
Hydra is the largest of the 88 modern constellations, and was also one of the 48 constellations listed by Ptolemy. It should not be confused with Hydrus. ==Notable features== Hydra is the largest modern constellation, at 1303 square degrees. Despite its size, Hydra contains only one reasonably bright star, Alphard (α Hya, 30 Hya), which is of apparent magnitude 1.98. R Hydrae is a Mira variable star that ranges in magnitude between 3.5, when it is easily visible to the naked eye, to 10.9, when a telescope is required to see it. There are several double stars of interest in Hydra. Epsilon Hydrae (ε Hya) is a binary star with components of magnitudes 3.3 and 6.8, separated by 2.7 arcseconds. N Hydrae (N Hya) is a pair of stars of magnitudes 5.8 and 5.9. Struve 1270 (Σ1270) consists of a pair of stars, magnitudes 6.4 and 7.4. The constellation also contains the radio source Hydra A. ==Stars== :Stars with proper names: :* Alphard [''Alfard, Kalbelaphard''] or ''Cor Hydrae'' (30/α Hya) 1.99 :*: < قلب الفرد ''qalb al-fard'' Heart of the solitary one :* Minhar al Shija [''Al Minliar al Shuja, Minchir''] (5/σ Hya) 4.45 :*: < منخر الشجاع minxar aš-šugac: Nostril of the snake (lit. brave) :* ''Ukdah'' (31/τ1 Hya) 4.59 or (32/τ2 Hya) 4.54 :*: < عقدة ''cuqdah'' Knot :Stars with Bayer designation: :*Beta Hydrae 4.29; Gamma Hydrae 2.99; Delta Hydrae 4.14; Epsilon Hydrae 3.38; Zeta Hydrae 3.11; Theta Hydrae 3.89; Eta Hydrae 4.30; Iota Hydrae 3.90; Kappa Hydrae 5.07; Lambda HydraeHya]] 3.61; Mu Hydrae 3.83; Nu Hydrae 3.11; Xi Hydrae 3.54; Omicron Hydrae 4.70; Pi Hydrae 3.25; Rho Hydrae 4.35; Upsilon1 Hydrae 4.11; Upsilon2 Hydrae 4.60; Chi1 Hydrae 4.92; Chi2 Hydrae 5.69; Phi Hydrae 4.91; Phi1 Hydrae 7.81; Phi2 Hydrae 6.01; Psi Hydrae 4.94; Omega Hydrae 4.99; a Hydrae 4.98; b1 Hydrae 5.44; b3 Hydrae 5.23; k Hydrae 4.78; l Hydrae 4.97; m Hydrae 5.15; A Hydrae 5.56; C Hydrae 3.91; D Hydrae 4.32; E Hydrae 4.42; F Hydrae 4.63; G Hydrae 4.72; I Hydrae 4.76; P Hydrae 4.80 :Stars with Flamsteed designation: :*1 Hydrae 5.61; 2 Hydrae 5.60; 3 Hydrae 5.72; 9 Hydrae 4.87; 10 Hydrae 6.13; 14 Hydrae 5.30; 15 Hydrae 5.55; 17 Hydrae 6.07; 17 Hydrae 6.67; 19 Hydrae 5.60; 20 Hydrae 5.47; 21 Hydrae 6.10; 23 Hydrae 5.24; 24 Hydrae 5.49; 25 Hydrae 7.35; 26 Hydrae 4.77; 28 Hydrae 5.60; 29 Hydrae 6.53; 34 Hydrae 6.40; 37 Hydrae 6.31; 44 Hydrae 5.08; 47 Hydrae 5.20; 48 Hydrae 5.77; 50 Hydrae 5.07; 55 Hydrae 5.61; 56 Hydrae 5.23; 57 Hydrae 5.76; 59 Hydrae 5.65; 60 Hydrae 5.83 :Other notable stars: :* HD 74156 7.62 – has 2 planets :* HD 82943 6.54 – has 2 planets ==Mythology== The constellation Hydra resembles a twisting snake, and features as such in some Greek myths. In Greek mythology, a crow serves Apollo. It is sent to fetch water, but it rests lazily on the journey, and after finally obtaining the water in a cup, takes back a water snake as well, as an excuse. According to the myth, Apollo saw through the fraud, and angrily cast the crow, cup, and snake, into the sky. The origin of this story is likely to be the juxtaposition of this constellation with those of Crater (constellation), and Corvus (constellation), in the area of the sky known as the Sea (astronomy). The Hydra was also considered to be the Lernaean Hydra (as defeated by Heracles for one of his The Twelve Labours) by the Greeks. Its position in the sky (below the ecliptic), together with the constellation Cancer (constellation) (which lays near its head) may be the origin of parts of the myth. ==See also== * Felis (constellation) == External links == * [http://www.allthesky.com/constellations/hydra/ The Deep Photographic Guide to the Constellations: Hydra] Hydra constellation Constellations listed by Ptolemy th:กลุ่มดาวงูไฮดรา
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Words begining with Hydra_(constellation):
Hydra_(constellation)
Hydra (constellation)
