Mensa is a
constellation in the southern sky, created in the 18th century. Its name is
Latin for
table. It covers a
keystone-shaped wedge of sky stretching from approximately 4h to 7.5h of right ascension, and -71 to -85.5 degrees of declination. Other than the south polar constellation of
Octans, it is the most southerly of constellations. As a result, it is essentially unobservable from the
Northern Hemisphere. Besides those already mentioned, its other neighbouring constellations are
Chamaeleon,
Dorado,
Hydrus, and
Volans.