17 Thetis

Main-belt asteroid June 2017 yes 17 Thetis #D6D6D6 24px|class=skin-invert|𜻊 (historical) 17Thetis-LB1.jpg Star field showing asteroid Thetis in the center 17 April 1852 R. Luther Düsseldorf-Bilk Obs. (17) Thetis 1954 SO 1A913 CAA916 YF ˈ θ iː t ᵻ sNoah Webster (1884) A Practical Dictionary of the English Language Thetidian θ ɛ ˈ t ɪ d i ə nHerbert (1828) Nimrod: a discourse on certain passages of history and fable, vol. 2 Thetis (Greek mythology) main-belt(inner) 16 February 2017 (JD 2457800.5) 0 164.55 yr (60,102 days) 2.7987 AU 2.1436 AU 2.4712 AU 0.1325 3.88 yr (1,419 days) 100.44° 0.2537 ms / day 5.5902° 125.56° 136.10° 18.87 km/s 84.899 2.02790 3.7km (IRAS)93.335 2.627 1.2318 kgThetismass2007 3.21 0.92 g/cm3 12.27048 0.00001 0.193 0.028 B–V = 0.829U–B = 0.438S (Tholen)Sl (SMASS)S 7.767.85 alt=Lightcurve-base 3D-model of 17 Thetis.|thumb|Lightcurve-base 3D-model of 17 Thetis. 17 Thetis is a stony asteroid from the inner regions of the asteroid belt, approximately 90 kilometers in diameter. It was discovered on 17 April 1852, by German astronomer Robert Luther at Bilk Observatory in Düsseldorf, Germany who deferred to Friedrich Wilhelm August Argelander the naming his first asteroid discovery after Thetis from Greek mythology. Its historical symbol was a dolphin and a star; it was encoded in Unicode 17.0 as U+1CECA 𜻊 (12px|class=skin-invert).https://www.unicode.org/L2/L2023/23207-historical-asteroids.pdf Unicode request for historical asteroid symbols Bala Gavin Jared Miller Kirk 18 September 2023 unicode.org Unicode 26 September 2023 Miscellaneous Symbols Supplement 2025 unicode.org The Unicode Consortium https://www.unicode.org/charts/PDF/U1CEC0.pdf September 9, 2025 Description The asteroid orbits the Sun at a distance of 2.1–2.8 AU once every 3 years and 11 months (1,419 days). Its orbit has an eccentricity of 0.13 and an inclination of 6° with respect to the ecliptic. The spectrum of this object indicates that it is an S-type asteroid with both low and high calcium forms of pyroxene on the surface, along with less than 20% olivine. The high-calcium form of pyroxene forms 40% or more of the total pyroxene present, indicating a history of igneous rock deposits. This suggests that the asteroid underwent differentiation by melting, creating a surface of basalt rock. The mass of Thetis has been calculated from perturbations by 4 Vesta and 11 Parthenope. In 2007, Baer and Chesley calculated Thetis to have a mass of 1.2318 kgThetismass2007 with a density of 3.21 g/cm3. One Thetidian stellar occultation was observed from Oregon in 1999. However, the event was not timed. This minor planet was named after Thetis, the mother of Achilles in Greek mythology. Notes Thetismass2007 Mass of Thetis = 6.17 0.64 -13 References 2016-11-11 last obs. JPL Small-Body Database Browser: 17 Thetis https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2000017 Jet Propulsion Laboratory 24 March 2017 Dictionary of Minor Planet Names – (17) Thetis Schmadel Lutz D. Springer Berlin Heidelberg 17 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_18 17 Thetis Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=17 24 March 2017 Jessica M. Sunshine Schelte J. Bus Timothy J. McCoy Thomas H. Burbine Catherine M. Corrigan Richard P. Binzel August 2004 High-calcium pyroxene as an indicator of igneous differentiation in asteroids and meteorites Meteoritics and Planetary Science 39 8 1343–1357 2004M&PS...39.1343S 10.1111/j.1945-5100.2004.tb00950.x James Baer Steven R. Chesley January 2008 Astrometric masses of 21 asteroids, and an integrated asteroid ephemeris Celestial Mechanics and Dynamical Astronomy 100 1 27–42 2008CeMDA.100...27B 10.1007/s10569-007-9103-8 free 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 The Astrophysical Journal 791 2 11 2014ApJ...791..121M 10.1088/0004-637X/791/2/121 1406.6645 17 24 March 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 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 30 October 2019 6 T. Michalowski F. P. Velichko M. Di Martino Yu. N. Krugly V. G. Kalashnikov V. G. Shevchenko P. V. Birch W. D. Sears P. Denchev T. Kwiatkowski December 1995 Models of four asteroids: 17 Thetis, 52 Europa, 532 Herculina, and 704 Interamnia. Icarus 118 2 292–301 1995Icar..118..292M 10.1006/icar.1995.1192 External links 2011-Apr-22 Occultation (Durech Model) / (2011 Asteroidal Occultation Results for North America) 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 – (17) Thetis https://web.archive.org/web/20021203194843/http://obswww.unige.ch/~behrend/page1cou.html#000017 3 December 2002 at Observatoire de Genève, Raoul Behrend Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center 17 16 Psyche 17 18 Melpomene Category:Background asteroids Thetis Thetis Category:S-type asteroids (Tholen) Category:Sl-type asteroids (SMASS) 18520417