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It spans 10 million light years and contains 157 bright galaxies, the largest of which are the ellipticals NGC 3309 and NGC 3311 and the spiral galaxy NGC 3312. See also the complete list of 244 stars brighter than magnitude 6.5 (approximate) in the constellation of Hydra. mag.
Gamma Hydrae is the second brightest star with a magnitude of 2.99. List of stars in Hydra. It has a visual magnitude of 3.25 and is 101 light years distant from Earth. It was discovered by William Herschel in 1784.The star has a radius 21 times solar and is 151 times more luminous than the Sun. It is located approximately 177 light years from Earth. Despite its symmetric appearance, the region of the central 1000 light-years of the galaxy shows an unusually high level of complexity, containing both a double nucleus and a double circumnuclear starburst ring. The nebula was discovered by the German-born British astronomer William Herschel on February 7, 1785.NGC 5078 is a spiral galaxy in Hydra.U Hydrae is another carbon star in Hydra constellation. It is the main member of a small galactic group including NGC 5253 and about 9 dwarf galaxies. Its apparent magnitude ranges from 7.0 to 11.5 over a period of about 18 years, with a sub-period of 530 days. Its traditional name means "the solitary one". It is a red giant with an apparent magnitude that slowly changes from 3.5 to 10.9 over a period of 389 days. It is a chemically peculiar class B star with a strong magnetic field.Zeta Hydrae is an evolved giant in the luminosity class between a giant and bright giant.
Being so large, Hydra borders quite a number of other constellations, including Antlia, Cancer, Canis Minor, Centaurus, Corvus… The star clusters in the nuclear starburst rings are mostly young stars between 5 and 10 million years old. While the two galaxies look as if they are in the midst of a collision, this is in fact a trick of perspective: the two are in chance alignment from our vantage point. The nature of the double nucleus is uncertain but the origin of the off centred nucleus could be a remnant core of a small galaxy that merged with Messier 83 in the past.
The stars have an orbital period of 15 years and are separated by 0.2 arc seconds. It is about 177 light years away.
There are two meteor showers associated with the constellation: the Alpha Hydrids and the Sigma Hydrids. The star is approximately 179 light years distant. It is a known X-ray source.Open cluster Messier 48 (NGC 2548)The Hydra Cluster is 190.1 million light years distant from the solar system.Gamma Hydrae is the second brightest star in Hydra. However, in some respects, Messier 83 is quite similar to our own galaxy.