High Quality Content by WIKIPEDIA articles! V Hydrae (V Hya) is a variable star in the constellation Hydra. It is considered by astronomers to be a carbon star. With a B-V colour index of +5.5 it is one of the reddest stars visible . It has period of approximately 18 years and a sub-period of approximately 530 days.In modern astronomy, a constellation is an internationally defined area of the celestial sphere. Historically, the term was also used to refer to a pattern formed by prominent stars within apparent proximity to one another, and this practice is still common today.

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