What date was the constellation "hydra" named?

Can't find this on the internet anywhere!!! All help is appreciated.What date was the constellation "hydra" named?It already had that name in Ptolemy's original list (almost 2000 years ago). Hydra is a Greek name (峤澪聪佄? so it is not a constellation that was renamed later with a Latin name. It may refer to the Hydra that was killed by Heracles (Greek version of the name of Hercules) in his 12 labors.



Difficult to say exactly when it received its name.What date was the constellation "hydra" named?Tell your teacher that this is a really dumb question to have their students asking, and reflects badly on their competence. Only someone completely ignorant of the history of astronomy would ask such a stupid thing. We're always getting questions like this, and "Who invented Mars?" etc. Don't teachers realize that astronomy is older than human history, and virtually all the names predate written records?