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Encyclopedia > Hydra (constellation)
Hydra
Hydra
Click for larger image
Abbreviation: Hya
Genitive: Hydrae
Symbology: the sea serpent
Right ascension: 10 h
Declination: −20°
Area: 1303 sq. deg. (1st)
Main stars: 17
Bayer/Flamsteed stars: 69
Stars with known planets: 5
Bright stars: 1
Nearby stars: 2
Brightest star: Alphard (α Hya) (1.98m)
Nearest star: HD 100623 (31.11 ly)
Messier objects: 3
Meteor showers: Alpha Hydrids
Sigma Hydrids
Bordering constellations: Antlia
Cancer
Canis Minor
Centaurus
Corvus
Crater
Leo
Libra
Lupus (corner)
Monoceros
Puppis
Pyxis
Sextans
Virgo
Visible at latitudes between +54° and −83°
Best visible at 21:00 (9 p.m.) during the month of April

Hydra (IPA: /ˈhʌɪdrə/) 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. This is a celestial map of the constellation Hydra. ... The genitive case is a grammatical case that indicates a relationship, primarily one of possession, between the noun in the genitive case and another noun. ... Loch Ness Monster (Painting) by Heikenwaelder Hugo Sea serpents are a kind of sea monster either wholly or partly serpentine. ... Equatorial Coordinates Right ascension (abbrev. ... In astronomy, declination (abbrev. ... Here is a list of the 88 modern constellations by their area in the sky, measured in square degrees. ... This article or section is not written in the formal tone expected of an encyclopedia article. ... Flamsteed designations for stars are similar to Bayer designations, except that they use numbers instead of Greek letters. ... Alphard (α Hya / α Hydrae / Alpha Hydrae) is the brightest star in the constellation Hydra. ... // Headline text HEY!! HOW ARE YOU ALL?? Its nice of you to come read this page. ... A light-year or lightyear (symbol: ly) is a unit of measurement of length, specifically the distance light travels in vacuum in one Julian year. ... The Messier objects are a set of astronomical objects catalogued by Charles Messier in his catalogue of Nebulae and Star Clusters first published in 1774. ... Leonid Meteor Shower A meteor shower, also known as a meteor storm, is a celestial event where a large number of meteors are seen within a very short period. ... Antlia (IPA: , Latin: ) is a relatively new constellation as it was only created in the 18th century, being too faint to be acknowledged by the ancient Greeks. ... Cancer (IPA: , Latin: , symbol , ) is one of the thirteen constellations of the zodiac. ... Canis Minor (IPA: , Latin: ) is one of the 88 modern constellations, and was also in Ptolemys list of 48 constellations. ... Centaurus (Latin for centaur) was one of the 48 constellations listed by Ptolemy, and counts also among the 88 modern constellations. ... Corvus (Latin for Raven/Crow) is a small southern constellation with only 11 stars visible to the naked eye (brighter than magnitude 5. ... Crater (Latin for cup) is one of the 88 modern constellations and was also one of the 48 listed by Ptolemy. ... Leo (IPA: , Latin: , symbol , ) is a constellation of the zodiac. ... Libra (IPA: , Latin: , symbol , Unicode ) is a constellation of the zodiac. ... Lupus (Latin for Wolf) is a southern constellation. ... Monoceros (IPA: , Greek: ) is a faint constellation on the winter night sky, surrounded by Orion to the east, Gemini to the north, Canis Major to the south and Hydra to the west. ... Puppis (IPA: , Latin: ) is a southern constellation. ... Categories: Astronomy stubs | Modern constellations | Constellations | Pyxis constellation | Argo Navis constellation ... For the Ancient Roman coin denomination, see sextans (coin). ... Virgo (IPA: , Latin: , symbol , ) is a constellation of the zodiac. ... Not to be confused with the NATO phonetic alphabet, which has also informally been called the “International Phonetic Alphabet”. For information on how to read IPA transcriptions of English words, see IPA chart for English. ... This article or section does not adequately cite its references or sources. ... A medieval artists rendition of Claudius Ptolemaeus Claudius Ptolemaeus (Greek: ; c. ... Hydrus (Latin for Hydra, also referred to as male Hydra or little Hydra) is a minor southern constellation. ...

Contents

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. STAR is an acronym for: Organizations Society for Telescopy, Astronomy, and Radio, a non-profit New Jersey astronomy club. ... Alphard (α Hya / α Hydrae / Alpha Hydrae) is the brightest star in the constellation Hydra. ... // Headline text HEY!! HOW ARE YOU ALL?? Its nice of you to come read this page. ...


