1310 Villigera

Mars-crossing asteroid October 2019 yes 1310 Villigera #FA8072 001310-asteroid shape model (1310) Villigera.png Modelled shape of Villigera from its lightcurve 28 February 1932 A. Schwassmann Bergedorf Obs. (1310) Villigera 1932 DB1964 TC Walther Villiger(Swiss astronomer) Mars-crosser 4 September 2017 (JD 2458000.5) 0 85.34 yr (31,171 days) 3.2438 AU 1.5424 AU 2.3931 AU 0.3555 3.70 yr (1,352 days) 76.690° 0.2662 ms / day 21.071° 357.32° 88.759° 0.2634 AU 13.76 1.38 km15.24 km (calculated) 7.830 0.005 hlightcurve-plot-Antelope-Hills7.83001 0.00005 h7.834 0.001 h 0.20 (assumed)0.245 0.049 Tholen = SSB–V = 0.905U–B = 0.445 11.45 1310 Villigera, provisional designation 1932 DB, is a stony asteroid and large Mars-crosser from the innermost regions of the asteroid belt, approximately 14 kilometers in diameter. It was discovered on 28 February 1932, by German astronomer Friedrich Schwassmann at Bergedorf Observatory in Hamburg, Germany. The asteroid was named after astronomer Walther Villiger. Orbit and classification Villigera is a Mars-crossing asteroid, a dynamically unstable group between the main belt and the near-Earth populations, crossing the orbit of Mars at 1.666 AU. It orbits the Sun in the inner main-belt at a distance of 1.5–3.2 AU once every 3 years and 8 months (1,352 days). Its orbit has an eccentricity of 0.36 and an inclination of 21° with respect to the ecliptic. No precoveries were taken, and no prior identifications were made. The body's observation arc begins 10 days after its official discovery observation with its first used observation at Uccle Observatory. Physical characteristics Villigera is a common S-type asteroid on the Tholen taxonomic scheme. Lightcurves In October 2001, a first rotational lightcurve of Villigera was obtained by astronomer Robert Koff at Thornton Observatory (713) in Colorado. Light curve analysis gave a well-defined rotation period of 7.830 hours with a brightness variation of 0.39 magnitude (U=3).lightcurve-plot-Antelope-Hills Photometric observations by astronomers René Roy, Raoul Behrend and Pierre Antonini in February 2006, gave a concurring period of 7.834 hours and an amplitude of 0.36 magnitude (U=3). In 2016, a modeled lightcurves using photometric data from various sources, rendered an identical period of 7.830 and a spin axis of (3.0°, 63°) in ecliptic coordinates. Diameter and albedo According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Villigera measures 13.76 kilometers in diameter and its surface has an albedo of 0.245. The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 15.24 kilometers, with an absolute magnitude of 11.45. Based on a generic magnitude-to-diameter conversion, Villigera measures between 13 and 30 kilometers for an albedo in the range of 0.05 to 0.25. This makes Villigera one of the largest mid-sized Mars-crossing asteroids comparable with 1065 Amundsenia (9.75 km), 1139 Atami (9.35 km), 1474 Beira (8.73 km), 1011 Laodamia (7.5 km), 1727 Mette (est. 9 km), 1131 Porzia (7 km), 1235 Schorria (est. 9 km), 985 Rosina (8.18 km) and 1468 Zomba (7 km), but smaller than the largest members of this dynamical group, namely, 132 Aethra, 323 Brucia, 1508 Kemi, 2204 Lyyli and 512 Taurinensis, which are all larger than 20 kilometers in diameter. Naming This minor planet was named in honour of Swiss astronomer Walther Villiger (1872–1938), who himself discovered the main-belt asteroid 428 Monachia at Munich in 1897. The official naming citation was also mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 120). Notes lightcurve-plot-Antelope-Hills Lightcurve plot of (1310) Villigera, Robert Koff, Thornton Observatory (713). Summary figures at LCDB References 30em 2017-07-02 last obs. JPL Small-Body Database Browser: 1310 Villigera (1932 DB) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001310 Jet Propulsion Laboratory 25 July 2017 Dictionary of Minor Planet Names – (1310) Villigera Schmadel Lutz D. Springer Berlin Heidelberg 107 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1311 (1310) Villigera 1310 Villigera (1932 DB) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1310 17 January 2017 Asteroids and comets rotation curves – (1310) Villigera Behrend Raoul Geneva Observatory http://obswww.unige.ch/~behrend/page4cou.html#001310 17 January 2017 3 August 2003 https://web.archive.org/web/20030803183423/http://obswww.unige.ch/~behrend/page4cou.html#001310 dead Absolute Magnitude (H) NASA/JPL http://neo.jpl.nasa.gov/glossary/h.html https://web.archive.org/web/20010302182040/http://neo.jpl.nasa.gov/glossary/h.html dead 2 March 2001 17 January 2017 1310 17 January 2017 Koff, R. A. June 2002 Lightcurve Photometry of 492 Gismonda, 1046 Edwin, and 1310 Villigera http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2002MPBu...29...25K The Minor Planet Bulletin 29 25–26 2002MPBu...29...25K 17 January 2017 6 J. Hanus J. Durech D. A. Oszkiewicz R. 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Wolf February 2016 New and updated convex shape models of asteroids based on optical data from a large collaboration network Astronomy and Astrophysics 586 24 2016A&A...586A.108H 10.1051/0004-6361/201527441 1510.07422 V. Alí-Lagoa M. Delbo' July 2017 Sizes and albedos of Mars-crossing asteroids from WISE/NEOWISE data https://www.aanda.org/articles/aa/pdf/2017/07/aa29917-16.pdf Astronomy and Astrophysics 603 8 2017A&A...603A..55A 10.1051/0004-6361/201629917 1705.10263 20 October 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 1310 1309 Hyperborea 1310 1311 Knopfia 001310 Category:Discoveries by Friedrich Karl Arnold Schwassmann Category:Named minor planets 001310 19320228