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Upsilon1 Hydrae, 39 Hydrae

Proper NameZhang
Bayer DesignationUpsilon1 Hydrae
Flamsteed Number39 Hydrae
HR (BSC)3903
Right Ascension9h 51m 29s
Declination-14° 50' 48"
Distance264 light years
81 parsecs
MagnitudeApparent: +4.1
Absolute: +0.9
Spectral ClassG6.5IIIa yellow giant
Optimum VisibilityFebruary / March
NotesZhang is a yellow giant star some 17 times the Sun's diameter, known to have a brown dwarf, Upsilon1 Hydrae b, in orbit around it. The name Zhang derives from the name of this star in Chinese tradition, in full Zhāng Xiù Yī, the 'first (star) of the Extended Net' (the Extended Net being a Chinese asterism within Hydra).


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