Iota Trianguli

Iota Trianguli, also named Triminus, is a quadruple star system in constellation of Triangulum. The pair have a combined apparent magnitude of 4.95 and are approximately 290 light-years from Earth.
File:IotaTriLightCurve.png|thumb|left|A light curve for Iota Trianguli, plotted from Hipparcos data
Both components of ι Trianguli are spectroscopic binaries and the brighter pair is variable. It was discovered to be a variable star in 1980, by Douglas S. Hall et al. It has been given the variable [star designation] TZ Trianguli. The variations are due to the ellipsoidal shape of the stars as they rotate, and also it is classified as an RS [Canum Venaticorum variable].

Nomenclature

Iota Trianguli, Latinized from ι Trianguli, is the star's Bayer designation; it is also known by the Flamsteed designation 6 Trianguli. Together with 10 Trianguli and 12 Trianguli, it formed part of the obsolete constellation Triangulum Minus.
The Latin name "Triminus" is composed of the IAU abbreviation of "Tri" for Triangulum and "Minus" for Triangulum Minus, or the lesser triangle made by Johannes Hevelius. The IAU [Working Group on Star Names] approved the name Triminus for Iota Trianguli Aa on 25 August 2025 and it is now so entered in the IAU Catalog of Star Names.