(392741) 2012 SQ31

Main-belt asteroid yes (392741) 2012 SQ 31 #D6D6D6 Spacewatch Kitt Peak National Obs. 11 August 2004 / 27 December 2009 (392741) 2012 SQ 31 2004 PR 1072009 YS 20 main-belt(inner)Flora 23 March 2018 (JD 2458200.5) 0 14.22 yr (5,193 d) 2.5806 AU 1.9412 AU 2.2609 AU 0.1414 3.40 yr (1,242 d) 208.16° 0.2899 ms / day 3.8552° 77.991° 317.17° 0.69 km (est. at 0.24) 0.24 (assumed) 18.0 (392741) 2012 SQ 31 is a sub-kilometer Florian asteroid from the inner regions of the asteroid belt, approximately 700 m ft off us 2 in diameter. It was originally considered a trans-Neptunian object and lost minor planet during 2004–2012. The date of the official discovery was later set to 27 December 2009, and credited to astronomers of the Spacewatch program conducted at the Kitt Peak National Observatory near Tucson, Arizona, in the United States. Orbit and classification 2012 SQ 31 is a member of the Flora family (402), a giant asteroid family and the largest family of stony asteroids in the main-belt.23 It orbits the Sun in the inner asteroid belt at a distance of 1.9–2.6 AU once every 3 years and 5 months (1,242 days; semi-major axis of 2.26 AU). Its orbit has an eccentricity of 0.14 and an inclination of 4° with respect to the ecliptic. The body's observation arc begins with a precovery taken at Haleakala-AMOS, Hawaii, in December 2005, four years prior to its official discovery observation. Trans-Neptunian object On 11 August 2004, the asteroid was already observed as 2004 PR 107 by astronomers at the Cerro Tololo Inter-American Observatory in Chile, but became a lost minor planet until 2012 due to a lack of follow-up observations. During this time, and with only two observations taken on the same day, it was thought to be a trans-Neptunian object with a semi-major axis of 46 AU. Michael Brown listed it as a likely dwarf planet on his website with an estimated diameter of 555 kilometers based on an absolute magnitude of 4.6 and an assumed albedo of 0.09. In 2009, the lost asteroid was observed again as 2009 YS 20, but was not identified at the time as being related to 2004 PR 107. In 2012, it was finally rediscovered under its principal designation, reclassified as a small main-belt asteroid, and numbered two years later (see below). Physical characteristics 2012 SQ 31 has been characterized as a member of the Flora family, which are stony S-type asteroids with albedo typically around 0.24, corresponding to that of the family's parent body, 8 Flora.23 Based on a generic magnitude-to-diameter conversion, 2012 SQ 31 measures 690 meters for an absolute magnitude of 18.0 and an assumed albedo of 0.24. As of 2018, no rotational lightcurve has been obtained from photometric observations. The asteroid's rotation period, poles and shape remain unknown. Numbering and naming This minor planet was numbered by the Minor Planet Center on 15 April 2014 (M.P.C. 87941). As of 2018, it has not been named. See also 2010 GZ 60 – main-belt asteroid originally misidentified as a near-Earth object 2006 HH 123 – misidentified nonexistent minor planet References 30em 2017-02-22 last obs. JPL Small-Body Database Browser: 392741 (2012 SQ31) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2392741 Jet Propulsion Laboratory 3 March 2018 https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2004PR107 392741 (2012 SQ31 = 2004 PR107) JPL Small-Body Database Browser 22 June 2012 https://archive.today/20121213182632/http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2004PR107 13 December 2012 live dmy-all MPEC 2004-R15 : 2003 QF113, 2004 OJ14, 2004 PR107, 2004 PS107, 2004 PT107 IAU Minor Planet Center 4 September 2004 https://www.minorplanetcenter.net/mpec/K04/K04R15.html 3 March 2018 (K04PA7R) http://www.gps.caltech.edu/~mbrown/dps.html How many dwarf planets are there in the outer solar system? Brown Mike Michael E. Brown California Institute of Technology 22 June 2012 dead https://web.archive.org/web/20111018154917/http://www.gps.caltech.edu/~mbrown/dps.html 18 October 2011 392741 (2012 SQ31) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=392741 3 March 2018 MPC/MPO/MPS Archive Minor Planet Center https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html 3 March 2018 Asteroid (392741) 2012 SQ31 – Nesvorny HCM Asteroid Families V3.0 Small Bodies Data Ferret https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=392741#Asteroid%20392741EAR-A-VARGBDET-5-NESVORNYFAM-V3.0 27 October 2019 October 2026 InternetArchiveBot D. Nesvorný M. Broz V. Carruba December 2014 Identification and Dynamical Properties of Asteroid Families Asteroids IV 297–321 2015aste.book..297N 10.2458/azu_uapress_9780816532131-ch016 1502.01628 9780816532131 119280014 Asteroid Size Estimator CNEOS NASA/JPL https://cneos.jpl.nasa.gov/tools/ast_size_est.html 12 November 2017 External links Asteroid Lightcurve Database (LCDB), query form (info https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html 2017-12-16 ) Discovery Circumstances: Numbered Minor Planets (390001)-(395000) – Minor Planet Center 392741 392741 (392741) 2012 SQ 31 392741 392741 20091227 20040811 Category:Former dwarf planet candidates