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Hydra is the largest of the 88 modern constellations, measuring 1303 square degrees, and also the longest at over 100 degrees. Its southern end borders Libra and Centaurus and its northern end borders Cancer. [1] It was included among the 48 constellations listed by the 2nd century astronomer Ptolemy.
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]
This is the list of notable stars in the constellation Hydra, sorted by decreasing brightness. Name B F G. Var HD HIP RA Dec vis. mag. abs. mag. Dist. Sp. class Notes
Pages in category "Hydra (constellation)" The following 200 pages are in this category, out of approximately 203 total. This list may not reflect recent changes.
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.
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]
Epsilon Hydrae (ε Hydrae, abbreviated Epsilon Hya, ε Hya) is a multiple star system of a combined third magnitude in the constellation of Hydra.Based upon parallax measurements obtained during the Hipparcos mission, it is located roughly 129 light-years (40 parsecs) distant 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.