Triangulum

Triangulum is a small northern constellation between Andromeda and Aries. It contains the Triangulum Galaxy (M33), the third largest in the Local Group. M33 is one of the most distant objects visible to the naked eye at about 2.7 million light-years.

Location in the Sky

When to Observe

Triangulum is best observed during December. It is located in the NQ1 quadrant and is primarily visible from the northern hemisphere. The constellation contains 3 main stars forming its asterism, with 8 Bayer/Flamsteed designated stars in total. Its brightest star is Mothallah.

Mythology & History

Triangulum was known to the ancient Greeks as Deltoton for its resemblance to the Greek letter delta. It has been associated with the Nile Delta, Sicily, and the trinity. The Romans knew it as Sicilia. It was one of Ptolemy's original 48 constellations.