It is located between Zeta and Sigma Sagittarii. It is a suspected binary star, even though a companion has never been confirmed. Tau Sagittarii is well known to astronomers as the closest visible star to the origin of the Wow! Jerry R. Ehman on August 15, at the Ohio State University. It lasted for full 72 seconds, but has never been detected since.
Eta Sagittarii is another multiple star system in Sagittarius. It is approximately light years distant. Before being assigned to Sagittarius, the star system was known as Beta Telescopii. Around the year , the system will have moved from Sagittarius to the Corona Australis constellation. The primary component in the Eta Sagittarii system is a type M3. The brightest companion star is an F class dwarf with an apparent magnitude of 7.
The companion can be found 3. Another companion star is only 13th magnitude and can be seen 33 arc seconds away from the primary, while the faintest star in the system is 10th magnitude and is separated from the brightest star by 93 arc seconds. The Pistol Star is one of the most luminous stars known. It is a blue variable star that is about four million times as luminous as our Sun and times as massive. It has about a third of the luminosity of the Eta Carinae binary system in the constellation Carina and is believed to radiate as much energy in 20 seconds as the Sun does in a year.
Pistol Star and Nebula false colour composite image , photo: Don F. Located in the Galactic centre region, the Pistol Star lies approximately 25, light years from our solar system. Without the interstellar dust in the way, despite its distance it would be a fourth magnitude star, visible to the naked eye. The star was named after the shape of the nebula it illuminates, the Pistol Nebula.
Peony Star, or WR ka, is one of the most luminous stars known in our galaxy. Named after the nebula that surrounds it — the Peony Nebula — the Peony Star is a Wolf-Rayet star with an absolute magnitude of It lies at a distance of 26, light years from Earth. It must be observed in infrared wavelengths. Peony Star has an estimated mass of about solar masses and a radius 92 times solar. It is less that 3 million years old, but it has shed a lot of its initial mass and is expected to end its life in a supernova or hypernova explosion in the next few million years.
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VX Sagittarii , currently as of one of the five largest known stars in the Milky Way, is an evolved red supergiant or hypergiant M4eIa — M10eIa with a radius between 1, and 1, times that of the Sun and a mass 12 times solar. The star is classified as a semiregular variable of the SRc type.
It has an apparent magnitude that varies from 6. VX Sagittarii lies at an approximate distance of 5, light years from Earth. Its final helium flash is expected to occur in the next few decades. The bright star in the centre of this image is not the star of this show. At the bottom centre is a rather unremarkable smudge of red which is in fact a rare and valuable object. The object is actually a small white dwarf star undergoing a helium flash — one of only a handful of examples of such an event ever witnessed by astronomers. Normally, the white dwarf stage is the last in the life cycle of a low-mass star.
In some cases, however, the star reignites in a helium flash and expands to return to a red giant state, ejecting huge amounts of gas and dust in the process, before once again shrinking to become a white dwarf. The white dwarf emits sufficient ultraviolet radiation to illuminate the gas it has expelled, which can just be seen in this image as the ring of red material. Image: ESO. The star was discovered in February by Yukio Sakurai, an amateur astronomer. At the time, it was believed to be a magnitude By , the star became invisible in optical wavelengths as a result of being obscured by a very thick shell of dust.
KW Sagittarii is one of the largest known stars. It is a red supergiant located about 10, light years from Earth, with an apparent magnitude varying between 8. Mu Sagittarii is a multiple star system in Sagittarius, with individual components designated Polis A through Polis E. Polis is about 3, light years distant from Earth. The primary component in the star system is a class B giant 23 times as massive as the Sun, and , times more luminous.
It is an eclipsing binary star, with a B8 supergiant star for a primary component and a B2 type giant as the companion star.
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The apparent magnitude of Polis A ranges from 3. Rho Sagittarii is a binary star with a subgiant belonging to the spectral class F0 as the primary component and a K0 type giant as the companion, separated by 0. The subgiant has an apparent magnitude of 3. The companion star has an apparent magnitude of 5. Upsilon Sagittarii is a spectroscopic binary star.
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It is one of only four star systems known to be hydrogen-deficient, which makes it difficult to classify U Sgr. Most likely, the primary component is an A type supergiant. It is classified as an irregular variable star, with an apparent magnitude varying from 4.
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The companion star is more massive than the primary, but so faint that optical telescopes cannot detect it. The Upsilon Sagittarii system is about 1, light years distant and has an orbital period of Ross is a red dwarf only 9. It is one of the closest stars to the Sun and the nearest star in Sagittarius constellation. It is located only 5.
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The star is a relatively young one, with an estimated age of less than a billion years. It is a known X-ray source. It will make its closest approach to the Sun in about , years, when it comes within 6. Ross was originally catalogued by the American astronomer and physicist Frank Elmore Ross in It is classified as a UV Ceti-type flare star, one undergoing sudden dramatic increases in brightness for a few minutes. Flare stars are typically dim red dwarfs or less massive brown dwarfs.
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V Sagittarii is the fourth known microquasar, discovered after four of the fastest X-ray intensity changes ever seen from a star. First detected in , V Sgr is a variable X-ray binary system once considered to be the closest black hole to Earth, at a distance of about 1, light years. It is now believed to be located at least 15 times farther away. The system is notable for being the source of one of the most rapid superluminal faster than light jets in our galaxy. The Terebellum is a quadrilateral formed by four fourth magnitude stars in Sagittarius, all within two degrees of each other: Omega Sagittarii, 59 Sagittarii, 60 Sagittarii and 62 Sagittarii.
Omega Sagittarii is a G-type subgiant marking the northeast corner of the Terebellum, about 78 light years distant from Earth. The star is classified as an irregular variable.
The stars are located at different distances from the solar system and are not gravitationally bound. Sagittarius A is a radio source located at the centre of the Milky Way, in the direction of the Sagittarius constellation. The supernova remnant Sagittarius A East is about 25 light years wide and appears to have originated in an explosion that occurred between 35, and , years ago.
Because it has an imposing size and energy, Sagittarius A East is believed to be a remnant of the explosion of a star that came close to the central black hole and was gravitationally compressed. The spiral structure Sagittarius A West appears like a three-arm spiral and is sometimes called the Minispiral. It does not really have the structure of a spiral.