115 Thyra

Main-belt asteroid October 2019 yes #D6D6D6 115 Thyra 115Thyra (Lightcurve Inversion).png A three-dimensional model of 115 Thyra based on its lightcurve James Craig Watson 6 August 1871 (115) Thyra A871 PA ' θ aɪər əFrom 'Tyra', a variant of the name. Thyra Main belt 31 July 2016 (JD 2457600.5) 2.38077 AU Gm on 1.92394 AU Gm on 2.8376 AU Gm on on 0.19188 3.67 yr (1341.8 d) 11.595° 308.901° 96.946° 108.401° 19.13 km/s 79.83 1.4 km79.83 km 7.19 0.60 17 kgCalculated from its standard gravitational parameter GM = 0.048 0.004 km3 s2. 2.73 g/cm3 0.0223 m/s2 0.0422 km/s 7.241 h d on on S*JPL Small-Body Database Browser 7.51 0.2747 0.0100.275 ~180 K 0.26830 ms / day 143.31 yr (52344 d) 0 0.97246 AU Gm on 2.63437 AU Gm on 3.486 115 Thyra is a fairly large and bright inner main-belt asteroid that was discovered by Canadian-American astronomer J. C. Watson on August 6, 1871 and was named for Thyra, the consort of King Gorm the Old of Denmark. Based upon its spectrum, it is categorized as a stony S-type asteroid. Observations made between 1978 and 1981 produced a composite light curve with two minima and maxima. However, a subsequent study in 1983 only found a single minima and maxima. A synodical rotation period of 7.241 hours was determined. This was confirmed by observations between 1995 and 2000. The changes in brightness and color indicate a surface with an uneven composition. The asteroid has a slightly elongated shape, with a ratio of 1.20 between the lengths of the major and minor axes. The orbital longitude and latitude of the asteroid pole in degrees is estimated to be (λ0, β0) = (68°, 23°). Measurements of the thermal inertia of 115 Thyra give a value of around 75 m−2 K−1 s−1/2, compared to 50 for lunar regolith and 400 for coarse sand in an atmosphere. Notes References Numbered Minor Planets 1–5000 Discovery Circumstances IAU Minor Planet center https://www.minorplanetcenter.net/iau/lists/NumberedMPs000001.html 2013-04-07 . Donald K. Yeomans 115 Thyra JPL Small-Body Database Browser NASA Jet Propulsion Laboratory https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=115 12 May 2016 . Delbo' Marco Tanga Paolo Thermal inertia of main belt asteroids smaller than 100 km from IRAS data Planetary and Space Science 57 2 259–265 February 2009 10.1016/j.pss.2008.06.015 2009P&SS...57..259D . 0808.0869 14517561 Michałowski T. Kwiatkowski T. Kaasalainen M. Pych W. Kryszczyńska A. Dybczyński P. A. Velichko F. P. Erikson A. Denchev P. Fauvaud S. Szabó Gy. M. 1 Photometry and models of selected main belt asteroids I. 52 Europa, 115 Thyra, and 382 Dodona Astronomy and Astrophysics 416 353–366 March 2004 10.1051/0004-6361:20031706 2004A&A...416..353M . free Kryszczyńska A. La Spina A. Paolicchi P. Harris A. W. Breiter S. Pravec P. 1 New findings on asteroid spin-vector distributions Icarus 192 223–237 December 2007 1 10.1016/j.icarus.2007.06.008 2007Icar..192..223K . DeMeo Francesca E. Binzel Richard P. Slivan Stephen M. Bus Schelte J. 1 An extension of the Bus asteroid taxonomy into the near-infrared Icarus 202 1 160–180 July 2009 10.1016/j.icarus.2009.02.005 2009Icar..202..160D http://www.tara.tcd.ie/bitstream/2262/43276/1/PEER_stage2_10.1016%252Fj.icarus.2009.02.005.pdf 2013-04-08 . dead https://web.archive.org/web/20140317200310/https://www.tara.tcd.ie/bitstream/2262/43276/1/PEER_stage2_10.1016/j.icarus.2009.02.005.pdf 2014-03-17 See appendix A. Fuentes-Muñoz Oscar Farnocchia Davide Giorgini Jon D. Park Ryan S. 2025-12-01 Asteroid Mass Estimation by Mutual Perturbations During Close Encounters After Gaia Focused Product Release The Astronomical Journal 170 6 353 10.3847/1538-3881/ae0cc9 0004-6256 free 2025AJ....170..353F 283347135 External links 115 114 Kassandra 115 116 Sirona 000115 Category:Discoveries by James Craig Watson Category:Named minor planets 000115 000115 18710806