czsky/en/star/R_Hydrae.md

name	constellation	created_by	created_date	updated_by	updated_date
R Hydrae	Hya	8mag	2022-01-21 17:00:00	skybber	2022-02-06 11:44:10.602134

a red giant, one of the most famous Mira Ceti type variable stars. It varies in apparent brightness from 3.5mag to 10.9mag over a period of 389.6 days, first noticed by astronomers in the 17th century. However, the period has probably shortened by about 100 days since then. It is about 700 light-years away and at its greatest peak exceeds the luminosity of 7,000 Suns.