Meaning: The Triangle

Triangulum outline

Print out the star map from Sky and Telescope

Things to look for:
M33 Triangulum Galaxy

Messier objects:
M33 [5.8]

Note: [x.x] indicates visual magnitude

Pronunciation: try ang’ yoo lum
Associated Asterisms: None
% of the sky: 0.32%
Visible Stars: 12 stars brighter than magnitude 5.5


Triangulum Star Chart

Triangulum sits in a small area bounded by Andromeda, Aries, Perseus and Pisces. It is a small constellation ranking 78th in the list from big to small. It does however contain a pearl in the form of M33 the Triangulum Galaxy. A short hop from M31 and M32 in Andromeda, it requires a good dark sky to be fully appreciated.







Locating Triangulum

Triangulum mythology

You can locate Triangulum simply by following the line of the top two stars of the Square across to the left/east by 150% of that distance again.

The name is Latin although the origin is disputed. It has appeared as a constellation since earliest times.







Messier objects

M33 Triangulum Galaxy

M33, the Triangulum Galaxy, is a satellite of the Andromeda Galaxy M31. It is an edge on spiral giving an impressive view in darker skies. In the very darkest skies it is visible to the naked eye. Not a huge galaxy compared to Andromeda and the Milky Way, it is 46,000 light years across; about 50% of the Milky Way. A good object for newbie astrophotographers to provide a challenge as with the eye, little detail is visible.