The constellation also contains the radio source Hydra A galaxy as well as nearby WISE 0855−0714 brown dwarf aka Proxima Hydra being the closest (sub)stellar object of the constellation. This star has three confirmed exoplanets in its orbit, one of which, GJ 357 d, is considered to be a "Super-Earth" within the circumstellar habitable zone. Hydra includes GJ 357, an M-type main sequence star located only 31 light-years from the Solar System. It has a minimum magnitude of 6.6 and a maximum magnitude of 4.2 its period is 115 days. U Hydrae is a semi-regular variable star with a deep red color, 528 light-years from Earth. Along with its notable color, V Hydrae is also home to at least two exoplanets. It varies in magnitude from a minimum of 9.0 to a maximum of 6.6. V Hydrae is an unusually vivid red variable star 20,000 light-years from Earth. It has a minimum magnitude of 10 and a period of 390 days. R Hydrae is a Mira variable star 2000 light-years from Earth it is one of the brightest Mira variables at its maximum of magnitude 3.5. Hydra is also home to several variable stars. The name of Nakshatra (Ashlesha) became the proper name of Epsilon Hydrae since 1 June 2018 by IAU. The head of the snake corresponds to the Āshleshā Nakshatra, the lunar zodiacal constellation in Indian astronomy. The other main named star in Hydra is Sigma Hydrae (σ Hydrae), which also has the name of Minchir, from the Arabic for snake's nose. Struve 1270 (Σ1270) consists of a pair of stars, magnitudes 6.4 and 7.4. N Hydrae (N Hya) is a pair of stars of magnitudes 5.8 and 5.9. The primary is a yellow star of magnitude 5.3 and the secondary is a purple star of magnitude 7.4. 54 Hydrae is a binary star 99 light-years from Earth, easily divisible in small amateur telescopes. The secondary, a binary star, appears in binoculars at magnitude 7.0 but is composed of a magnitude 7 and a magnitude 11 star it is 202 light-years from Earth. The primary is a white star of magnitude 4.8, 244 light-years from Earth. 27 Hydrae is a triple star with two components visible in binoculars and three visible in small amateur telescopes. However, there are several dimmer double stars and binary stars in Hydra. The primary is a yellow star of magnitude 3.4 and the secondary is a blue star of magnitude 6.7. Hydra has one bright binary star, Epsilon Hydrae, which is difficult to split in amateur telescopes it has a period of 1000 years and is 135 light-years from Earth. Gamma Hydrae is a yellow giant of magnitude 3.0, 132 light-years from Earth. Beta Hydrae is a blue-white star of magnitude 4.3, 365 light-years from Earth. Its traditional name means "the solitary one". It is an orange giant of magnitude 2.0, 177 light-years from Earth. Features ĭespite its size, Hydra contains only one moderately bright star, Alphard, designated Alpha Hydrae. The head of Hydra was collectively known as "Min al Az'al," meaning "belonging to the uninhabited spot" in Arabic. In Chinese astronomy, the stars that correspond to Hydra are located within the Vermilion Bird and the Azure Dragon. In Hindu Mythology the star that equivalents Hydra is Ashlesha. Mythology and equivalents in other cultures However, Hercules' nephew, Iolaus, seared the necks with a torch to prevent them from growing back and thus enabled Hercules to overcome the Hydra. According to legend, if one of the Hydra's heads was cut off, two more would grow in its place.
It is also associated with the monster Hydra, with its many heads, killed by Hercules, represented in another constellation. One myth associates it with a water snake that a crow served Apollo in a cup when it was sent to fetch water Apollo saw through the fraud, and angrily cast the crow, cup, and snake, into the sky. The shape of Hydra resembles a twisting snake, and features as such in some Greek myths. It is one of two Babylonian "serpent" constellations (the other being the origin of the Greek Serpens), a mythological hybrid of serpent, lion and bird. The Greek constellation of Hydra is an adaptation of a Babylonian constellation: the MUL.APIN includes a "serpent" constellation (Š) that loosely corresponds to Hydra. Hydra and surrounding constellations, from Urania's Mirror (1825).
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