15224 Penttilä

Main-belt asteroid November 2025 yes 15224 Penttilä #D6D6D6 E. Bowell Anderson Mesa Stn. 15 May 1985 (15224) Penttilä 1985 JG1970 HB2000 HR 19 Antti Penttilä(Finnish astronomer) main-belt(inner)background 27 April 2019 (JD 2458600.5) 0 48.02 yr (17,539 d) 3.0019 AU 1.8313 AU 2.4166 AU 0.2422 3.76 yr (1,372 d) 356.13° 0.2624 ms / day 12.350° 70.116° 196.23° 7.924 0.119 km8.79 3.79 km9.60 2.05 km 4.377 0.001 h 0.04 - 0.085 13.8013.914.13 15224 Penttilä (provisional designation 1985 JG) is a dark background asteroid from the inner regions of the asteroid belt, approximately 8 km mi off 1 us in diameter. It was discovered on 15 May 1985, by American astronomer Edward Bowell at Lowell's Anderson Mesa Station in Arizona, United States. The likely elongated asteroid has a rotation period of 4.4 hours. It was named after planetary scientist Antti Penttilä at the University of Helsinki. Orbit and classification Penttilä is a non-family asteroid from the main belt's background population. It orbits the Sun in the inner asteroid belt at a distance of 1.8–3.0 AU once every 3 years and 9 months (1,372 days; semi-major axis of 2.42 AU). Its orbit has an eccentricity of 0.24 and an inclination of 12° with respect to the ecliptic. The body's observation arc begins with its first observation, a precovery taken at the Crimean Astrophysical Observatory in April 1970, or 15 years prior to its official discovery observation at Anderson Mesa Station. Naming This minor planet was named for Finnish postdoctoral researcher Antti Penttilä (born 1977) at the University of Helsinki, an expert on light reflection and absorption on the surface of small Solar System bodies such as asteroids and cometary nuclei, as well as of the cosmic dust released by cometary comae. The official 15224 naming citation was published on 12 July 2014 (M.P.C. 89081). Physical characteristics The asteroid's spectral type has not been determined. Due to its low geometric albedo, it likely a carbonaceous C-type asteroid (see below). Rotation period In June 2015, a rotational lightcurve was obtained for this asteroid from photometric observations by astronomer Daniel Klinglesmith at Etscorn Campus Observatory 719, New Mexico. Lightcurve analysis gave a rotation period of 4.377 0.001 hours with a brightness variation of 0.55 in magnitude (U=3-), indicative of a non-spherical, elongated shape. Previously, in August 2012, a concurring period of 4.3771 0.0064 hours with an amplitude of 0.46 was determined from observations in the R-band by astronomers at the Palomar Transient Factory, California (U=2). Diameter and albedo According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Penttilä measures between 7.9 and 9.6 kilometers in diameter and its surface has an albedo between 0.04 and 0.085. The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20, and hence calculates a smaller diameter of 4.9 kilometers. References 30em 4 May 2018 last obs. JPL Small-Body Database Browser: 15224 Penttila (1985 JG) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2015224 Jet Propulsion Laboratory 5 December 2018 15224 Penttila (1985 JG) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=15224 5 December 2018 MPC/MPO/MPS Archive Minor Planet Center https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html 5 December 2018 Asteroid (15224) Penttila – Proper elements AstDyS-2, Asteroids – Dynamic Site https://newton.spacedys.com/astdys/index.php?n=15224&pc=1.1.6 4 December 2018 Asteroid 15224 Penttila Small Bodies Data Ferret https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=15224+Penttila 5 December 2018 October 2026 InternetArchiveBot 6 Joseph R. Masiero A. K. Mainzer T. Grav J. M. Bauer R. M. Cutri J. Dailey P. R. M. Eisenhardt R. S. McMillan T. B. Spahr M. F. Skrutskie D. Tholen R. G. Walker E. L. Wright E. DeBaun D. Elsbury T. IV Gautier S. Gomillion A. Wilkins November 2011 Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters The Astrophysical Journal 741 2 20 2011ApJ...741...68M 10.1088/0004-637X/741/2/68 1109.4096 118745497 15224 5 December 2018 6 Joseph R. Masiero A. K. Mainzer T. Grav J. M. Bauer R. M. Cutri C. Nugent M. S. Cabrera November 2012 Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids The Astrophysical Journal Letters 759 1 5 2012ApJ...759L...8M 10.1088/2041-8205/759/1/L8 1209.5794 46350317 6 A. K. Mainzer J. M. Bauer R. M. Cutri T. Grav E. A. Kramer J. R. Masiero C. R. Nugent S. M. Sonnett R. A. Stevenson E. L. Wright June 2016 NEOWISE Diameters and Albedos V1.0 https://sbnarchive.psi.edu/pds3/non_mission/EAR_A_COMPIL_5_NEOWISEDIAM_V1_0/data/neowise_mainbelt.tab NASA Planetary Data System EAR-A-COMPIL-5-NEOWISEDIAM-V1.0 2016PDSS..247.....M 5 December 2018 6 C. R. Nugent A. Mainzer J. Bauer R. M. Cutri E. A. Kramer T. Grav J. Masiero S. Sonnett E. L. Wright September 2016 NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos The Astronomical Journal 152 3 12 2016AJ....152...63N 10.3847/0004-6256/152/3/63 1606.08923 free 6 A. Mainzer T. Grav J. Masiero E. Hand J. Bauer D. Tholen R. S. McMillan T. Spahr R. M. Cutri E. Wright J. Watkins W. Mo C. Maleszewski November 2011 NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results The Astrophysical Journal 741 2 25 2011ApJ...741...90M 10.1088/0004-637X/741/2/90 1109.6407 35447010 (catalog) Daniel A. III Klinglesmith Jesse Hanowell Sebastian Hendrickx Karl Madden Samuel Montgomery October 2015 Asteroids Observed at Etscorn Observatory: 2015 April - June The Minor Planet Bulletin 42 4 251–252 1052-8091 2015MPBu...42..251K 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 (15001)-(20000) – Minor Planet Center 15224 (15223) 1984 SN4 15224 (15225) 1985 RJ4 015224 Category:Discoveries by Edward L. G. Bowell Category:Named minor planets 19850515