Andromeda a is one of the forty-eight constellations listed by the 2nd century Greco-Roman astronomer Claudius Ptolemy, and is currently one of the eighty-eight modern constellations. Located north of the celestial equator, it bears the name of Andromeda, the daughter of Cepheus and Cassiopeia, who was chained to a rock to be eaten by the sea monster Ceto. It is most visible on autumn nights in the northern hemisphere, like other constellations named after characters from the Perseus myth. Given its northern declination, Andromeda is only visible north of latitude 40 ° south. For the more southerly observers, it is always below the horizon…