The Bayer designation b Hydrae refers to three different stars in the constellation Hydra:

• b¹ Hydrae, (3 Crateris, HD 93397), an F-type main-sequence star
• b² Hydrae, (5 Crateris, 249 G. Hydrae, HD 94046), an A-type main-sequence star
• b³ Hydrae, (6 Crateris, 257 G. Hydrae, HD 94388), a F-type main-sequence star

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