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Encyclopedia Britannica - Main :: HOR-I25 |
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HYDRA , in astronomy, a constellation
century B.C.) and Aratus
century B.c.), and catalogued by Ptolemy
Brahe (19) and Hevelius (31). Interesting objects are: the nebula H. I V. 27 Hydrae, a planetary nebula, gaseous and whose light
star
star
long period (425 days) variable, the range in magnitude being from 4 to 9.7; and U. Hydrae, an irregularly variable, the range in magnitude being 4.5 to 6.End of Article: HYDRA If you wish, you can link directly to this article.
<a href="http://jcsm.org/StudyCenter/Encyclopedia/HOR_I25/HYDRA.html"> HYDRA </a> |
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