Hydrusis a constellation of the far-southern skies invented in the late 16th century by the Dutch navigators Pieter Dirkszoon Keyser and Frederick de Houtman. Lying between the bright star Achernar and the south celestial pole, it depicts a small water-snake. Hydra, known since the time of the ancient Greeks. The constellation's brightest star is Beta Hydri, magnitude 2.8.
Depiction: The Lesser Water Snake
Highest in the Sky: October to December
Size Ranking: 61st
Coverage Area: 243 Sq. Degrees
Right Acension: 2 hours
Visibility: 8°N to 90°S
h4375: Binary star
NGC 1511: Galaxy
Best Viewed Objects/Stars
A wide pair of unrelated stars, easy to divide through binoculars. Both are red giants. Pi-1 is of magnitude 5.6 and lies about 740 light-years away; Pi-2, magnitude 5.7, is about 470 light-years away.