Triple star systems

triple star system in the constellation Centaurus, where one of the three stars, Proxima Centauri, being the closest star to the Earth

Fomalhaut (, ) is the brightest star in the southern constellation of Piscis Austrinus, the Southern Fish, and one of the brightest stars in the night sky. It has the Bayer designation Alpha Piscis Austrini, which is an alternative form of α Piscis Austrini, and is abbreviated Alpha PsA or α PsA. This is a class A star on the main sequence approximately from the Sun as measured by the Hipparcos astrometry satellite. Since 1943, the spectrum of this star has served as one of the stable anchor points by which other stars are classified.

Algol , designated Beta Persei (β Persei, abbreviated Beta Per, β Per), known colloquially as the Demon Star, is a bright multiple star in the constellation of Perseus and one of the first non-nova variable stars to be discovered.

star system in the southern constellation of Centaurus

Alnitak is a triple star system in the constellation of Orion. It has the designations ζ Orionis, which is Latinised to Zeta Orionis and abbreviated Zeta Ori or ζ Ori, and 50 Orionis, abbreviated 50 Ori. The system is located at a distance of several hundred parsecs from the Sun and is one of the three main stars of Orion's Belt along with Alnilam and Mintaka.

Mintaka , designation Delta Orionis (δ Orionis, abbreviated Delta Ori, δ Ori) and 34 Orionis (34 Ori), is a quintuple star system some 1,200 light-years from the Sun in the constellation of Orion. Together with Alnitak (Zeta Orionis) and Alnilam (Epsilon Orionis), the three stars form Orion's Belt, known by many names among ancient cultures. The star is located very close to the celestial equator. When Orion is near the meridian, Mintaka is the rightmost of the Belt's stars when viewed from the Northern Hemisphere facing south.

binary star system in the northern constellation of Auriga

Acrux is a multiple star system the brightest star in the southern constellation of Crux. It has the Bayer designation α Crucis, which is Latinised to Alpha Crucis and abbreviated Alpha Cru or α Cru. With a combined visual magnitude of +0.76, it is the 13th-brightest star in the night sky. It is the most southerly star of the asterism known as the Southern Cross and is the southernmost first-magnitude star, 2.3 degrees more southerly than Alpha Centauri. This system is located at a distance of from the Sun.

triple star system

multiple star system in the constellation Hercules

star in the constellation Cepheus

Megrez , also called Delta Ursae Majoris (δ Ursae Majoris, abbreviated Delta UMa, δ UMa), is a star in the northern constellation of Ursa Major. With an apparent magnitude of +3.3, it is the dimmest of the seven stars in the Big Dipper asterism. Parallax measurements yield a distance estimate of from the Sun.

star in the constellation Aquarius

binary star system in the constellation Pisces

variable star in constellation Taurus

star in constellation Fornax

triple star system in the constellation Eridanus

star

WASP-12 is a magnitude 11 yellow dwarf star located approximately 1347 light-years away in the constellation Auriga. WASP-12 has a mass and radius similar to the Sun and is known for being orbited by a planet that is extremely hot and has a retrograde orbit around WASP-12. WASP-12 forms a triple star system with two red dwarf companions. Both of them have spectral types of M3V and are only 38% and 37% as massive as the Sun, respectively.

star system

binary star in the constellation Vela

star in the constellation Centaurus

star system in the constellation Sagittarius

star in the constellation Aquila

multiple star in the constellation Cygnus

third-magnitude star in the constellation Cygnus

binary star

star in the constellation Carina

triple star system

star in the constellation Cygnus

star in the constellation Libra

star system in the constellation Cetus

star in the constellation Monoceros

triple star system in the constellation Cetus

star system in the constellation Taurus

star in the constellation Cepheus

triple star system in the constellation Cygnus

star in the constellation Aquarius

triple star system in the constellation Boötes

star system in the constellation Draco

star

multiple star

star system in constellation of Aquarius

Variable star in the constellation Scorpius

triple star system approximately 600 light-years from Earth

Kepler-444 (or KOI-3158, KIC 6278762, 2MASS J19190052+4138043, BD+41°3306) is a triple star system, estimated to be 11.2 billion years old (more than 80% of the age of the universe), approximately away from Earth in the constellation Lyra. On 27 January 2015, the Kepler spacecraft is reported to have confirmed the detection of five sub-Earth-sized rocky exoplanets orbiting the main star. The star is a K-type main sequence star. All of the planets are far too close to their star to harbour life forms.

star in the constellation Cancer

multiple star

star in the constellation Hercules

Star in the constellation Draco

star in the constellation Ophiuchus

star in the constellation Capricornus

star

binary star system in the constellation Eridanus

star system in the cnstellation Gemini

star in the constellation Serpens

star system in the constellation Centaurus

HAT-P-7 is a triple star system located about 1,088 light-years away in the constellation Cygnus. The apparent magnitude of this star is 10.5, which means it is not visible to the naked eye but can be seen with a small telescope on a clear dark night.

star in the constellation Eridanus