Iota Trianguli, Latinized from ι Trianguli, is a quadruple

star A star is a luminous spheroid of plasma (physics), plasma held together by Self-gravitation, self-gravity. The List of nearest stars and brown dwarfs, nearest star to Earth is the Sun. Many other stars are visible to the naked eye at night sk ...

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 Irradiance, brightness of a star, astronomical object or other celestial objects like artificial satellites. Its value depends on its intrinsic luminosity, its distance, and any extinction (astronomy), ...

of 4.95 and are approximately 290

light years A light-year, alternatively spelled light year (ly or lyr), is a unit of length used to express astronomical distances and is equal to exactly , which is approximately 9.46 trillion km or 5.88 trillion mi. As defined by the International Astro ...

from

Earth Earth is the third planet from the Sun and the only astronomical object known to Planetary habitability, harbor life. This is enabled by Earth being an ocean world, the only one in the Solar System sustaining liquid surface water. Almost all ...

Both components of ι Trianguli are

spectroscopic binaries A binary star or binary star system is a Star system, system of two stars that are gravity, 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 ...

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 extends the Bayer designation format, with an identifying label (as described below) preceding the Latin genitive of the name of the constellation in whic ...

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 luminosity. ...

. Together with

10 Trianguli 10 Trianguli (HD 14252; HR 675; 1 H. Trianguli Minus), or simply 10 Tri is a solitary star located in the northern constellation Triangulum. It is faintly visible to the naked eye as a white-hued point of light with an apparent magnitude ...

and

12 Trianguli 12 Trianguli is a solitary star located in the northern constellation Triangulum, with an apparent magnitude of 5.37, making it faintly visible to the naked eye under ideal conditions. The star is situated 160 light years away but is ap ...

, it forms part of the obsolete Triangulum Minus.

References

External links

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