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Head of Hydrus

Alpha Hydri

Proper NameHead of Hydrus
Bayer DesignationAlpha Hydri
Flamsteed NumberNone
HR (BSC)591
Right Ascension1h 58m 46s
Declination-61° 34' 11"
Distance72 light years
22 parsecs
MagnitudeApparent: +2.9
Absolute: +1.1
Spectral ClassF0III-IVn bright yellow giant
Optimum VisibilityOctober / November (Usually visible from southern latitudes)
NotesA pale yellow F-type star on the boundary between the subgiant and giant classifications, the Head of Hydrus is desigated Alpha Hydri (although it is in fact marginally fainter than the Beta star of its constellation). The Head of Hydrus is a rather larger and hotter star than the Sun, being some 2.6 times the Sun's diameter and mearly thirty times as luminous.


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