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Antares
Antares, α Scorpii also called, is the brightest star in the constellation Scorpio. It is approximately 600 light years from Earth. The name comes from the Greek and means something like “Against Mars (Gegenares) ". The god Ares was the Romans Mars called, and Antares has both a similar color and similar brightness as Mars, which is why both are easily confused, especially since they are always near the ecliptic are. Other names are Qalbu l-ʿ Aqrab (Arabic قلب العقرب, Heart of the Scorpion.

Brightness

With an apparent magnitude of 1.09 like it is the 16th brightest star in the sky. Its absolute magnitude is -5.3 mag and so is the star in the visible region is about 10,000 times brighter than the sun. The surface is relatively cool, the temperature is only 3,400 Kelvin, which is why Antares has an orange-red color and very much invisible to the eye infrared emitting. Taking this into consideration, the Antares has about 65,000 times the luminosity of the sun. Its spectral class M1, the luminosity class Iab.

Like most red super giant Antares is a semi-regular variable star of type SRc. The periods are 300 and 1700 days

Size

From the relatively low temperature and strong brightness can conclude that Antares has enormous proportions. Its diameter is about 1000 million km. He would put in place of the sun, far beyond the orbit of Mars protrude. Antares counts as Betelgeuse to the red supergiant. In its current development phase it loses its outer gas layers, forming a planetary nebula which is visible due to a hot companion star.

Antares has enough mass to after reaching the helium burning to generate an iron core and a supernova to explode before he has repelled all gas layers.

α Scorpii B

Antares is an unobtrusive companion with a double star system. At an angular distance of 2.6 "is the position angle of 273 °, a blue-white star (spectral type B3 V) the apparent brightness 5.5 may thus α Sco B has 1/370tel the brightness of Antares, but still has the 170th - times brighter than the Sun ., the orbital period is 878 years at a distance of 550 AU . To see this companion, a telescope of 10 inches aperture lens is needed.

Other

Antares is a star of Moon (very rare) are covered planet. The last eclipse of Antares by a planet took place on 17 September 525 BC by Venus; the next one is on 17 November 2400 made again by Venus. Antares is a member of the Gould Belt. In Mesopotamian mythology Antares received in the first millennium BC, the name of the Sumerian goddess Lisin.