Universe Guide

Triangulum, The Triangle Constellation

Triangulum Constellation Star Map

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. Triangulum is the 78th largest in terms of size in the night sky.

The constellation 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.

There are 3 stars that make up the main constellation. The hipparcos satellite scanned and detailed 322 stars. There are 18 stars that can be seen with the naked eye in the constellation on a very clear night sky.

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.

There are 4 Extrasolar Planets (Exoplanets) in this constellation that are detailed on this site. There is a dedicated page for exoplanets in Triangulum.

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.

The image at the top right of this page was generated using Night Vision, a free to use and download application by Brian Simspon.

Distance to Triangulum

You can't just go to one location and arrive at the constellation because the constellation is made up of stars at different locations and different distances. The nearest main star in the constellation is at a distance of 63.33 light years and the furthest main star is a distance of 126.86 light years. The average distance to the main stars is 100.84 light years.

Triangulum Star Facts

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.

Delta Trianguli, Triangulum's Nearest Star

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.

HIP 13148, Triangulum's Furthest Star

The furthest star that is located in the constellation is HIP 13148 and it is 32616.33 light years away from the Sun.

Beta Trianguli, Brightest Star in Triangulum

The brightest star in Triangulum is Beta Trianguli and is located about 83.86 light years from the Sun. The star has a apparent magnitude of 3 but an absolute magnitude of 0.05 when the star is viewed from a distance of 10 Parsecs or 32.6 Light Years. The star is only recognised as being Beta Trianguli rather than having Alpha status.

HD 10348, Triangulum's Dimmest Visible Star

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.

Triangulum Mythology

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.

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
Brightest StarBeta Trianguli
Dimmest StarHD 10348
Furthest StarHIP 13148
Bright Star Count18
Hipparcos Star Count322
Main Star Count3
Messier Deep Space Object Count1
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.

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

NameTypeDistanceDeclinationRight Ascension
3C 48Quasar+33 09 35.07912603801 37 41m 2995845985
NGC 1002Galaxy in a Group of Galaxies+34 37 20.17231420202 38 55m 6309217059
NGC 588Diffuse Nebula+30 38 5401 32 45m 2
NGC 595Diffuse Nebula+30 41 29.801 33 33m 53
NGC 604Nebula2,700,00030:47:061h 34h 33m 2
The Triangulum Galaxy (M33, NGC598)Spiral Galaxy2,380,000 - 3,070,00+30:3901h 33m 9

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