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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.
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
R Hydrae, abbreviated R Hya, [2] is a single [9] star in the equatorial constellation of Hydra, about 2.7° to the east of Gamma Hydrae. [10] It is a Mira-type variable [2] that ranges in apparent visual magnitude from 3.5 down to 10.9 over a period of 389 days.
The depictions of the constellations in Urania's Mirror are redrawings from those in Alexander Jamieson's A Celestial Atlas, published about three years earlier, and include unique attributes differing from Jamieson's sky atlas, including the new constellation of Noctua the owl, and Norma Nilotica – a measuring device for the Nile floods – held by Aquarius the water bearer.
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.
Rho Hydrae, equally written ρ Hydrae, is a binary star [9] in the equatorial constellation of Hydra. It is visible to the naked eye with an apparent visual magnitude of 4.34. [2] The distance to this system, based upon an annual parallax shift of 9.21 mas, [1] is about 354 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.
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.
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