Eta Persei mysteriously gained the namedMiram in the 20th Century, though no source is known.[10][11] In 2016, the IAU organized aWorking Group on Star Names (WGSN)[12] to catalog and standardize proper names for stars. The WGSN decided to attribute proper names to individual stars rather than entiremultiple systems.[13] It approved the nameMiram for the component Eta Persei A on 5 September 2017 and it is now so included in the List of IAU-approved Star Names.[8]
InChinese,天船 (Tiān Chuán), meaningCelestial Boat, refers to anasterism consisting of Eta Persei, Gamma Persei, Alpha Persei, Psi Persei, Delta Persei,48 Persei,Mu Persei andHD 27084. Consequently, theChinese name for Eta Persei itself is天船一 (Tiān Chuán yī, English:the First Star of Celestial Boat.)[14]
The primary star (η Persei A) has aspectral classification of K3Ib,[3] meaning that it is a lower luminosityred supergiant star. It has expanded to 170 times the Sun's size and currently is emitting 7,500 times itsluminosity. Its surface has aneffective temperature of4,082 K,[7] which is cooler than the Sun and gives it an orange hue, typical ofK-type stars.[15]
Multiple star catalogues list a number of companions to Eta Persei, but it is unclear if any are physically related.[16] The brightest close companion is 8th-magnitude HD 23700928″ away, with 9th-magnitude HD 174564′ away. Of the six companions listed in theWashington Double Star Catalogue,[17] only HD 237009 has a similar parallax to Eta Persei.[18]
^abcDucati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system".CDS/ADC Collection of Electronic Catalogues.2237.Bibcode:2002yCat.2237....0D.
^Hessman, F. V.; Dhillon, V. S.; Winget, D. E.; Schreiber, M. R.; Horne, K.; Marsh, T. R.; Guenther, E.; Schwope, A.; Heber, U. (2010). "On the naming convention used for multiple star systems and extrasolar planets".arXiv:1012.0707 [astro-ph.SR].
^"The Colour of Stars".Australia National Telescope Facility. 6 March 2024. Retrieved2024-05-27.
^"Eta Persei".University of Illinois. Retrieved2025-02-27.
^Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog".The Astronomical Journal.122 (6): 3466.Bibcode:2001AJ....122.3466M.doi:10.1086/323920.
