Hydra is the largest of the 88 modern constellations, and was one of the 48 constellations cataloged by 2nd century astronomer Ptolemy. Hydra’s head lies at a point about halfway between Procyon in Canis Minor and Regulus in Leo. From there, it snakes (pun intended) south and eastward below Leo and Virgo, sharing two stars with Crater along the way, before ending just below the right scale of Libra. Hydra’s head reaches its highest nightfall ascension in March, but the tail does not reach that point until three months later in June. The best over all view of Hydra is in late April. Hydra is home to three Messier objects: M83 (the Southern Pinwheel Galaxy), M68 (a globular star cluster), and M48 (an open star cluster).
© James R. Johnson, 2014.