(7025) 1993 QA

Sub-kilometer asteroid classified as a near-Earth object October 2019 yes (7025) 1993 QA #FFC2E0 Spacewatch Kitt Peak National Obs. 16 August 1993 (7025) 1993 QA NEOApolloAmor 4 September 2017 (JD 2458000.5) 0 22.88 yr (8,358 days) 1.9405 AU 1.0111 AU 1.4758 AU 0.3149 1.79 yr (655 days) 25.431° 0.5498 ms / day 12.607° 146.64° 323.39° 0.0645 AU25.1 LD 0.498 0.171 km0.77 km (derived) 2.5057 h 0.20 (assumed)0.340 0.234 DS 17.9418.0018.318.75 0.47 (7025) 1993 QA is a sub-kilometer asteroid classified as a near-Earth object of the Apollo and Amor group, respectively. It was discovered on 16 August 1993, by astronomers of the Spacewatch program at the Kitt Peak National Observatory near Tucson, Arizona, United States. The asteroid measures approximately half a kilometer in diameter and has a short rotation period of 2.5057 hours. Orbit and classification 1993 QA is a member of the dynamical Apollo group, which are Earth-crossing asteroids. Conversely, it is classified as a non-Earth crossing Amor asteroid by the Minor Planet Center, due to its near-threshold perihelion of 1.011 AU. It orbits the Sun at a distance of 1.01–1.94 AU once every 21 months (655 days; semi-major axis of 1.48 AU). Its orbit has an eccentricity of 0.31 and an inclination of 13° with respect to the ecliptic. The body's observation arc begins with its official discovery observation by Spacewatch on 16 August 1993. Close approaches The asteroid has an Earth minimum orbital intersection distance of 0.0645 AU km on on 3, which translates into 25.1 lunar distances. On 6 February 1996 it transited Earth at a nominal distance of 0.07080 AU km mi on off 3 flip. The body's next encounter with Earth below 0.1 AU will occur on 24 January 2025, at a distance of 0.06275 AU km mi on off 3 flip. Physical characteristics 1993 QA has been characterized as a dark D-type asteroid on images taken by the Sloan Digital Sky Survey. Conversely, Pan-STARRS photometric survey determined a much brighter S-type. Rotation period In the late 1990s, two rotational lightcurves of 1993 QA were obtained from photometric observations by European astronomers. Lightcurve analysis gave an identical, well-defined rotation period of 2.5057 hours with a brightness amplitude of 0.32 and 0.50 magnitude, respectively (U=3/3). Its period is near the cohesionless spin-barrier of 2.2 hours, which set the upper limit for fast-rotating asteroids. Diameter and albedo According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, 1993 QA measures 498 meters in diameter and its surface has a high albedo of 0.340. The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and derives a diameter of 770 meters based on an absolute magnitude of 17.94. Naming As of 2018, this minor planet has not been named yet. References 30em 2016-07-04 last obs. JPL Small-Body Database Browser: 7025 (1993 QA) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2007025 Jet Propulsion Laboratory 25 January 2018 7025 (1993 QA) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=7025 25 January 2018 7025 25 January 2018 6 C. R. Nugent A. Mainzer J. Masiero J. Bauer R. M. Cutri T. Grav E. Kramer S. Sonnett R. Stevenson E. L. Wright December 2015 NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos The Astrophysical Journal 814 2 13 2015ApJ...814..117N 10.1088/0004-637X/814/2/117 1509.02522 9341381 Petr Pravec Marek Wolf Lenka Sarounová November 1998 Lightcurves of 26 Near-Earth Asteroids Icarus 136 1 124–153 1998Icar..136..124P 10.1006/icar.1998.5993 6 Yu. N. Krugly I. N. Belskaya V. G. Shevchenko V. G. Chiorny F. P. Velichko S. Mottola A. Erikson G. Hahn A. Nathues G. Neukum N. M. Gaftonyuk E. Dotto August 2002 The Near-Earth Objects Follow-up Program. IV. CCD Photometry in 1996-1999 Icarus 158 2 294–304 2002Icar..158..294K 10.1006/icar.2002.6884 B. Carry E. Solano S. Eggl F. E. DeMeo April 2016 Spectral properties of near-Earth and Mars-crossing asteroids using Sloan photometry Icarus 268 340–354 2016Icar..268..340C 10.1016/j.icarus.2015.12.047 1601.02087 119258489 6 Peter Veres Robert Jedicke Alan Fitzsimmons Larry Denneau Mikael Granvik Bryce Bolin Serge Chastel Richard J. Wainscoat William S. Burgett Kenneth C. Chambers Heather Flewelling Nick Kaiser Eugen A. Magnier Jeff S. Morgan Paul A. Price John L. Tonry Christopher Waters November 2015 Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results Icarus 261 34–47 2015Icar..261...34V 10.1016/j.icarus.2015.08.007 1506.00762 53493339 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 7025 7025 1993QA 7025 007025 007025 007025 19930816