Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Alpha Mensae is the brightest star in the constellation Mensa. At a magnitude of 5.09, it is the dimmest lucida in all the heavens. It is a main sequence dwarf star only slightly smaller and cooler in temperature than the Sun. Due to its declination, on Earth it is best visible from higher latitudes of the southern hemisphere, yet can also be seen, though low in the sky, from just north of the Equator when near its daily arc's highest point, the culmination.