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(covers information from several alternate timelines)
Gamma Hydra was the primary of its star system. The star was located near to the Federation-Klingon border and the Romulan Neutral Zone, in the Gamma Hydra sector. (TOS: "The Deadly Years"; Star Trek II: The Wrath of Khan)
In the mid-23rd century, a Federation experimental colony was founded on Gamma Hydra IV. In 2267, a rogue comet intersected with the orbital path of Gamma Hydra IV. As the trail of the comet passed near the planet, the planet was irradiated by with residue left behind by the comet. This radiation affected the colony, resulting in a total loss of life. (TOS: "The Deadly Years")
In 2366, in an alternate timeline, during the Federation-Klingon War, the location of Gamma Hydra was labeled on a tactical situation monitor in the ready room aboard the USS Enterprise-D. (TNG: "Yesterday's Enterprise", okudagram)