1542 Schalén

Main-belt asteroid October 2019 yes 1542 Schalén #D6D6D6 001542-asteroid shape model (1542) Schalén.png Shape model of Schalén from its lightcurve 26 August 1941 Y. Väisälä Turku Obs. (1542) Schalén 1941 QE1927 BH1936 UL1940 LP1976 CAA898 VDA924 NA Karl Schalén (astronomer) main-beltbackground 16 February 2017 (JD 2457800.5) 0 117.73 yr (43,001 days) 3.4510 AU 2.7343 AU 3.0926 AU 0.1159 5.44 yr (1,987 days) 284.94° 0.1812 ms / day 2.7662° 211.66° 42.374 0.273 km45.05 km (derived)48.998 0.480 km 7.516 0.002 h 0.0501 (derived)0.0509 0.01050.068 0.003 SMASS = D 10.410.6 1542 Schalén (provisional designation 1941 QE) is a background asteroid from the outer region of the asteroid belt, approximately 45 kilometers in diameter. It was discovered on 26 August 1941, by Finnish astronomer Yrjö Väisälä at Turku Observatory in Southwest Finland. The dark D-type asteroid was later named after Swedish astronomer Karl Schalén. Orbit and classification Schalén is a background asteroid, located near the region of the Themis family, a dynamical family of outer-belt asteroids with nearly coplanar ecliptical orbits. It orbits the Sun at a distance of 2.7–3.5 AU once every 5 years and 5 months (1,987 days). Its orbit has an eccentricity of 0.12 and an inclination of 3° with respect to the ecliptic. It was first identified as A898 VD at Heidelberg Observatory in 1898, extending the body's observation arc by 43 years prior to its official discovery observation at Turku. Physical characteristics Schalén has a dark D-type spectrum, mostly found among Hildian asteroids and Jupiter trojans. Bodies with a D-type spectra are thought to have originated in the Kuiper belt. Diameter and albedo According to the 2014-result of the survey carried by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Schalén measures 42.374 kilometers in diameter and its surface has an albedo of 0.068, while the Collaborative Asteroid Lightcurve Link derives an albedo of 0.0509 and a diameter of 45.05 kilometers with an absolute magnitude of 10.6. Rotation period In November 2012, a rotational lightcurve of Schalén was obtained from photometric observations by astronomers at the Purple Mountain Observatory in collaboration with observatories in the United States. Lightcurve analysis gave a well-defined rotation period of 7.516 hours with a brightness variation of 0.49 magnitude (U=3). Naming This minor planet was named in honour of Swedish astronomer Karl Adam Wilhelm Schalén (1902–1993), who was a director of the Swedish Lund Observatory. The official 1542 naming citation was published by the Minor Planet Center on 20 February 1976 (M.P.C. 3930). References 30em 2016-08-08 last obs. JPL Small-Body Database Browser: 1542 Schalen (1941 QE) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001542 Jet Propulsion Laboratory 30 December 2016 Dictionary of Minor Planet Names – (1542) Schalén Schmadel Lutz D. Springer Berlin Heidelberg 122 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1543 (1542) Schalén 1542 Schalen (1941 QE) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1542 30 December 2016 Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008) Appendix – Publication Dates of the MPCs Schmadel Lutz D. Springer Berlin Heidelberg 221 978-3-642-01964-7 10.1007/978-3-642-01965-4 6 Joseph R. Masiero T. Grav A. K. Mainzer C. R. Nugent J. M. Bauer R. Stevenson S. Sonnett August 2014 Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014ApJ...791..121M The Astrophysical Journal 791 2 11 2014ApJ...791..121M 10.1088/0004-637X/791/2/121 1406.6645 30 December 2016 JPL Small-Body Database Search Engine: [ spec. type = D (Tholen) or spec. type = D (SMASSII) ] JPL Solar System Dynamics http://ssd.jpl.nasa.gov/sbdb_query.cgi?obj_group=all;obj_kind=all;obj_numbered=all;OBJ_field=0;ORB_field=0;combine_mode=OR;c1_group=OBJ;c1_item=Ay;c1_op=%3D;c1_value=D;c2_group=OBJ;c2_item=Ax;c2_op=%3D;c2_value=D;table_format=HTML;max_rows=100;format_option=comp;c_fields=AcBhBgBjBiBnBsAiArApAxAy;.cgifields=format_option;.cgifields=obj_kind;.cgifields=obj_group;.cgifields=obj_numbered;.cgifields=combine_mode;.cgifields=ast_orbit_class;.cgifields=table_format;.cgifields=com_orbit_class&query=1&c_sort=AcA 30 December 2016 1542 30 December 2016 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 Bin Li Haibin Zhao Xianming L. Han Daniel A. III Klinglesmith Jesse Hanowell April 2013 Photometric Observation of 1542 Schalen http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2013MPBu...40...68L The Minor Planet Bulletin 40 2 68–69 1052-8091 2013MPBu...40...68L 30 December 2016 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 Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center 1542 1541 Estonia 1542 1543 Bourgeois 001542 Category:Discoveries by Yrjö Väisälä Category:Named minor planets 001542 19410826