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The Greek constellation of Hydra is an adaptation of a Babylonian constellation: the MUL.APIN includes a "serpent" constellation (MUL.DINGIR.MUŠ) that loosely corresponds to Hydra. 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. [2]
NGC 3124 is a barred spiral galaxy in the constellation Hydra. The galaxy lies about 110 million light years away from Earth based on redshift-independent methods, which means, given its apparent dimensions, that NGC 3124 is approximately 120,000 light years across. [1] Based on redshift the galaxy lies about 170 million light years away. [1]
Gamma Hydrae (γ Hya, γ Hydrae) is a binary star in the equatorial constellation of Hydra.It has an apparent visual magnitude of 3.0, [2] placing it second in brightness among the members of this generally faint constellation.
Beta Hydrae, Latinized from β Hydrae, is a double star in the equatorial constellation of Hydra. [14] Historically, Beta Hydrae was designated 28 Crateris, but the latter fell out of use when the IAU defined the permanent constellation boundaries in 1930. [15]
Chi 2 Hydrae, Latinised from χ 2 Hydrae, is a binary star system in the equatorial constellation of Hydra. Based upon an annual parallax shift of 4.6 mas as seen from Earth, it is located roughly 685 light years from the Sun. It is visible to the naked eye with a combined apparent visual magnitude of about 5.7.
Zeta Hydrae (ζ Hya, ζ Hydrae) is a solitary star in the equatorial constellation of Hydra. This is a generally faint constellation, so, at an apparent visual magnitude of +3.10, [ 2 ] this is the third-brightest member after Alphard and Gamma Hydrae .
NGC 2835 is an intermediate spiral galaxy located in the constellation Hydra. It is located at a distance of circa 35 million light years from Earth, which, given its apparent dimensions, means that NGC 2835 is about 65,000 light years across. It was discovered by Wilhelm Tempel on April 13, 1884. [3]
Xi Hydrae, Latinised from ξ Hydrae, is a solitary [9] star in the equatorial constellation of Hydra. It was also given the Flamsteed designation 19 Crateris. This magnitude 3.54 [2] star is situated 130 light-years from Earth and has a radius about 10 times that of the Sun. It is radiating 58 times as much luminosity as the Sun. [6]