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Iota Trianguli, Latinized from ι Trianguli, is a quadruple star system in constellation of
Triangulum Triangulum is a small constellation in the northern sky. Its name is Latin for "triangle", derived from its three brightest stars, which form a long and narrow triangle. Known to the ancient Babylonians and Greeks, Triangulum was one of the 48 ...
. The pair have a combined
apparent magnitude Apparent magnitude () is a measure of the brightness of a star or other astronomical object observed from Earth. An object's apparent magnitude depends on its intrinsic luminosity, its distance from Earth, and any extinction of the object's ...
of 4.95 and are approximately 290
light years A light-year, alternatively spelled light year, is a large unit of length used to express astronomical distances and is equivalent to about 9.46 trillion kilometers (), or 5.88 trillion miles ().One trillion here is taken to be 1012 ...
from
Earth Earth is the third planet from the Sun and the only astronomical object known to harbor life. While large volumes of water can be found throughout the Solar System, only Earth sustains liquid surface water. About 71% of Earth's surfa ...
. Both components of ι Trianguli are
spectroscopic binaries A binary star is a system of two stars that are gravitationally bound to and in orbit around each other. Binary stars in the night sky that are seen as a single object to the naked eye are often resolved using a telescope as separate stars, in w ...
and the brighter pair is variable. It has been given the
variable star designation In astronomy, a variable star designation is a unique identifier given to variable stars. It uses a variation on the Bayer designation format, with an identifying label (as described below) preceding the Latin genitive of the name of the conste ...
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 An RS Canum Venaticorum variable is a type of variable star. The variable type consists of close binary stars having active chromospheres which can cause large stellar spots. These spots are believed to cause variations in their observed luminosi ...
. Together with 10 Trianguli and 12 Trianguli, it forms part of the obsolete Triangulum Minus.


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* {{DEFAULTSORT:Iota Trianguli F-type main-sequence stars Rotating ellipsoidal variables RS Canum Venaticorum variables Trianguli, TZ Spectroscopic binaries 4 Trianguli, Iota Triangulum (constellation) Durchmusterung objects Trianguli, 06 013480 010280 0642 G-type giants