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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 3200 is a large spiral galaxy located in the constellation Hydra. Its velocity relative to the cosmic microwave background is 3,877 ± 25 km/s, which corresponds to a Hubble distance of 57.2 ± 4.0 Mpc (~187 million ly). NGC 3200 was discovered by American astronomer Edward Singleton Holden in 1882. [1]
Upsilon 1 Hydrae (υ 1 Hydrae, abbreviated Ups 1 Hya, υ 1 Hya), also named Zhang, [6] is a yellow-hued star in the constellation of Hydra. It is visible to the naked eye, having an apparent visual magnitude of 4.12. [2] Based upon an annual parallax shift of 12.36 mas as seen from Earth, [1] it is located about 264 light-years from the Sun.
NGC 5495 is a very large barred spiral galaxy located in the constellation Hydra. [1] [2] Its speed relative to the cosmic microwave background is 6,989 ± 20 km/s, which corresponds to a Hubble distance of 103.1 ± 7.2 Mpc (∼336 million ly). [3] [4] NGC 5495 was discovered by British astronomer John Herschel in 1834.
Chi 1 Hydrae (χ 1 Hydrae) is a binary star [3] in the equatorial constellation of Hydra. It originally received the Flamsteed designation of 9 Crateris before being placed in the Hydra constellation. [10] Based upon an annual parallax shift of 22.8 mas as seen from Earth, it is located about 143 light years from the Sun.
NGC 2935 is a large intermediate spiral galaxy located in the constellation Hydra. Its speed relative to the cosmic microwave background is 2,601 ± 23 km/s, which corresponds to a Hubble distance of 38.4 ± 2.7 Mpc (~125 million ly). It was discovered by German-British astronomer William Herschel on 20 March 1786. [1] [2]
Theta Hydrae, Latinized from θ Hydrae, is a binary star [8] system in the constellation Hydra.It is visible to the naked eye with an apparent visual magnitude of 3.9. [2] The star system has a high proper motion [8] with an annual parallax shift of 28.4 mas, [1] indicating a distance of about 115 light years.
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 .