175 Andromache

Main-belt asteroid October 2019 yes (175) Andromache #D6D6D6 175 Andromache.png Lightcurve-based 3D model of 175 Andromache 175 Andromache A877 TA; 1893 KA;1895 XB; 1946 MB;1946 OD æ n ' d r ɒ m ə k iːNoah Webster (1884) A Practical Dictionary of the English Language Main belt J. C. Watson 1 October 1877 3.1853 AU Gm on 2.4442 AU Gm on 3.9264 AU Gm on on 5.69 yr (2076.5 d) 3.2184° 0.23267 8.324 h d on on C 8.068.31 0.0819 0.013October 2023 31 July 2016 (JD 2457600.5) 21.353° 320.41° 35.697° 0.17337 ms / day 138.18 yr (50472 d) 0 50.585 3.5 kmOctober 2023 1.43641 AU Gm on 1.4787 AU Gm on 3.153 Andromache 175 Andromache is a main-belt asteroid that was discovered by Canadian-American astronomer J. C. Watson on October 1, 1877. It was named after Andromache, wife of Hector during the Trojan War. Watson's telegram to Europe announcing the discovery became lost, and so notification did not arrive until several weeks later. As a result, another minor planet, later designated 176 Iduna, was initially assigned the number 175. The initial orbital elements for 175 Andromache proved unreliable, and it was only in 1893 that an accurate ephemeris was produced. Because the orbital period is fairly close to being double that of the giant planet Jupiter, 175 Andromache initially became of interest in the study of gravitational perturbations. This object is orbiting the Sun at a distance of 3.19 AU with an eccentricity of 0.23 and an orbital period of 5.69 years. The orbital plane is inclined at an angle of 3.2° to the plane of the ecliptic. Based upon its spectrum, this is classified as a C-type asteroid. It has a diameter estimated in the range 101–107 km with a roughly circular shape. The size ratio between the major and minor axes is 1.09 ± 0.09, as determined from the W. M. Keck Observatory. An earlier result published in 2000 gave a larger size ratio of 1.20. The asteroid is rotating on its axis with a period of 8.324 hours. References Leuschner A. O. The Story of Andromache, an Unruly Planet Publications of the Astronomical Society of the Pacific 48 282 57–60 10.1086/124659 1936PASP...48...55L . April 1936 free F. Marchis M. Kaasalainen E. F. Y. Hom J. Berthier J. Enriquez D. Hestroffer D. Le Mignant I. de Pater 1 Shape, size and multiplicity of main-belt asteroids. I. Keck Adaptive Optics survey Icarus 185 1 39–63 2006Icar..185...39M 10.1016/j.icarus.2006.06.001 . 19081813 2600456 November 2006 Donald K. Yeomans 175 Andromache JPL Small-Body Database Browser NASA Jet Propulsion Laboratory https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=175 6 May 2016 . Leuschner A. O. Comparison of Theory with Observation for the Minor planets 10 Hygiea and 175 Andromache with Respect to Perturbations by Jupiter Proceedings of the National Academy of Sciences of the United States of America 8 7 170–173 10.1073/pnas.8.7.170 1922PNAS....8..170L . 16586868 1085085 July 1922 free Warner Brian D. Initial Results of a Dedicated H-G Project The Minor Planet Bulletin 34 113–119 2007MPBu...34..113W . December 2007 4 Lazzarin M. Barbieri C. Barucci M. A. 1 Visible Spectroscopy of Dark, Primitive Asteroids Astronomical Journal 110 3058–3072 10.1086/117747 1995AJ....110.3058L . December 1995 free External links 175 174 Phaedra 175 176 Iduna Category:Background asteroids Andromache Andromache Category:C-type asteroids (Tholen) Category:Cg-type asteroids (SMASS) 18771001