163693 Atira

Asteroid April 2018 yes 163693 Atira #FFC2E0 Atira.20jan17.u2.s1p0.gif Arecibo discovery image of orbiting satellite taken on 20 January 2017 11 February 2003 LINEAR Lincoln Lab ETS (163693) Atira 2003 CP 20 ə ˈ t ɪr əpaw ətíɾəʔ Pawnee: Atíra "my/our mother" (Pawnee epithet of the earth goddess)Douglas Parks & Lula Pratt, A Dictionary of Skiri Pawnee, University of Nebraska Press, 2008. atira, AISRI Dictionary Database Search, Indiana University. NEO Atira Venus-crosser 23 March 2018 (JD 2458200.5) 0 14.21 yr (5,192 d) 0.9798 AU 0.5024 AU 0.7411 AU 0.3221 233 days 30.769° 1.5449 ms / day 25.618° 103.90° 252.93° 0.2076 AU (80.88 LD) 1D: 1.0 0.3 km P: 15.5 h Type: synchronous 4.8 .5 km 3.3984 0.0006 h -50 ° 192 ° 0.0231 (derived) S (assumed) 16.3 163693 Atira (ə ˈ t ɪr ə; provisional designation 2003 CP 20) is a stony asteroid, dwelling in the interior of Earth's orbit. It is classified as a near-Earth object. Atira is a binary asteroid, a system of two asteroids orbiting their common barycenter. The primary component with a diameter of approximately 4.8 km mi off 1 us is orbited by a minor-planet moon that measures about 1 km mi on 1 us. Atira was discovered on 11 February 2003, by astronomers with the Lincoln Near-Earth Asteroid Research at Lincoln Laboratory's Experimental Test Site near Socorro, New Mexico, in the United States. To date, it is the only confirmed binary asteroid that orbits inside Earth's orbit.Deleon Aaron P. Marshall Sean E. Becker Tracy M. Pravec Petr Howell Ellen S. Nolan Michael C. Virkki Anne K. Rivera-Valentín Edgard G. Taylor Patrick A. Bolin Bryce T. Aponte-Hernández Beth Cabrera Israel Kušnirák Peter Hornoch Kamil Kučáková Hana 2024-10-23 Physical and Mutual Orbit Characteristics of Near-Earth Binary Asteroid (163693) Atira The Planetary Science Journal en 5 10 235 10.3847/PSJ/ad7814 free 2024PSJ.....5..235D 2632-3338 10138/591595 free It is the namesake and the first numbered body of the Atira asteroids, a new subclass of near-Earth asteroids, which have their orbits entirely within that of Earth and are therefore alternatively called Interior-Earth Objects (IEO). As of 2019, there are only 36 known members of the Atira group of asteroids.de la Fuente Marcos Carlos de la Fuente Marcos Raúl 1 August 2019 Understanding the evolution of Atira-class asteroid 2019 AQ3, a major step towards the future discovery of the Vatira population Monthly Notices of the Royal Astronomical Society 487 2 2742–2752 https://academic.oup.com/mnras/article-abstract/487/2/2742/5498309 1905.08695 2019MNRAS.487.2742D 10.1093/mnras/stz1437 free Atiras are similar to the larger group of Aten asteroids, as both are near-Earth objects and both have a semi-major axis smaller than that of Earth (< 1.0 AU). However, and contrary to Aten asteroids, the aphelion for Atiras is always smaller than Earth's perihelion (< 0.983 AU), which means that they do not approach Earth as close as Atens do in general. Atira has an Earth minimum orbit intersection distance of 0.2059 AU km on 3 or approximately 80.1 lunar distances. Physical properties Atira is a S-type asteroid and orbits the Sun at a distance of 0.5–1.0 AU once every 8 months (233 days). Its orbit has an eccentricity of 0.32 and an inclination of 26° with respect to the ecliptic. With a perihelion of 0.50 AU the body also classifies as a Venus-crosser as Venus orbits the Sun at a distance of 0.72–0.73 AU but does not get as close to the Sun as Mercury (which orbits between 0.31 and 0.47 AU). As no precoveries were found, Atiras observation arc begins with its discovery observation in 2003. It has a rotation period of 3.3984 hours with a brightness variation of 0.36 magnitude (U=2) and a very low albedo of 0.0231. With a diameter of 4.8 kilometers, Atira is one of the largest Near-Earth objects. Early estimates of its size ranged from 1 to 2 kilometers, but those were based on an assumed higher albedo of 0.20. Its larger size and low albedo were discovered when Atira was imaged by radar in early 2017. These radar images also revealed that Atira is a binary asteroid. Binary system thumb|left|Arecibo follow-up observations from 23 January 2017 Atira came within 0.207 AU km on 3 from Earth in January 