R Hydrae is a Mira variable star that ranges in magnitude between 3.5, when it is not easily visible to the naked eye, to 10.9, when a telescope is required to see it. R Hydrae is a Mira-type variable star in the constellation Hydra. ... Mira variables, named after the star Mira (IPA [ˈmai. ... A telescope (from the Greek tele = far and skopein = to look or see; teleskopos = far-seeing) is an instrument designed for the observation of remote objects. ...


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. When two stars are so nearly in the same direction as seen from Earth that they appear to be a single star to the naked eye but may be separated by the use of telescopes, they are referred to as a double star. ... Epsilon Hydrae (ε Hya / ε Hydrae) is a Class G5, third-magnitude star in the constellation Hydra. ... Artists impression of a binary system consisting of a black hole, with an accretion disc around it, and a main sequence star. ... A second of arc or arcsecond is a unit of angular measurement which comprises one-sixtieth of an arcminute, or 1/3600 of a degree of arc or 1/1296000 ≈ 7. ...


The constellation also contains the radio source Hydra A.


Mythology

The constellation Hydra resembles a twisting serpent, 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, and Corvus, in the area of the sky known as the Sea. The bust of Zeus found at Otricoli (Sala Rotonda, Museo Pio-Clementino, Vatican) Greek mythology is the telling of stories created by the ancient Greeks, concerning their gods and heroes, the nature of the world and their own cult and ritual practices. ... Species See text. ... Lycian Apollo, early Imperial Roman copy of a fourth century Greek original (Louvre Museum) In Greek and Roman mythology, Apollo (Ancient Greek , Apóllōn; or , Apellōn), the ideal of the kouros (a beardless youth), was the archer-god of medicine and healing, light, truth, archery and also a... Crater (Latin for cup) is one of the 88 modern constellations and was also one of the 48 listed by Ptolemy. ... Corvus (Latin for Raven/Crow) is a small southern constellation with only 11 stars visible to the naked eye (brighter than magnitude 5. ... The Sea is the name early greeks, and many later astronomers, gave to an area of the sky in which many water-related, and very few land-related, constellations occur. ...


The Hydra was also considered to be the Lernaean Hydra (as defeated by Heracles for one of his Twelve Labours) by the Greeks. Its position in the sky (below the ecliptic), together with the constellation Cancer (which lies near its head) may be the origin of parts of the myth. FUCK FUCK FUCK FUCK The 16th-century German illustrator has been influenced by the Beast of Revelation in his depiction of the Hydra. ... Hercules, a Roman bronze (Louvre Museum) For other uses, see Heracles (disambiguation). ... Hercules and the Hydra by Antonio Pollaiuolo The Twelve Labours (Greek: dodekathlos) of Heracles (Latin: Hercules) are a series of archaic episodes connected by a later continuous narrative, concerning a penance carried out by Heracles, the greatest of the Greek heroes. ... The plane of the ecliptic is well seen in this picture from the 1994 lunar prospecting Clementine spacecraft. ... Cancer (IPA: , Latin: , symbol , ) is one of the thirteen constellations of the zodiac. ...


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See also

The sea serpent seen from the southern hemisphere guards the cup from Corvus, the crow. This is the list of notable stars in the constellation Hydra, sorted by decreasing brightness. ... See: Corvus is the genus name of large Passerine birds including the raven and crow species. ...

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  Results from FactBites:
 
Hydra - The Sea Serpent (532 words)
Hydra, the sea serpent, may be the longest and largest of all constellations, but its stars are very faint.
Hydra is the longest constellation in the sky and is also the largest in terms of area.
Hydra is the longest constellation in the sky (>90 degrees) and is also the largest in terms of area.
hydra (2705 words)
Hydra is another constellation having to do with snakes, for the Hydra itself or herself is a water snake, and Hydra is the feminine form of the word (Hydrus the masculine form).
Finally, and for our constellation, most importantly, she is the mother of the Lernaean Hydra, the Hydra of Lerna, who, by the time of the Greeks, had become of monstrous multi-headed monster whom Heracles (Hercules) killed.
Allen cites another definition of the sky Hydra as the winding course of the moon: "For an unknown period its winding course symbolized that of the moon; hence the latter's nodes are called the Dragon's Head and Tail" (1963 [1899], 249).
  More results at FactBites »


 

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