R Hydrae

R Hydrae is a Mira-type variable star in the constellation Hydra.

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The magnitude of R Hydrae varies over a period of 389 days, between 3.21 and 11.00. The period of R Hydrae changes slowly.

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At maximum brightness the star can be seen with the naked eye, while at minimum a telescope of at least 5 cm is needed.

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R Hydrae is approximately 2000 light years from Earth and is of spectral class M7.

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• Right ascension: 13h29m42.80s
• Declination: −23?16'53.0"

Constellation: A constellation is a group of stars visibly related to each other in a particular configuration. In three-dimensional space, most of the stars we see have little relation to one another, but can appear to be grouped on the celestial sphere of the night sky. Humans excel at finding patterns and throu...

Hydra: Hydra has a number of meanings....

Magnitude: In science, magnitude refers to the numerical size of something: see orders of magnitude.In mathematics, the magnitude of an object is a non-negative real number, which in simple terms is its length.In physics, the magnitude of a vector is a scalar in the physical sense, i.e. a physical quantity ind...