2017, the closest since its discovery in 2003. This provided an opportunity to study the asteroid by radar. Images taken at Arecibo Observatory on 20 January 2017 revealed that Atira is a synchronous binary asteroid with a minor-planet moon. The primary with a diameter of 4.8 0.5 km is possibly elongated and very angular in shape. The secondary is tidally locked and has a diameter of 1.0 0.3 km. Additional images taken on 23 January 2017 showed that the two components are orbiting each other at a distance of about 6 km with an orbital period of 15.5 hours. It is currently the only confirmed binary asteroid that orbits inside Earth's orbit. Name Because the first known object in a new class of asteroids will become the name of the new class, due consideration was given to the name for (163693). The other classes of near-Earth asteroids, Amors, Apollos, and Atens, are named after a Roman, Greek, and Egyptian god respectively, each of which begins with the letter 'A'. Atira follows this pattern, being named after Atíra [paw ətíɾəʔ], an epithet of the Earth goddess of the Pawnee people. Atíra is the wife of the creator god, Tirawa, and goddess of Earth and the evening star. The official naming citation was published by the Minor Planet Center on 22 January 2008 (M.P.C. 61768). See also 594913 ꞌAylóꞌchaxnim (the first-known asteroid always inside Venus' orbit) References 2017-04-30 last obs. JPL Small-Body Database Browser: 163693 Atira (2003 CP20) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2163693 Jet Propulsion Laboratory 21 April 2018 163693 Atira (2003 CP20) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=163693 21 April 2018 MPC/MPO/MPS Archive - MPC 61609-61916 (2008/01/22) - page160 Minor Planet Center https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html 21 April 2018 Asteroids with Satellites Database (163693) Atira Johnston's Archive 19 February 2017 Johnston, Wm. Robert https://www.johnstonsarchive.net/astro/astmoons/am-163693.html 21 April 2018 163693 29 May 2017 Wm. Robert Johnston Names of Solar System objects and features 24 August 2006 https://www.johnstonsarchive.net/astro/names.html 11 November 2016 Shoemaker, E. M. December 1982 Asteroid and comet bombardment of the earth Annual Review of Earth and Planetary Sciences 11 461–494 1983AREPS..11..461S 10.1146/annurev.ea.11.050183.002333 https://newton.spacedys.com/neodys2/index.php?pc=1.1.9&n=Atira (163693) Atira PHYSICAL INFORMATION NEODyS: Near Earth Objects Dynamic Site 29 May 2017 NEO Groups http://neo.jpl.nasa.gov/neo/groups.html https://web.archive.org/web/20020202160655/http://neo.jpl.nasa.gov/neo/groups.html dead 2 February 2002 Jet Propulsion Laboratory 9 December 2015 Discovery Announcement of Binary System (163693) Atira http://outreach.naic.edu/ao/blog/discovery-announcement-binary-system-163693-atira Arecibo Observatory 29 May 2017 7 February 2020 https://web.archive.org/web/20200207092803/http://outreach.naic.edu/ao/blog/discovery-announcement-binary-system-163693-atira dead E. G. Rivera-Valentin P. A. Taylor A. Virkki B. Aponte-Hernandez January 2017 (163693) Atira Central Bureau Electronic Telegrams 4347 1 2017CBET.4347....1R Ancient Gods & Goddesses https://godfinder.org/index.html?page=3 www.godfinder.org 29 May 2017 Lincoln Laboratory discovers inner Earth orbit asteroids https://www.ll.mit.edu/news/atira.html Lincoln Observatory, MIT 29 May 2017 https://web.archive.org/web/20151010134026/http://www.ll.mit.edu/news/atira.html 10 October 2015 dead etal Aaron P. Deleon Tracy M. Becker Sean E. Marshall Petr Pravec Kamil Hornoch Hana Kučáková Characterization of Asteroid (163693) Atira with Arecibo Radar and Multi-Epoch Photometric Observations https://www.hou.usra.edu/meetings/lpsc2023/pdf/1685.pdf 54th Lunar and Planetary Science Conference 2023 Lunar and Planetary Institute March 2023 1685 4 February 2023 External links Photo at klet.org Facts Sheet (163693) Atira, European Asteroid Research Node (EARN) 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 with Satellites, Robert Johnston, johnstonsarchive.net Discovery Circumstances Numbered Minor Planets (160001)–(165000) 163693 163693 163693 163693 Category:Named minor planets 163693 163693 20030211