1938 Lausanna

Stony main-belt asteroid October 2019 yes 1938 Lausanna #D6D6D6 19 April 1974 P. Wild Zimmerwald Obs. (1938) Lausanna 1974 HC1934 KA1947 DB1950 CO1955 VK1957 EH1962 WB 11967 ED 11971 OX1972 XY 1 Lausanne (Swiss city) main-beltFlora 4 September 2017 (JD 2458000.5) 0 82.99 yr (30,312 days) 2.5938 AU 1.8796 AU 2.2367 AU 0.1597 3.35 yr (1,222 days) 329.17° 0.2946 ms / day 3.3343° 171.69° 64.830° 7.638 0.124 km7.82 km (calculated)8.214 0.077 km 2.748 0.001 hLCDB-Skiff-20142.748 0.001 h 0.1660 0.03010.192 0.0550.24 (assumed) S 12.60 0.2612.713.0 1938 Lausanna, provisional designation 1974 HC, is a stony Florian asteroid from the inner regions of the asteroid belt. It is approximately 8 kilometers in diameter, and was discovered on 19 April 1974 by Swiss astronomer, Paul Wild at Zimmerwald Observatory near Bern, Switzerland. It is named for the city of Lausanne. Orbit and classification Lausanna is a S-type asteroid and member of the Flora family, one of the largest collisional populations of stony asteroids in the main-belt. It orbits the Sun in the inner main-belt at a distance of 1.9–2.6 AU once every 3 years and 4 months (1,222 days). Its orbit has an eccentricity of 0.16 and an inclination of 3° with respect to the ecliptic. It was first identified as 1934 KA at Johannesburg Observatory in 1934, extending the body's observation arc by 40 years prior to its official discovery observation at Zimmerwald. Physical characteristics Rotation period In March 2014, two rotational lightcurves of Lausanna were obtained from photometric observations by American astronomer Brian Skiff and by Johan Warell at Lindby Observatory (K60) in Sweden. Lightcurve analysis gave an identical rotation period of 2.748 hours with a brightness amplitude of 0.13 and 0.12 magnitude, respectively (U=3-/2).LCDB-Skiff-2014 The short period is near the threshold of 2.2 hours for fast rotating asteroids. Diameter and albedo According to the space-based survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Lausanna measures 7.64 and 8.21 kilometers in diameter, and its surface has an albedo of 0.166 and 0.192, respectively. The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – derived from 8 Flora, the largest member and namesake of its family – and calculates a diameter of 7.82 kilometers based on an absolute magnitude of 12.7. Naming This minor planet was named for the Swiss city of Lausanne, located in the French-speaking part of the country. The discoverer Paul Wild, known for his unconventional minor-planet namings, discovered three more asteroids during winter of 1973/74. He named these 1935 Lucerna, 1936 Lugano and 1937 Locarno, after the Swiss cities Lucerne, Lugano and Locarno, respectively, hence composing an alliterated quartet of sequentially numbered, thematically named minor planets. The official 1938 naming citation was published by the Minor Planet Center on 1 April 1978 (M.P.C. 4358). Notes LCDB-Skiff-2014 Skiff (2014) web: rotation period 2.748 0.001 hours with a brightness amplitude of 0.13 mag and a Quality Code of 3-. Summary figures at Collaborative Asteroid Lightcurve Link (CALL) for (1938) Lausanna References 30em 2017-05-06 last obs. JPL Small-Body Database Browser: 1938 Lausanna (1974 HC) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001938 Jet Propulsion Laboratory 10 June 2017 Dictionary of Minor Planet Names – (1938) Lausanna Schmadel Lutz D. Springer Berlin Heidelberg 155 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1939 (1938) Lausanna 1938 Lausanna (1974 HC) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1938 26 January 2017 Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008) 2009 https://archive.org/details/dictionaryminorp2008schm limited 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 26 January 2017 1938 26 January 2017 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 Johan Warell Riccardo Pappini January 2015 Rotational Period of 1938 Lausanna http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015MPBu...42...20W The Minor Planet Bulletin 42 1 20–21 1052-8091 2015MPBu...42...20W 26 January 2017 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 26 January 2017 External links Asteroid Lightcurve Database (LCDB), query form (info https://web.archive.org/web/20110721225144/http://www.minorplanet.info/lightcurvedatabase.html 21 July 2011 ) 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 1938 1937 Locarno 1938 1939 Loretta 001938 Category:Discoveries by Paul Wild (Swiss astronomer) Category:Named minor planets 001938 19740419