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It's not a mindless ramble for these folks, either. It has a half-mass diameter of 102 and linear radius of 2.7 light years. The field of view is 35 x 34 arcmin. Centaurs have four legs, and are half-man, half-horse; satyrs have two legs and are half-man, half-goat. It has a faint 14th magnitude companion 32 arc seconds away. It was discovered by William Herschel on May 22, 1784. Like several other stars in Sagittarius, Albaldah is near the ecliptic and can occasionally be occulted by the Moon and planets. It is 15-20 light years in radius and contains about 150 stars. Image: ESA/Hubble & NASA, acknowledgement: M. Novak. When this happens, the stars light drastically diminishes and ceases to excite the surrounding gas, so the nebula fades from view. The primary star has two companions; Pi Sagittarii B 0.1 arc seconds away and Pi Sagittarii C 0.4 arc seconds away. A Hubble Space Telescope photo of the planetary nebula Henize 3-1475. Image: ESA/Hubble & NASA. Whether you think Sagittarius is based on Chiron or Crotus doesn't really matter, I suppose. The Sagittarius Myth - The Correct Story Behind The Myth It belongs to the spectral type B9V. The zodiacal constellation Sagittarius represents the centaur Chiron. This is the stars modern name, which is either Babylonian or Assyrian in origin. The nebula contains an open cluster of 35 hot young stars which illuminate its gases. Sagittarius B2 is a very large molecular cloud of dust and gas approximately 390 light years from the centre of the Milky Way. It does not really have the structure of a spiral. The proper names of stars that have been officially approved by the International Astronomical Union (IAU) are Ainalrami, Albaldah, Alnasl, Arkab Posterior, Arkab Prior, Ascella, Belel, Gumala, Kaus Australis, Kaus Borealis, Kaus Media, Nunki, Pincoya, Polis, Rukbat, Sika, and Terebellum. Sagittarius contains 15 Messier objects: Messier 8 (M8, NGC 6523, Lagoon Nebula), Messier 17 (M17, NGC 6618 Omega, Swan, Horseshoe or Lobster Nebula), Messier 18 (M18, NGC 6613), Messier 20 (M20, NGC 6514, Trifid Nebula), Messier 21 (M21, NGC 6531), Messier 22 (M22, NGC 6656, Sagittarius Cluster), Messier 23 (M23, NGC 6494), Messier 24 (M24, NGC 6603, Sagittarius Star Cloud), Messier 25 (M25, IC 4725), Messier 28 (M28, NGC 6626), Messier 54 (M54, NGC 6715), Messier 55 (M55, NGC 6809), Messier 69 (M69, NGC 6637), Messier 70 (M70, NGC 6681) and Messier 75 (M75, NGC 6864). signal, the first and only radio signal ever received that indicated the possibility of extraterrestial intelligence. It has an absolute magnitude of -11 and a luminosity about 2 million times that of the Sun. Delta Sagittarii has a radius 62 times solar, a mass about five times solar, and is 1180 times more luminous than the Sun. He later included it in his catalogue. The myth behind Sagittarius actually refers to Crotus, a satyr that lived on Mount Helicon with the Muses. The cluster was discovered by John Herschel in 1830. 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.