Messier Objects in Hydra: M48, M68, M83
- Constellation index
- More on constellation Hydra (Christine Kronberg)
- More on Hydra (Chris Dolan)
- Shane Horvatin's Hydra page
- Constellation Hydra from the Peoria Astronomical Society
- Digital images - Constellations Sextans and Hydra page (T. Credner/S. Kohle) [ unframed version] (No Messier Objects visible)
- Jan Wisniewski's Constellation Hydra page
- Akari Fujii's Constellation of Hydra (Hydra along southern horizon); parts: Hydra Head with Sextans, Hydra west, Hydra east
- Constellation Hydra page (Hawaiian Astronomical Society)
- Hydra Constellation and Mythology pages from Judy and Volker's Star Lore page
- Hydra Constellation Chart from Johny Walker's Your Sky (Western/Preceding part)
- Hydra Constellation Chart from Johny Walker's Your Sky (Eastern/Following part)
- Eckhard Slawik's Hydra photo (NOIRlab) - annoted
- Hydra map from IAU and Sky & Telescope (NOIRlab)
- Hydra from NOIRlab's 88 Constellations Project - Flashcard
Hartmut Frommert
Christine Kronberg
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