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| Sagittarius | |
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| Abbreviation | Sgr |
| Genitive | Sagitarii |
| Meaning in English | the Archer |
| Right ascension | 19 h |
| Declination | −25° |
| Visible to latitude | Between 55° and −90° |
| Best visible | August |
| Area - Total | Ranked 15th 867 sq. deg. |
| Number of stars with apparent magnitude < 3 | 5 |
| Brightest star - Apparent magnitude | Kaus Australis (ε Oph) 1.9 |
| Meteor showers | none |
| Bordering constellations |
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Sagittarius (the archer) is a constellation of the zodiac, commonly depicted as a centaur drawing a bow. Sagittarius lies between Scorpius to the west and Capricornus to the east. Its brighter stars form an easily recognizable teapot shape.
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The constellation is easily recognizable through an asterism called the Teapot. The stars Kaus Media (δ), Kaus Australis (ε), Ascella (ζ), and φ Sagitarii form the body of the pot; Kaus Borealis (λ) is the point of the lid; Alnasl (γ) is the tip of the spout; and Nunki (σ) and τ Sagitarii the handle. [1] [2]
The α star, Rukbat, is nowhere near the brightest star of the constellation, having a magnitude of only 4.0.
The Milky Way is at its densest as it passes through Sagittarius, as this is where the galactic centre lies. Consequently, Sagittarius contains many star clusters and nebulae. One of the brightest of the star clusters is M55, about 7.5° west of δ Sgr.
The constellation contains nebulae such as the Lagoon Nebula (M8), near λ Sagitarii, beautiful in telescopes; the Omega, Swan, or Horseshoe Nebula (M17), near the border with Scutum; and the Trifid Nebula (M20), a large nebula containing some very young, hot stars.
The complex radio source Sagittarius A associated with the galactic centre is also here. Astronomers believe that Sagittarius A may contain a supermassive black hole.
In Greek mythology, Sagittarius was the centaur Chiron, aiming his bow at the Scorpion.
In some cosmologies, Sagittarius is associated with the classical element Fire, and thus called a Fire Sign (with Aries and Leo). Its polar opposite is Gemini.
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