14827 Hypnos

Asteroid October 2019 yes 14827 Hypnos #FFC2E0 C. S. ShoemakerE. M. Shoemaker Palomar Obs. 5 May 1986 (14827) Hypnos 1986 JK ' h I p n Q s Hypnos(Greek god of sleep) ApolloNEOPHA 4 September 2017 (JD 2458000.5) 0 19.32 yr (7,058 days) 4.7318 AU 0.9491 AU 2.8405 AU 0.6659 4.79 yr (1,749 days) 206.81° 0.2059 ms / day 1.9808° 57.976° 238.09° 0.0147 AU5.7 LD 0.5249 AU 0.520 0.260 km>0.74 km0.9 km (Gehrels 1994)0.907 km (derived) 0.057 (assumed)<0.067 (radar)0.22 0.17 CB–V 0.684U–B 0.492 18.318.65 0.2218.94 14827 Hypnos (provisional designation: 1986 JK) is a highly eccentric, sub-kilometer-sized carbonaceous asteroid that is thought to be an extinct comet. It is classified as a near-Earth object and potentially hazardous asteroid of the Apollo group. The asteroid was discovered by American astronomer couple Carolyn and Eugene Shoemaker at the Palomar Observatory in California on 5 May 1986. It was named after Hypnos, the Greek god of sleep. Orbit and classification thumb|left|200px|Comet-like orbit of Hypnos with a high eccentricity of 0.67 Hypnos orbits the Sun at a distance of 0.9–4.7 AU once every 4 years and 9 months (1,749 days). Its orbit has a high eccentricity of 0.67 and an inclination of 2° with respect to the ecliptic. It is frequently perturbed by Jupiter. The body's observation arc begins at Anderson Mesa Station the night prior to its official discovery observation at Palomar. Close approaches As a near-Earth object and potentially hazardous asteroid Hypnos has an Earth minimum orbital intersection distance of 0.0147 AU km on 3, which corresponds to 5.7 lunar distances. In 1958, Hypnos passed less than 0.03 AU from both Earth and Mars. Neither planet has been approached so closely by Hypnos since the 862 AD pass of Earth, or will be until the 2214 pass of Earth.September 2017 It is also a Mars-crosser. Extinct comet Hypnos may be the nucleus of an extinct comet that is covered by a crust several centimeters thick that prevents any remaining volatiles from outgassing. Physical characteristics Hypnos is an assumed carbonaceous C-type asteroid. Lightcurves As of 2018, no rotational lightcurve of Hypnos has been obtained from photometric observations. The asteroids rotation period and spin axis remains unknown. It has a low brightness amplitude of 0.05 magnitude which indicates that the body has a rather spheroidal shape. Diameter and albedo According to the NEOSurvey carried out by NASA's Spitzer Space Telescope, Hypnos measures 520 meters in diameter and its surface has an albedo of 0.22 based on an absolute magnitude of 18.65, while infrared radiometry gave a radar albedo of no more than 0.067 and a diameter of at least 740 meters. The Collaborative Asteroid Lightcurve Link assumes a standard optical albedo for carbonaceous asteroids 0.057 and derives a diameter of 907 meters with an absolute magnitude of 18.94. The diameter agrees with Tom Gehrels 1994-publication Hazards due to Comets and Asteroids in which he estimated a mean diameter of 900 meters for Hypnos. Naming This minor planet was named after Hypnos from Greek mythology. He is the god of sleep, son of Nyx and Erebus and twin brother of Thanatos. He enters the sleep of mortals and gives them dreams of foolishness or inspiration. The English word "hypnosis" is derived from his name. The official naming citation was published by the Minor Planet Center on 6 January 2003 (M.P.C. 47301). Exploration Hypnos was a potential target for the LICIACube extended mission,LICIACube 1585556947595661313 Michèle Lavagna: "Il lavoro di #LICIACube non finisce qui, abbiamo uno strumento prezioso e funzionante e ora stiamo decidendo verso quali corpi celesti orientarlo" but contact was lost shortly after completion of the primary mission. References 30em 2005-08-30 last obs. JPL Small-Body Database Browser: 14827 Hypnos (1986 JK) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2014827 Jet Propulsion Laboratory 12 September 2017 Dictionary of Minor Planet Names – (14827) Hypnos, Addendum to Fifth Edition: 2003–2005 Schmadel Lutz D. (14827) Hypnos [2.84, 0.67, 2.0] Springer Berlin Heidelberg 88 2006 978-3-540-34361-5 10.1007/978-3-540-34361-5_896 14827 Hypnos (1986 JK) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=14827 12 September 2017 MPC/MPO/MPS Archive Minor Planet Center https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html 12 September 2017 NEA Radar Albedo Ranking Lance Benner 3 April 2012 Asteroid Radar Research http://echo.jpl.nasa.gov/~lance/asteroid_radar_properties/nea.radaralbedo.html https://web.archive.org/web/20001006232551/http://echo.jpl.nasa.gov/~lance/asteroid_radar_properties/nea.radaralbedo.html 6 October 2000 12 September 2017 Kathryn Whitman Alessandro Morbidelli Robert Jedicke July 2006 The size frequency distribution of dormant Jupiter family comets http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2006Icar..183..101W Icarus 183 1 101–114 2006Icar..183..101W 10.1016/j.icarus.2006.02.016 12 September 2017 astro-ph/0603106 14026673 NEODys (14827) Hypnos Department of Mathematics, University of Pisa http://newton.spacedys.com/neodys/index.php?pc=1.1.8&n=Hypnos 12 September 2017 last observation: 2000-10-25 JPL Close-Approach Data: 14827 Hypnos (1986 JK) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=Hypnos;cad=1#cad 2009-05-06 14827 12 September 2017 6 David E. Trilling Michael Mommert Joseph Hora Steve Chesley Joshua Emery Giovanni Fazio Alan Harris Michael Mueller Howard Smith December 2016 NEOSurvey 1: Initial Results from the Warm Spitzer Exploration Science Survey of Near-Earth Object Properties The Astronomical Journal 152 6 10 2016AJ....152..172T 10.3847/0004-6256/152/6/172 1608.03673 free Wisniewski, W. Z. June 1987 Photometry of six radar target asteroids http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=1987Icar...70..566W Icarus 70 3 566–572 0019-1035 1987Icar...70..566W 10.1016/0019-1035(87)90096-0 12 September 2017 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/20160729213840/http://obswww.unige.ch/~behrend/page_cou.html 29 July 2016 – Observatoire de Genève, Raoul Behrend 14827 14827 Hypnos 14826 Nicollier 14827 (14828) 1986 QT1 014827 Category:Discoveries by Eugene Merle Shoemaker Category:Discoveries by Carolyn S. Shoemaker Category:Named minor planets 014827 014827 19860505