA20589 5 November 2016 5 November 2016 https://web.archive.org/web/20161105224539/http://photojournal.jpl.nasa.gov/catalog/PIA20589 live 5.47 0.33 h 0.04 7.6 15810 Arawn (provisional designation 1994 JR 1) is a trans-Neptunian object (TNO) from the inner regions of the Kuiper belt, approximately 133 km mi in diameter. It belongs to the plutinos, the most populous class of resonant TNOs. It was named after mythological figure Arawn, and was discovered on 12 May 1994, by astronomers Michael Irwin and Anna Żytkow with the 2.5-metre Isaac Newton Telescope at Roque de los Muchachos Observatory in the Canary Islands, Spain. Arawn is unusual in that it has been observed at a much closer distance than most Kuiper belt objects, by the New Horizons spacecraft, which imaged it from a distance of 111 e6km e6mi+AU unit in April 2016; this and its other observations have allowed its rotation period to be determined. Orbit and physical properties Arawn is moving in a relatively eccentric orbit entirely beyond the orbit of Neptune. With a semi-major axis of 39.4 AU, it orbits the Sun once every 247 years and 6 months (90,409 days). Its orbit has a perihelion (closest approach to the Sun) of 34.7 AU, an aphelion (farthest distance from the Sun) of 44.1 AU, an eccentricity of 0.12, and an inclination of 4° with respect to the ecliptic. It is a plutino, being trapped in a 2:3 mean motion resonance with Neptune, similarly to dwarf planet Pluto, the largest known plutino. It measures approximately 133 km mi on in diameter, based on an absolute magnitude of 7.6, and an estimated albedo of 0.1.August 2016 Observations by the Hubble Space Telescope show that Arawn has a very red surface.http://www.sci-news.com/space/color-kuiper-belt-objects-04290.html Scientists Determine Color of Kuiper Belt Objects JR1 and MU69 Planetary Science, Space Exploration Sci-News.com en-US 2 November 2016 4 November 2016 https://web.archive.org/web/20161104000028/http://www.sci-news.com/space/color-kuiper-belt-objects-04290.html live In April 2016, its rotation period of 5.47 hours was determined. Quasi-satellite dynamical state and orbital evolution In 2012 Arawn was hypothesized to be in a quasi-satellite loop around Pluto, as part of a recurring pattern, becoming a Plutonian quasi-satellite every 2 Myr and remaining in that phase for nearly 350,000 years.http://www.skyandtelescope.com/astronomy-news/plutos-fake-moon/ Pluto's fake moon Sky & Telescope 24 September 2012 24 September 2012 https://web.archive.org/web/20150701165908/http://www.skyandtelescope.com/astronomy-news/plutos-fake-moon/ 1 July 2015 live Measurements made by the New Horizons probe in 2015 increased the accuracy of calculations of the motion of Arawn. These calculations confirm the general dynamics described in the hypotheses. However, whether this motion means that Arawn should be classified as a quasi-satellite of Pluto remains debated, because Arawn's orbit is primarily controlled by Neptune with only occasional smaller perturbations caused by Pluto. Origin Arawn is moving in a very stable orbit, likely as stable as Pluto's. This suggests that it might be a primordial plutino formed around the same time Pluto itself and Charon came into existence. It is unlikely to be relatively recent debris that originated in collisions within Pluto's system or a captured object. Observation Arawn is currently relatively close to Pluto. In 2017 it was only 2.7 AU from Pluto. Before 486958 Arrokoth was discovered in 2014, Arawn was the best known target for a flyby by the New Horizons spacecraft after its Pluto flyby in 2015. Arawn was one of the first objects targeted for distant observations by New Horizons, which were taken on 2 November 2015.A Distant Close-up: New Horizons' Camera Captures a Wandering Kuiper Belt Object http://pluto.jhuapl.edu/News-Center/News-Article.php?page=20151204b New Horizons NASA/JHUAPL 5 December 2015 4 December 2015 8 December 2015 https://web.archive.org/web/20151208015343/http://pluto.jhuapl.edu/News-Center/News-Article.php?page=20151204b live More observations were made in April 2016. On 2 November 2015, Arawn was imaged by the LORRI instrument aboard New Horizons, and was therefore 1/15 the distance of the previous nearest observation of a Kuiper belt object other than the Pluto–Charon system.http://www.spacedaily.com/reports/New_Horizons_catches_a_wandering_Kuiper_Belt_Object_not_far_off_999.html New Horizons' catches a wandering Kuiper Belt Object not far off 7 December 2015 SpaceDaily 8 December 2015 26 November 2021 https://web.archive.org/web/20211126230455/http://www.spacedaily.com/reports/New_Horizons_catches_a_wandering_Kuiper_Belt_Object_not_far_off_999.html live Between 7–8 April 2016, New Horizons imaged Arawn from a new record distance of about 111 million kilometres, using the LORRI instrument. The new images allowed the science team at Southwest Research Institute (SwRI) in