(219774) 2001 YY145

Main-belt asteroid June 2018 yes (219774) 2001 YY 145 #D6D6D6 18 December 2001 LONEOS Anderson Mesa Stn. (219774) 2001 YY 145 2005 TA 170 main-belt(middle)background 23 March 2018 (JD 2458200.5) 0 15.92 yr (5,815 d) 2.9215 AU 2.2404 AU 2.5810 AU 0.1320 4.15 yr (1,515 d) 48.043° 0.2377 ms / day 9.6001° 315.61° 18.718° 1.54 km (calculated) 1007.6706 86.3718 h 0.20 (assumed) S (assumed) 15.915.977 0.011 (R)16.43 (219774) 2001 YY 145 is a stony background asteroid and exceptionally slow rotator from the central region of the asteroid belt, approximately 1.5 km mi off 1 us in diameter. It was discovered on 18 December 2001, by astronomers with the Lowell Observatory Near-Earth-Object Search at Anderson Mesa Station near Flagstaff, Arizona, in the United States. The assumed S-type asteroid is likely elongated and has a rarely seen rotation period of 1007 hours, making it the 13th slowest rotator. Orbit and classification 2001 YY 145 is a non-family asteroid from the main belt's background population. It orbits the Sun in the central main-belt at a distance of 2.2–2.9 AU once every 4 years and 2 months (1,515 days; semi-major axis of 2.58 AU). Its orbit has an eccentricity of 0.13 and an inclination of 10° with respect to the ecliptic. A first precovery was taken at Lincoln Lab's ETS in October 2001, extending the asteroid's observation arc by 2 months prior to its official discovery observation at Anderson Mesa. Physical characteristics The object is an assumed, common S-type asteroid. Slow rotator In October 2013, a rotational lightcurve was obtained of this asteroid from photometric observations in the R-band by astronomers at the Palomar Transient Factory in California. It gave a rotation period of 1007.7 hours – or nearly 42 days – with an assigned error margin of ±86 hours. According to the Light Curve Data Base, it is the 13th slowest rotating minor planet known to exist among more than 15,000 observed small Solar System bodies. Due to its high brightness variation of 0.86 magnitude, the body is likely to have a non-spheroidal shape (U=2). As of 2018, no follow-up observation have been published. Diameter and albedo The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 1.54 kilometers, based on an absolute magnitude of 16.43. Numbering and naming This minor planet was numbered by the Minor Planet Center on 4 October 2009. As of 2018, it has not been named. References 30em 2017-09-26 last obs. JPL Small-Body Database Browser: 219774 (2001 YY145) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2219774 Jet Propulsion Laboratory 6 June 2018 219774 (2001 YY145) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=219774 6 June 2018 MPC/MPO/MPS Archive Minor Planet Center https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html 24 February 2018 Asteroid (219774) – Proper elements AstDyS-2, Asteroids – Dynamic Site https://newton.spacedys.com/astdys/index.php?n=219774&pc=1.1.6 25 May 2018 Asteroid (219774) 2001 YY145 Small Bodies Data Ferret https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=219774 6 June 2018 219774 13 September 2016 6 Adam Waszczak Chan-Kao Chang Eran O. Ofek Russ Laher Frank Masci David Levitan Jason Surace Yu-Chi Cheng Wing-Huen Ip Daisuke Kinoshita George Helou Thomas A. Prince Shrinivas Kulkarni September 2015 Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry The Astronomical Journal 150 3 35 2015AJ....150...75W 10.1088/0004-6256/150/3/75 1504.04041 8342929 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 Discovery Circumstances: Numbered Minor Planets (215001)-(220000) – Minor Planet Center 219774 219774 (219774) 2001 YY 145 219774 219774 219774 20011218