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Triangulum, The Triangle Constellation

Triangulum (Pronounciation:Try-ang-u-lum, Abbrev:Tri, Latin:Trianguli) is a constellation, one of 88 constellations that the night sky is divided into. The sky is not divided up equally between the constellations. Triangulum takes up 131.847 sq. degrees of the night sky which equates to 0.32% of the night sky. The constellation gets its name as it name means The Triangle . The constellation is one of the original constellations that was devised by the Ancient Greco-Egyptian astronomer Ptolemy who lived between 90 A.D. and 168 A.D.

Triangulum is not a member of the Zodiac group of twelve constellations that appear when the Sun sets. Triangulum is a southern hemispheric constellation which means it can't be seen easily or at all from the northern hemisphere.

The brightest star in Triangulum is Beta Trianguli. There are 4 Extrasolar Planets (Exoplanets) in this constellation that are detailed on this site. There is a dedicated page for exoplanets in Triangulum. For a list of named stars, that is stars that don't start HD or HIP, please visit Triangulum Star List Page.

Triangulum Star and Deep Space Object Count

The number of stars that have been catalogued as part of the Hipparcos Star Catalogue from Triangulum is 322. The number of stars that are of magnitude 6.0 or lower in the constellation is 18. The number of stars in the constellation that make up the outline is 3.

There are 1 deep space objects that were identified by Charles Messier in this constellation. There are no non-Messier deep space objects in this constellation that are covered at present on this site.

Stars of Interest

The nearest star to Earth is Delta Trianguli which is roughly about 35.17 Light Years from the Earth. The nearest star to the Earth with an exoplanet is HD 9446 which is about 170.77 Light Years. The furthest star that can be located in the constellation is HIP 13148 which is located about 32616.33 Light Years away from the Sun.

The dimmest star that can be seen in Triangulum with the naked eye is HD 10348. The dim star has an apparent magnitude of 5.97. The dimmest star that a person is able to see with their naked eye is 6.0 magnitude based on the table in the reference. Ref: University of Michigan

The caveat of these stars are that they are catalogued on this site. If you know of a star that is nearer or further then do let me know in the comments and I'll add it to the site. The stars mentioned are from the Hipparcos catalogue or have been added because of their special status.

Triangulum was previously referred to as Sicilia after the Island of Sicily. Ceres, the Goddess of the Island persuaded Zeus to put the Island in the skies.

There are no major meteor showers that radiate from within this constellation.

Triangulum Facts

Is a Zodiac Sign No
Brightest StarBeta Trianguli
Area131.847 sq. deg.
Percentage of Night Sky0.32%
Size Position78th
Hemisphere Southern
Site Exoplanet Count4
Meteor Shower Count6
Nearest StarDelta Trianguli
Nearest Star with Exoplanet(s)HD 9446
Dimmest StarHD 10348
Furthest StarHIP 13148
Bright Star Count18
Hipparcos Star Count322
Main Star Count3
Messier Deep Space Object Count1
*Non-Messier Deep Space Object Count0
Bordering / Neighbouring / Surrounding ConstellationsAndromeda

*Note: The number of Non-Messier Deep Space Object Count relates to how many are covered on this site not how many there are.

Triangulum Constellation Map

Triangulum Constellation Star Map

The map was generated using Night Vision, an awesome free application by Brian Simpson.

List of Deep Space Objects (Galaxies, Nebulas, Supernovas, etc) in Triangulum

NameTypeDistanceDeclinationRight Ascension
The Triangulum Galaxy (M33, NGC598)Spiral Galaxy2,380-3,070 kly+30:3901h 33m 9

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