As one of the deep southern constellations, it remains below the horizon at latitudes north of the 30th parallel in the Northern Hemisphere, and is circumpolar at latitudes south of the 50th parallel in the Southern Hemisphere. , HD 20003 is a star of magnitude 8.37. , Three other systems have been found to have planets, most notably the Sun-like star HD 10180, which has seven planets, plus possibly an additional two for a total of nine—as of 2012 more than any other system to date, including the Solar System. Hydra, the water snake, is the largest constellation in the sky.  Of spectral type F0IV, it is beginning to cool and enlarge as it uses up its supply of hydrogen. So, when you talk about the constellation, it drives attention of everyone. Hydrus / ˈ h aɪ d r ə s / is a small constellation in the deep southern sky.It was one of twelve constellations created by Petrus Plancius from the observations of Pieter Dirkszoon Keyser and Frederick de Houtman and it first appeared on a 35-cm (14 in) diameter celestial globe published in late 1597 (or early 1598) in Amsterdam by Plancius and Jodocus Hondius.  One of the brightest dwarf novae in the sky, it has a baseline magnitude of 14.4 and can brighten to magnitude 8.4 during peak activity. The French explorer and astronomer Nicolas Louis de Lacaille charted the brighter stars and gave their Bayer designations in 1756. The object at the coordinate Dreyer observed is no longer there, and is now a mystery. There are various other neighboring constellations of Hydrus. Hydrus resembles a rearing snake, with its head erect and body twisted into a sinuous …  A line drawn between the long axis of the Southern Cross to Beta Hydri and then extended 4.5 times will mark a point due south. Of these, he used the designations Eta, Pi and Tau twice each, for three sets of two stars close together, and omitted Omicron and Xi.  Lacaille charted and designated 20 stars with the Bayer designations Alpha through to Tau in 1756. The brightest star of this constellation is Beta Hydri which has the visual magnitude of about 2.80. Hydrus was one of the twelve constellations established by the Dutch astronomer Petrus Plancius from the observations of the southern sky by the Dutch explorers Pieter Dirkszoon Keyser and Frederick de Houtman, who had sailed on the first Dutch trading expedition, known as the Eerste Schipvaart, to the East Indies. To watch it with the best visibility, you can locate it in the sky during November at 9 p.m. The distance of this star is about 24.38 lights years away from earth.  The spectrum of this star matches a stellar classification of G2 IV, with the luminosity class of 'IV' indicating this is a subgiant star. In the equatorial coordinate system, the right ascension coordinates of these borders lie between 00h 06.1m and 04h 35.1m , while the declination coordinates are between −57.85° and −82.06°. The declination of this constellation is -57 degrees to-82 degrees approx. It was one of twelve constellations created by Petrus Plancius from the observations of Pieter Dirkszoon Keyser and Frederick de Houtman and it first appeared on a 35-cm (14 in) diameter celestial globe published in late 1597 (or early 1598) in Amsterdam by Plancius and Jodocus Hondius. It was very likely to have been a faint comet. This constellation symbolizes water snake. Few important keys about Hydrus constellation are given below: The bordering stars of this constellation are as follows: So if you want to see Hydrus, don’t miss it out this November.
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