1511 Daléra

Main-belt asteroid October 2019 yes 1511 Daléra #D6D6D6 22 March 1939 L. Boyer Algiers Obs. (1511) Dalera 1939 FB1928 DB1954 LM Paul Daléra(friend of discoverer) main-belt(inner) 21 November 2025 (JD 2461000.5) 0 88.75 yr (32,415 days) 2.6132 AU 2.1023 AU 2.3577 AU 0.1083 3.62 yr (1,322 days) 332.98° 0.2722 ms / day 4.067° 81.704° 96.833° 1.1094 au 2.354 au 7.15 km (calculated)11.36 3.14 km13.515 0.231 km18.23 1.28 km 3.880 0.001 h3.881 0.001 h4.2227 0.0011 h 0.08 0.0110.080 0.0110.10 0.050.20 (assumed) S 12.644 0.002 (R)12.7012.812.9913.09 1511 Daléra (provisional designation 1939 FB) is an asteroid from the inner regions of the asteroid belt, approximately 12 kilometers in diameter. It was discovered on 22 March 1939, by French astronomer Louis Boyer at the Algerian Algiers Observatory, North Africa, and named after Paul Daléra, a friend of the discoverer. Classification and orbit Daléra orbits the Sun in the inner main-belt at a distance of 2.1–2.6 AU once every 3 years and 7 months (1,323 days). Its orbit has an eccentricity of 0.11 and an inclination of 4° with respect to the ecliptic. It was first identified as 1928 DB at Heidelberg Observatory in 1928, extending the body's observation arc by 11 years prior to its official discovery observation. Physical characteristics Rotation period In March 2015, three rotational lightcurves of Daléra were independently obtained by Italian astronomers Maurizio Scardella (D06), Fabio Salvaggio (K54, A81), and Giovanni Casalnuovo (C62) after being reported as a light-curve photometry opportunity at minorplanet.info (CALL). They gave a rotation period of 3.880 and 3.881 hours with a brightness variation of 0.18 and 0.14 magnitude, respectively (U=2/3-/2-). Previously, photometric observations at the Palomar Transient Factory in September 2013, gave a longer period of 4.2227 hours and an amplitude of 0.14 magnitude (U=2). Diameter and albedo According to the surveys carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Daléra measures between 11.36 and 18.23 kilometers in diameter, and its surface has an albedo between 0.03 and 0.10. The Collaborative Asteroid Lightcurve Link assumes a standard albedo for S-type asteroids of 0.20 and calculates a diameter of 7.15 kilometers based on an absolute magnitude of 13.09. However, based on the low albedos (0.03, 0.08, 0.10) determined by WISE/NEOWISE, Daléra is not a stony but rather a carbonaceous asteroid, which are uncommon in the inner main-belt. Naming This minor planet was named after Paul Daléra, a friend of the discovering astronomer Louis Boyer. The official naming citation was first mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 135) References 2016-11-23 last obs. JPL Small-Body Database Browser: 1511 Dalera (1939 FB) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001511 Jet Propulsion Laboratory 5 June 2017 Dictionary of Minor Planet Names – (1511) Daléra Schmadel Lutz D. Springer Berlin Heidelberg 120 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1512 (1511) Daléra 1511 Dalera (1939 FB) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1511 4 January 2017 1511 4 January 2017 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 http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012ApJ...759L...8M The Astrophysical Journal Letters 759 1 5 2012ApJ...759L...8M 10.1088/2041-8205/759/1/L8 1209.5794 46350317 4 January 2017 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 http://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 4 January 2017 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 Maurizio Scardella Francesco Franceschini Angelo Tomassini July 2015 Rotational Period of 1511 Dalera http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015MPBu...42Q.216S The Minor Planet Bulletin 42 3 216 1052-8091 2015MPBu...42Q.216S 4 January 2017 Fabio Salvaggio Alessandro Marchini Lorenzo Franco July 2015 Rotation Period Determination for 1511 Dalera and 2271 Kiso http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015MPBu...42..226S The Minor Planet Bulletin 42 3 226–227 1052-8091 2015MPBu...42..226S 4 January 2017 Casalnuovo, Giovanni Battista April 2016 Lightcurve Analysis for Nine Main Belt Asteroids http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2016MPBu...43..112C The Minor Planet Bulletin 43 2 112–115 1052-8091 2016MPBu...43..112C 4 January 2017 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 http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015AJ....150...75W The Astronomical Journal 150 3 35 2015AJ....150...75W 10.1088/0004-6256/150/3/75 1504.04041 8342929 4 January 2017 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 1511 1510 Charlois 1511 1512 Oulu 001511 Category:Discoveries by Louis Boyer (astronomer) Category:Named minor planets 19390322