Hydra is the largest of the 88 modern constellations, and was also one of the 48 constellations listed by Ptolemy. It should not be confused with Hydrus. ==Notable features== Hydra is the largest modern constellation, at 1303 square degrees. Despite its size, Hydra contains only one reasonably bright star, Alphard (α Hya, 30 Hya), which is of apparent magnitude 1.98. R Hydrae is a Mira variable star that ranges in magnitude between 3.5, when it is easily visible to the naked eye, to 10.9, when a telescope is required to see it. There are several double stars of interest in Hydra. Epsilon Hydrae (ε Hya) is a binary star with components of magnitudes 3.3 and 6.8, separated by 2.7 arcseconds. N Hydrae (N Hya) is a pair of stars of magnitudes 5.8 and 5.9. Struve 1270 (Σ1270) consists of a pair of stars, magnitudes 6.4 and 7.4. The constellation also contains the radio source Hydra A. ==Stars== :Stars with proper names: :* Alphard [''Alfard, Kalbelaphard''] or ''Cor Hydrae'' (30/α Hya) 1.99 :*: < قلب الفرد ''qalb al-fard'' Heart of the solitary one :* Minhar al Shija [''Al Minliar al Shuja, Minchir''] (5/σ Hya) 4.45 :*: < منخر الشجاع minxar aš-šugac: Nostril of the snake (lit. brave) :* ''Ukdah'' (31/τ1 Hya) 4.59 or (32/τ2 Hya) 4.54 :*: < عقدة ''cuqdah'' Knot :Stars with Bayer designation: :*Beta Hydrae 4.29; Gamma Hydrae 2.99; Delta Hydrae 4.14; Epsilon Hydrae 3.38; Zeta Hydrae 3.11; Theta Hydrae 3.89; Eta Hydrae 4.30; Iota Hydrae 3.90; Kappa Hydrae 5.07; Lambda HydraeHya]] 3.61; Mu Hydrae 3.83; Nu Hydrae 3.11; Xi Hydrae 3.54; Omicron Hydrae 4.70; Pi Hydrae 3.25; Rho Hydrae 4.35; Upsilon1 Hydrae 4.11; Upsilon2 Hydrae 4.60; Chi1 Hydrae 4.92; Chi2 Hydrae 5.69; Phi Hydrae 4.91; Phi1 Hydrae 7.81; Phi2 Hydrae 6.01; Psi Hydrae 4.94; Omega Hydrae 4.99; a Hydrae 4.98; b1 Hydrae 5.44; b3 Hydrae 5.23; k Hydrae 4.78; l Hydrae 4.97; m Hydrae 5.15; A Hydrae 5.56; C Hydrae 3.91; D Hydrae 4.32; E Hydrae 4.42; F Hydrae 4.63; G Hydrae 4.72; I Hydrae 4.76; P Hydrae 4.80 :Stars with Flamsteed designation: :*1 Hydrae 5.61; 2 Hydrae 5.60; 3 Hydrae 5.72; 9 Hydrae 4.87; 10 Hydrae 6.13; 14 Hydrae 5.30; 15 Hydrae 5.55; 17 Hydrae 6.07; 17 Hydrae 6.67; 19 Hydrae 5.60; 20 Hydrae 5.47; 21 Hydrae 6.10; 23 Hydrae 5.24; 24 Hydrae 5.49; 25 Hydrae 7.35; 26 Hydrae 4.77; 28 Hydrae 5.60; 29 Hydrae 6.53; 34 Hydrae 6.40; 37 Hydrae 6.31; 44 Hydrae 5.08; 47 Hydrae 5.20; 48 Hydrae 5.77; 50 Hydrae 5.07; 55 Hydrae 5.61; 56 Hydrae 5.23; 57 Hydrae 5.76; 59 Hydrae 5.65; 60 Hydrae 5.83 :Other notable stars: :* HD 74156 7.62 – has 2 planets :* HD 82943 6.54 – has 2 planets ==Mythology== The constellation Hydra resembles a twisting snake, and features as such in some Greek myths. In Greek mythology, a crow serves Apollo. It is sent to fetch water, but it rests lazily on the journey, and after finally obtaining the water in a cup, takes back a water snake as well, as an excuse. According to the myth, Apollo saw through the fraud, and angrily cast the crow, cup, and snake, into the sky. The origin of this story is likely to be the juxtaposition of this constellation with those of Crater (constellation), and Corvus (constellation), in the area of the sky known as the Sea (astronomy). The Hydra was also considered to be the Lernaean Hydra (as defeated by Heracles for one of his The Twelve Labours) by the Greeks. Its position in the sky (below the ecliptic), together with the constellation Cancer (constellation) (which lays near its head) may be the origin of parts of the myth. ==See also== * Felis (constellation) == External links == * [http://www.allthesky.com/constellations/hydra/ The Deep Photographic Guide to the Constellations: Hydra] Hydra constellation Constellations listed by Ptolemy th:กลุ่มดาวงูไฮดรา
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H
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Hydra_(constellation)
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