1236 Thaïs

Asteroid March 2020 yes 1236 Thaïs #D6D6D6 001236-asteroid shape model (1236) Thaïs.png Modelled shape of Thaïs from its lightcurve 6 November 1931 G. Neujmin Simeiz Obs. (1236) Thaïs ˈ θ eɪ . ɪ sThaïs 1931 VX1957 LQ1964 JH1965 WA Thaïs (ancient Greek hetaira) main-belt(inner) background 16 February 2017 (JD 2457800.5) 0 84.57 yr (30,888 days) 3.0192 AU 1.8455 AU 2.4323 AU 0.2413 3.79 yr (1,386 days) 216.42° 0.2598 ms / day 13.169° 48.618° 305.94° 14.43 4.75 km17.18 4.94 km19.163 1.790 km20.07 0.41 km22.34 1.3 km (IRAS:7) 72 h 0.0599 0.007 (IRAS:7)0.075 0.0040.0813 0.01590.10 0.070.11 0.11 Tholen = TB–V = 0.785U–B = 0.383 11.9111.93 1236 Thaïs ˈ θ eɪ . ɪ s (prov. designation: 1931 VX) is a dark background asteroid from the inner regions of the asteroid belt. The rare T-type asteroid has a notably long rotation period of 72 hours and measures approximately 18 km mi off 2 us. It was discovered on 6 November 1931, by Soviet astronomer Grigory Neujmin at Simeiz Observatory on the Crimean peninsula, and named after the ancient Greek prostitute Thaïs. Orbit and classification Thaïs is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements. It orbits the Sun in the inner main-belt at a distance of 1.8–3.0 AU once every 3 years and 9 months (1,386 days). Its orbit has an eccentricity of 0.24 and an inclination of 13° with respect to the ecliptic. The body's observation arc begins at the discovering observatory, one month after its official discovery observation, as no precoveries were taken, and no prior identifications were made. Naming This minor planet was named after Thaïs, the famous Greek hetaera (ancient prostitute), who lived during the time of Alexander the Great (356–323 BC) and accompanied him on his campaigns. It is also the name of the protagonist in the novel Thaïs by French poet Anatole France. Physical characteristics Spectral type Thaïs is a dark and reddish T-type asteroid in the Tholen taxonomic scheme. It has also been classified as a L-type asteroid by PanSTARRS large-scale survey. Rotation period As of 2017, the only existing lightcurve of Thaïs gives a rotation period of 72 hours with a brightness variation of 0.08 magnitude (U=1). The fragmentary light curve was obtained by Austrian astronomers from photoelectric observations in the early 1980s. While not being a slow rotator, it has a significantly longer-than average rotation period, if future observations confirm the tentative results. Diameter and albedo According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Thaïs measures between 14.43 and 22.34 kilometers in diameter, and its surface has an albedo between 0.06 and 0.11. The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.0599 and a diameter of 22.34 kilometers based on an absolute magnitude of 11.93. References 30em 2016-06-04 last obs. JPL Small-Body Database Browser: 1236 Thais (1931 VX) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001236 Jet Propulsion Laboratory 25 January 2017 Dictionary of Minor Planet Names https://archive.org/details/dictionaryminorp00schm limited Schmadel Lutz D. Springer Berlin Heidelberg (1236) Thaïs 103 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1237 1236 Thais (1931 VX) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1236 25 January 2017 1236 25 January 2017 E. F. Tedesco P. V. Noah M. Noah S. D. Price October 2004 IRAS Minor Planet Survey V6.0 https://sbnarchive.psi.edu/pds3/iras/IRAS_A_FPA_3_RDR_IMPS_V6_0/data/diamalb.tab NASA Planetary Data System 12 IRAS-A-FPA-3-RDR-IMPS-V6.0 2004PDSS...12.....T 22 October 2019 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. 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 25 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 H. J. Schober A. Schroll April 1983 Rotation properties of the high-numbered asteroids 1236 Thais and 1317 Silvretta http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=1983A&A...120..106S Astronomy and Astrophysics 120 1 106–108 0004-6361 1983A&A...120..106S 25 January 2017 Asteroid 1236 Thais Small Bodies Data Ferret https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=1236+Thais 15 March 2020 https://web.archive.org/web/20201004033939/https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=1236+Thais 4 October 2020 dead Asteroid 1236 Thais – Proper Elements AstDyS-2, Asteroids – Dynamic Site https://newton.spacedys.com/astdys/index.php?pc=1.1.6&n=1236 15 March 2020 External links Lightcurve Database Query (LCDB), at www.minorplanet.info 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 – Geneva Observatory, Raoul Behrend Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center 1236 1235 Schorria 1236 1237 Geneviève 001236 Category:Discoveries by Grigory Neujmin Category:Named minor planets 001236 19311106