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Hydra is the largest of the 88 modern constellations, measuring 1303 square degrees, and also the longest at over 100 degrees. Its southern end borders Libra and Centaurus and its northern end borders Cancer. [1] It was included among the 48 constellations listed by the 2nd century astronomer Ptolemy.
The following well-known stars are listed for the purpose of comparison. Antares (α Scorpii A) 680 [71] AD Fourteenth brightest star in the night sky. [72] Widely recognised as being among the largest known stars. [21] Betelgeuse (α Orionis) 640, [73] 764 +116 −62, [74] 782 ± 55 [75] AD & SEIS Tenth brightest star in the night sky. [72]
Hydra is the largest constellation, covering more than 1 ⁄ 32 of the night sky and 19 times the area of Crux, the smallest constellation. The International Astronomical Union (IAU) designates 88 constellations of stars.
This is a radio galaxy. This was the remotest object known at time of discovery of its redshift. This was the last non-quasar to hold the title of most distant object known until 1997. In 1964, quasar 3C 147 became the most distant object in the universe known. [76] [83] [97] [98] [99] LEDA 25177 (MCG+01-23-008) 1951–1960: z=0.2 (V=61000 km/s)
The name was originally Arabic: آخر النهر ʾāẖir an-nahr ('river's end'). / ˈ eɪ k ər n ɑːr / Cassiopeia: η Cassiopeiae A: Achird: Apparently first applied to η Cassiopeiae in the Skalnate Pleso Atlas of the Heavens published in 1950, but is not known prior to that. [16] / ˈ eɪ tʃ ər d / Scorpius: β 1 Scorpii Aa: Acrab
UY Scuti (BD-12°5055) is a red supergiant star, located 5,900 light-years away in the constellation Scutum.It is also a pulsating variable star, with a maximum brightness of magnitude 8.29 and a minimum of magnitude 10.56, which is too dim for naked-eye visibility.
Up until the discovery of JADES-GS-z13-0 in 2022 by the James Webb Space Telescope, GN-z11 was the oldest and most distant known galaxy yet identified in the observable universe, [7] having a spectroscopic redshift of z = 10.957, which corresponds to a proper distance of approximately 32 billion light-years (9.8 billion parsecs).
Bahu was its Sanskrit name, as part of a Hindu understanding of the constellation as a running antelope or stag. [25] In traditional Chinese astronomy, the name for Betelgeuse is 参宿四 (Shēnxiùsì, the Fourth Star of the constellation of Three Stars) [202] as the Chinese constellation 参宿 originally referred to the three stars in Orion ...