1565 Lemaître

Mars-crossing asteroid October 2019 yes 1565 Lemaître #FA8072 25 November 1948 S. Arend Uccle Obs. (1565) Lemaitre 1948 WA Georges Lemaître(astronomer, priest) Mars-crosserPhocaea 4 September 2017 (JD 2458000.5) 0 68.44 yr (24,997 days) 3.2262 AU 1.5613 AU 2.3938 AU 0.3478 3.70 yr (1,353 days) 236.28° 0.2661 ms / day 21.485° 261.16° 116.34° 6.90 1.45 km7.949 1.558 km8.00 0.58 km8.76 km (calculated) 2.4 0.1 h11.403 0.003 h 0.22 0.140.23 (assumed)0.239 0.0960.334 0.051 SMASS = SqS 12.3012.512.95 1565 Lemaître (provisional designation 1948 WA) is a highly eccentric Phocaea asteroid and sizable Mars-crosser from the inner regions of the asteroid belt, approximately 8 kilometers in diameter. It was discovered on 25 November 1948, by Belgian astronomer Sylvain Arend at the Royal Observatory of Belgium in Uccle, Belgium. It was named after cosmologist and priest Georges Lemaître. Classification and orbit Lemaître is a Mars-crossing asteroid, as it crosses the orbit of Mars at 1.666 AU. It is also an eccentric member of the Phocaea family (701). This asteroid orbits the Sun at a distance of 1.6–3.2 AU once every 3 years and 8 months (1,353 days). Its orbit has an eccentricity of 0.35 and an inclination of 21° with respect to the ecliptic. As no precoveries were taken, and no prior identifications were made, Lemaître's observation arc begins on the night following its official discovery observation. Physical characteristics In the SMASS taxonomy, Lemaître is characterized as a Sq-type, a transitional class of stony S-type and Q-type asteroids. Lightcurves In September 2007, a rotational light-curve of Lemaître was obtained from photometric observations by American astronomer Brian D. Warner at his Palmer Divide Observatory, Colorado. It gave a rotation period of 11.403 hours with a brightness variation of 0.04 magnitude (U=2), superseding a provisional period of 2.4 hours with an amplitude of 0.03 magnitude, derived from photometric observations made by Arnaud Leroy, Bernard Trégon, Xavier Durivaud and Federico Manzini two months earlier (U=1+). Diameter and albedo According to the surveys carried out by the Japanese Akari satellite and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Lemaître measures between 6.90 and 8.00 kilometers in diameter, and its surface has an albedo between 0.22 and 0.334. The Collaborative Asteroid Lightcurve Link assumes a standard albedo for Phocaea asteroids of 0.23 – derived from 25 Phocaea, the family's most massiv member and namesake – and calculates a diameter of 8.76 kilometers based on an absolute magnitude of 12.5. Naming This minor planet was named in honour of Belgian priest, astronomer and professor of physics, Georges Lemaître (1894–1966), widely regarded as the father of the Big Bang theory. The lunar crater Lemaître also bears his name. Lemaître was the first minor planet to be numbered after the end of World War II. The official 1565 naming citation was published by the Minor Planet Center on 1 June 1975 (M.P.C. 3824). References 30em 2017-05-04 last obs. JPL Small-Body Database Browser: 1565 Lemaitre (1948 WA) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001565 Jet Propulsion Laboratory 5 June 2017 Dictionary of Minor Planet Names – (1565) Lemaître Schmadel Lutz D. Springer Berlin Heidelberg 124 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1566 (1565) Lemaître 1565 Lemaitre (1948 WA) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1565 30 December 2016 Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008) Appendix – Publication Dates of the MPCs Schmadel Lutz D. 2009 Springer Berlin Heidelberg 221 978-3-642-01964-7 10.1007/978-3-642-01965-4 2009dmpn.book.....S Asteroids and comets rotation curves – (1565) Lemaître Behrend Raoul Geneva Observatory https://obswww.unige.ch/~behrend/page4cou.html#001565 30 December 2016 October 2026 InternetArchiveBot Asteroid 1565 Lemaitre – Nesvorny HCM Asteroid Families V3.0 Small Bodies Data Ferret https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=1565+Lemaitre#Asteroid%201565%20LemaitreEAR-A-VARGBDET-5-NESVORNYFAM-V3.0 26 October 2019 https://web.archive.org/web/20200820071958/https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=1565+Lemaitre#Asteroid%201565%20LemaitreEAR-A-VARGBDET-5-NESVORNYFAM-V3.0 20 August 2020 dead 1565 30 December 2016 6 Fumihiko Usui Daisuke Kuroda Thomas G. Müller Sunao Hasegawa Masateru Ishiguro Takafumi Ootsubo Daisuke Ishihara Hirokazu Kataza Satoshi Takita Shinki Oyabu Munetaka Ueno Hideo Matsuhara Takashi Onaka October 2011 Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey Publications of the Astronomical Society of Japan 63 5 1117–1138 2011PASJ...63.1117U 10.1093/pasj/63.5.1117 (online, AcuA catalog p. 153) 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 https://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015ApJ...814..117N The Astrophysical Journal 814 2 13 2015ApJ...814..117N 10.1088/0004-637X/814/2/117 1509.02522 9341381 30 December 2016 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 Brian D. Warner Gary A. Vander Haagen June 2008 Lightcurve Analysis of 1565 Lemaitre https://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2008MPBu...35...52W The Minor Planet Bulletin 35 2 52 1052-8091 2008MPBu...35...52W 30 December 2016 External links Lightcurve plot of 1565 Lemaitre, Palmer Divide Observatory, B. D. Warner (2007) 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/20241208174218/http://obswww.unige.ch/~behrend/page_cou.html 8 December 2024 – Observatoire de Genève, Raoul Behrend Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center 1565 1564 Srbija 1565 1566 Icarus 001565 001565 Category:Discoveries by Sylvain Arend Category:Named minor planets 001565 19481125