1568 Aisleen

Main-belt asteroid October 2019 yes 1568 Aisleen #D6D6D6 1568Aisleen (Lightcurve Inversion).png Lightcurve-based 3D-model of Aisleen padding: 5px 0; line-height: 1.2em; 21 August 1946 E. L. Johnson Johannesburg Obs. (1568) Aisleen 1946 QB Aisleen Johnson(discoverer's wife) main-beltPhocaea 4 September 2017 (JD 2458000.5) 0 70.70 yr (25,824 days) 2.9502 AU 1.7557 AU 2.3529 AU 0.2538 3.61 yr (1,318 days) 221.76° 0.2731 ms / day 24.867° 146.18° 229.03° 11.983 0.072 km12.448 0.084 km12.49 2.52 km12.67 km (calculated)14.04 0.96 km 6.67597 0.00005 h6.68 0.02 h6.683 0.005 h 0.130 0.0190.165 0.0280.1793 0.03220.21 0.060.23 (assumed) S 11.57 0.2111.712.112.14 1568 Aisleen (provisional designation 1946 QB) is a stony Phocaea asteroid from the inner regions of the asteroid belt, approximately 12.5 kilometers in diameter. It was discovered on 21 August 1946, by South African astronomer Ernest Johnson at Johannesburg Observatory in South Africa. It is named for the discoverer's wife, Aisleen Johnson. Orbit and classification The S-type asteroid is a member of the Phocaea family (701), a group of asteroids with similar orbital characteristics. It orbits the Sun at a distance of 1.8–3.0 AU once every 3 years and 7 months (1,318 days). Its orbit has an eccentricity of 0.25 and an inclination of 25° with respect to the ecliptic. As no precoveries were taken, and no prior identifications were made, Aisleen's observation arc begins with its official discovery observation at Johannesburg. Physical characteristics Rotation and pole In August 2000, a rotational lightcurve of Aisleen was obtained from photometric observations made by Glen Malcolm at the Roach Motel Observatory (856) in California. The analysis gave a well-defined rotation period of 6.68 hours during which the brightness varied by 0.56 in magnitude (U=3). In April 2014, photometric observations by Brian D. Warner gave a period of 6.683 hours with an amplitude of 0.31 magnitude (U=3). A modeled lightcurve from various data sources gave a concurring period of 6.67597 hours and found a pole of (109°,−68°). 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, Aisleen measures between 11.98 and 14.04 kilometers in diameter, and its surface has an albedo between 0.130 and 0.21. 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 12.67 kilometers based on an absolute magnitude of 11.7. Naming This minor planet was named by the discoverer for his wife, Aisleen Johnson. The official 1568 naming citation was published by the Minor Planet Center on 31 January 1962 (M.P.C. 2116). References 2017-05-04 last obs. JPL Small-Body Database Browser: 1568 Aisleen (1946 QB) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001568 Jet Propulsion Laboratory 5 June 2017 Dictionary of Minor Planet Names – (1568) Aisleen Schmadel Lutz D. Springer Berlin Heidelberg 124 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1569 (1568) Aisleen 1568 Aisleen (1946 QB) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1568 29 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 Warner, Brian D. October 2014 Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2014 March–June http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014MPBu...41..235W The Minor Planet Bulletin 41 4 235–241 32457965 7249532 1052-8091 2014MPBu...41..235W 2 January 2016 Valerio Carruba D. A. Rosa September 2009 An Analysis of the Region of the Phocaea Dynamical Family http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2009DPS....41.2704C American Astronomical Society, DPS Meeting #41, #27.04 41 27.04 2009DPS....41.2704C 29 December 2016 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 119293330 29 December 2016 Asteroid 1568 Aisleen – Nesvorny HCM Asteroid Families V3.0 Small Bodies Data Ferret https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=1568+Aisleen#Asteroid%201568%20AisleenEAR-A-VARGBDET-5-NESVORNYFAM-V3.0 26 October 2019 https://web.archive.org/web/20201107150146/https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=1568+Aisleen#Asteroid%201568%20AisleenEAR-A-VARGBDET-5-NESVORNYFAM-V3.0 7 November 2020 dead 1568 29 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 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 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 Malcolm, G. December 2001 Rotational Periods and Lightcurves of 1166 Sakuntala and 1568 Aisleen http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2001MPBu...28...64M The Minor Planet Bulletin 28 64 2001MPBu...28...64M 29 December 2016 6 Hanus, J. Durech, J. Broz, M. Warner, B. D. Pilcher, F. Stephens, R. Oey, J. Bernasconi, L. Casulli, S. Behrend, R. Polishook, D. Henych, T. Lehký, M. Yoshida, F. Ito, T. June 2011 A study of asteroid pole-latitude distribution based on an extended set of shape models derived by the lightcurve inversion method http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011A&A...530A.134H Astronomy & Astrophysics 530 16 2011A&A...530A.134H 10.1051/0004-6361/201116738 1104.4114 29 December 2016 6 Peter Veres Robert Jedicke Alan Fitzsimmons Larry Denneau Mikael Granvik Bryce Bolin Serge Chastel Richard J. Wainscoat William S. Burgett Kenneth C. Chambers Heather Flewelling Nick Kaiser Eugen A. Magnier Jeff S. Morgan Paul A. Price John L. Tonry Christopher Waters November 2015 Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015Icar..261...34V Icarus 261 34–47 2015Icar..261...34V 10.1016/j.icarus.2015.08.007 1506.00762 53493339 29 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/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 1568 1567 Alikoski 1568 1569 Evita 001568 Category:Discoveries by Ernest Leonard Johnson Category:Named minor planets 19460821