(85182) 1991 AQ

Near-Earth asteroid April 2018 yes (85182) 1991 AQ #FFC2E0 E. F. Helin Palomar Obs. 14 January 1991 (85182) 1991 AQ 1994 RD ApolloNEOPHA 23 March 2018 (JD 2458200.5) 0 26.91 yr (9,829 d) 3.9474 AU 0.4960 AU 2.2217 AU 0.7768 3.31 yr (1,210 d) 64.916° 0.2976 ms / day 3.1276° 339.68° 242.96° 0.0165 AU (6.428 LD) 1.1 km1.14 km (derived) 0.18 (assumed)0.242 0.194 Q (Tholen) 17.117.20 (85182) 1991 AQ is a stony asteroid on a highly eccentric orbit, classified as a near-Earth object and potentially hazardous asteroid of the Apollo group, approximately 1.1 km mi off 1 us in diameter. It was discovered on 14 January 1991, by American astronomer Eleanor Helin at the Palomar Observatory in California. Based on its brightness variation of 0.69 magnitude, this Q-type asteroid is likely elongated. It belongs to the small group of potentially hazardous asteroids larger than one kilometer. Orbit and classification 1991 AQ is a member of the Earth-crossing class of Apollo asteroids, the largest group of near-Earth objects with approximately 10 thousand known members. It is also a Venus- and Mars-crosser due to its extreme perihelion and aphelion, respectively. It orbits the Sun at a distance of 0.5–3.9 AU once every 3 years and 4 months (1,210 days; semi-major axis of 2.22 AU). Its orbit has a high eccentricity of 0.78 and an inclination of 3° with respect to the ecliptic. The body's observation arc begins with its official discovery observation at Palomar in 1991. Close approaches The asteroid has currently an Earth minimum orbital intersection distance of 0.0165 AU km mi on off 3, which corresponds to 6.4 lunar distances and makes it a potentially hazardous asteroid due to its notably large size. In 1991 and 1994, it approached Earth at a nominal distance of 0.054 AU LD on. The asteroids closest encounter with Earth is projected to occur on 27 January 2130, at a distance of 0.0106 AU LD on only (see table). It also makes close encounters to Mercury, Venus, Mars and Jupiter. Physical characteristics In the Tholen classification, this object is an uncommon Q-type asteroid, that falls into the larger stony S-complex. As of 2018, no rotational lightcurve of this asteroid has been obtained from photometric observations. The body's rotation period, pole and shape remain unknown. It has a brightness variation of 0.69 magnitude, indicative for an elongated, non-spherical shape. Diameter and albedo According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, this asteroid measures 1.1 kilometers in diameter and its surface has an albedo of 0.242. The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.18 and derives a diameter of 1.14 kilometers based on an absolute magnitude of 17.20. Numbering and naming This minor planet was numbered by the Minor Planet Center on 30 August 2004 (M.P.C. 52517). As of 2018, it has not been named. References 30em 2017-12-12 last obs. JPL Small-Body Database Browser: 85182 (1991 AQ) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2085182 Jet Propulsion Laboratory 21 April 2018 JPL Small-Body Database Browser: 85182 (1991 AQ) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2085182;cad=1#cad Jet Propulsion Laboratory 21 April 2018 85182 (1991 AQ) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=85182 21 April 2018 MPC/MPO/MPS Archive Minor Planet Center https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html 21 April 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 85182 21 April 2018 External links List of the Potentially Hazardous Asteroids (PHAs), Minor Planet Center PHA Close Approaches To The Earth, Minor Planet Center Asteroid Lightcurve Database (LCDB), query form (info https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html 16 December 2017 ) 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 85182 85182 1991AQ 2085182 85182 85183 Marcelaymé 085182 Category:Discoveries by Eleanor F. Helin 085182 19910114