Boulder, Colorado, to further pinpoint the location of Arawn to within 1000 kilometers. The new data also enabled calculation that its rotation period is about 5.47 hours. On 15 April 2024, the James Webb Space Telescope (JWST) conducted an observation of the Kuiper Belt object Arawn for a duration of 1 minute and 4 seconds using its NIRCam instrument in Moving Target mode with published findings expected at a later date.https://jwstfeed.com/Schedule/ShowSchedule?pageNumber=1 JWST Schedule James Webb Space Telescope 17 April 2024 Arawn occulted a star on 25 August 2022.Buie Marc W. 7 October 2021 RECON: TNO occultation with 15810 https://www.boulder.swri.edu/~buie/recon/events/15810_220825_1230206.html live https://web.archive.org/web/20221103112145/https://www.boulder.swri.edu/~buie/recon/events/15810_220825_1230206.html 3 November 2022 Southwest Research Institute See also Kuiper belt List of trans-Neptunian objects References (15810) Arawn = 1994 JR1 IAU Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=15810 17 January 2017 27 October 2017 https://web.archive.org/web/20171027125555/http://www.minorplanetcenter.net/db_search/show_object?object_id=15810 live 2016-04-08 last obs. JPL Small-Body Database Browser: 15810 (1994 JR1) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2015810 Jet Propulsion Laboratory 26 August 2016 10 March 2020 https://web.archive.org/web/20200310235129/https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2015810 live Buie Marc W. 14 October 2006 Orbit Fit and Astrometric record for 15810 http://www.boulder.swri.edu/~buie/kbo/astrom/15810.html live https://web.archive.org/web/20120214062824/http://www.boulder.swri.edu/~buie/kbo/astrom/15810.html 14 February 2012 2 October 2008 Southwest Research Institute 17 July 2008 MPEC 2008-O05 : Distant Minor Planets (2008 Aug. 2.0 TT) Brian G. Marsden IAU Minor Planet Center https://www.minorplanetcenter.net/iau/mpec/K08/K08O05.html 26 August 2016 3 May 2020 https://web.archive.org/web/20200503014737/https://minorplanetcenter.net//iau/mpec/K08/K08O05.html live List of Known Trans-Neptunian Objects Johnston's Archive http://www.johnstonsarchive.net/astro/tnoslist.html 26 August 2016 13 March 2002 https://web.archive.org/web/20020313235137/http://www.johnstonsarchive.net/astro/tnoslist.html live New Horizons Collects First Science on a Post-Pluto Object New Horizons NASA/JHUAPL/SwRI 17 May 2016 http://www.nasa.gov/feature/new-horizons-collects-first-science-on-a-post-pluto-object 26 August 2016 7 June 2016 https://web.archive.org/web/20160607150433/http://www.nasa.gov/feature/new-horizons-collects-first-science-on-a-post-pluto-object/ dead The First High-phase Observations of a KBO: New Horizons Imaging of (15810) 1994 JR1 from the Kuiper Belt Simon B. Porter etal The Astrophysical Journal Letters 828 2 L15 2016 1605.05376 2016ApJ...828L..15P 10.3847/2041-8205/828/2/L15 54507506 free The analemma criterion: accidental quasi-satellites are indeed true quasi-satellites Carlos de la Fuente Marcos de la Fuente Marcos Raúl Monthly Notices of the Royal Astronomical Society 2016 462 3 3344–3349 1607.06686 10.1093/mnras/stw1833 free 2016MNRAS.462.3344D Plutino 15810 (1994 JR1), an accidental quasi-satellite of Pluto 10.1111/j.1745-3933.2012.01350.x de la Fuente Marcos C. de la Fuente Marcos R. November 2012 Monthly Notices of the Royal Astronomical Society: Letters 427 1 L85–L89 free 1209.3116 2012MNRAS.427L..85D 118570875 http://home.surewest.net/kheider/astro/50000.txt 50000 Quaoar distance (AU) from Pluto 18 December 2007 dead https://web.archive.org/web/20120225014807/https://home.surewest.net/kheider/astro/50000.txt 25 February 2012 Stryk Ted Lakdawalla Emily 24 January 2011 Report from the 2011 New Horizons Science Team Meeting https://www.planetary.org/blog/article/00002890/ live https://web.archive.org/web/20110701194949/http://planetary.org/blog/article/00002890/ 1 July 2011 25 January 2011 The Planetary Society Blog https://twitter.com/Alex_Parker/statuses/247508133814075393 25 closer candidates 30 September 2012 16 April 2014 https://web.archive.org/web/20140416124726/https://twitter.com/Alex_Parker/statuses/247508133814075393 live Notes "n" External links Asteroid Lightcurve Database (LCDB), query form (info https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html 16 December 2017 ) Dictionary of Minor Planet Names, Google books Asteroids and comets rotation curves, CdR https://web.archive.org/web/20241208174218/http://obswww.unige.ch/~behrend/page_cou.html 8 December 2024 – Observatoire de Genève, Raoul Behrend Discovery Circumstances: Numbered Minor Planets (15001)-(20000) – Minor Planet Center (15809) 1994 JS 15810 15811 Nüsslein-Volhard Astronomy Stars Spaceflight Outer space Solar System 015810 Category:Discoveries by Anna N. Żytkow Category:Discoveries by Michael J. Irwin Category:Named minor planets Category:New Horizons 19940512 Category:Named TNOs