Abbreviation: Â Tri
English Name: Â The Triangle
Genitive:Â Ras al Muthallath
Hemisphere:Â Â Northern Hemisphere
Location:Â Between the constellations of Aries and Andromeda.
Visible between latitudes: Â +90 and -50 degrees
Best season: Autumn/Winter
Seen in three seasons:Â Autumn, Winter and Spring
Best seen in:Â Late October / Early December
Seen between:Â October and December
Right Ascension (RA):Â Â 02 hour
Declination (DEC):Â Â +30 degrees
Area (square degrees): Â 132 (78th)
Triangulum  (The Triangle)
- Small, but easily found constellation between Andromeda and Aries.
- The famous galaxy -Â `The Triangulum Galaxy`Â at magnitude +5.8, it is bright enough to be seen by the naked eye under the darkest skies, but under light-polluted skies, it is challenging or invisible even in a small telescope or binoculars.
Messier Objects
- M33 Â – Â Spiral Galaxy; also known as `The Pinwheel Galaxy` or `The Triangulum Galaxy`, face-on with a low surface brightness, making it far more difficult to see than M31 (Andromeda Galaxy) in the constellation of Andromeda. Â It is best observed in binoculars and a larger telescopes from 8-inch or more, are required to detect NGC 604 – Emission Nebula (See below for more NGC 604’s details.)
Features of Interest
- NGC 604 Â – Â Emission Nebula; one of the largest known seething of star birth in M33, The Pinwheel Galaxy.
Named Stars
- Alpha Tri  (Ras al Muthallath)
Others
- Photo of the constellation;Â Triangulum, as it appears to the naked eye. (Lines have been added for clarity.)
- Sky Chart  –  Triangulum
- List of stars in Triangulum.
Back to The 88 Constellations Lists page.