Iota Aquilae is astar in theequatorialconstellation ofAquila. Its identifier is aBayer designation that isLatinized from ι Aquilae, and abbreviated Iota Aql or ι Aql. The star has the traditional nameAl Thalimain, pronounced/ælˌθælɪˈmeɪn/, which it shares withλ Aquilae. The name is derived from theArabic termالظليمینal-ẓalīmayn meaning "The Two Ostriches".[11] With anapparent visual magnitude of 4.364,[3] this star is bright enough to be seen with thenaked eye. Based upon an annualparallax shift of5.67±0.19 mas,[2] it is located at a distance of around 580light-years (180parsecs) from Earth.[2] The visual magnitude of the star is diminished by 0.15[7] fromextinction caused by intervening gas and dust.
In 1968, this star was assigned astellar classification of B5III,[4] which suggests it has which exhausted itshydrogen supply at itscore andevolved into ablue giant. However,stellar models from 2002 indicate it is around 100 million years old and has thus far spent 91% of its allotted lifetime on the main sequence.[7] In 2024, a study of standard stars suggested that Iota Aquilae be classified as B6 IV, matching asubgiant star.[5]
^abcdKozok, J. R. (September 1985), "Photometric observations of emission B-stars in the southern Milky Way",Astronomy and Astrophysics Supplement Series,61:387–405,Bibcode:1985A&AS...61..387K.
^abLesh, Janet Rountree (December 1968), "The Kinematics of the Gould Belt: an Expanding Group?",Astrophysical Journal Supplement,17: 371,Bibcode:1968ApJS...17..371L,doi:10.1086/190179.
^Mallama, A. (2014), "Sloan Magnitudes for the Brightest Stars",Journal of the American Association of Variable Star Observers (Jaavso),42 (2): 443,Bibcode:2014JAVSO..42..443M.
^abcdefghLyubimkov, Leonid S.; et al. (June 2002), "Surface abundances of light elements for a large sample of early B-type stars - II. Basic parameters of 107 stars",Monthly Notices of the Royal Astronomical Society,333 (1):9–26,Bibcode:2002MNRAS.333....9L,doi:10.1046/j.1365-8711.2002.05341.x.
^"The Colour of Stars",Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived fromthe original on 2013-12-03, retrieved2012-01-16.
^(in Chinese)中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005,ISBN978-986-7332-25-7.
