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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]
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 .
TW Hydrae is a T Tauri star approximately 196 light-years away [1] in the constellation of Hydra (the Sea Serpent).TW Hydrae is about 80% of the mass of the Sun, but is only about 5-10 million years old.
27 Hydrae is a triple star system [5] system in the equatorial constellation of Hydra, [9] located 222 light years away from the Sun. [1] It is visible to the naked eye as a faint, orange-hued star with a combined apparent visual magnitude of 4.82. [2] The system is moving further from the Earth with a heliocentric radial velocity of +25.6 km/s ...
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]
Delta Hydrae, Latinized from δ Hydrae, is a double star in the equatorial constellation of Hydra. It is visible to the naked eye with an apparent visual magnitude of 4.146. [ 2 ] Based upon an annual parallax shift of 20.34 mas , it is located about 160 light years from the Sun .
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.
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.