Your guide to the Solar System and the night sky
🌎 Location: Greenwich, United Kingdom [change]

Triangulum (The Triangle) Constellation

Triangulum (pronounced traɪˈæŋɡjʊləm) is the Latin name of a constellation situated north of the celestial equator. As such, it is more easily visible from the northern hemisphere.

In English language this constellation is also known as "The Triangle" while in astronomical texts and literature this constellation is often abbreviated as "Tri" (according to the standard of the International Astronomical Union - IAU) or as "Tria" (according to a naming convention used by NASA).

The Latin genitive of the constellation name is "Trianguli" (pronounced traɪˈæŋɡjʊlaɪ) and it is used to identify some of the brightest stars in this constellation based on the Bayer or Flamsteed star naming convention. For instance: α Trianguli (the brightest star of Triangulum based on the Bayer catalog); or 23 Trianguli (the 23th star in the constellation of Triangulum based on the Flamsteed catalog).

Triangulum is above the horizon from Greenwich, United Kingdom [change]. Altitude: 12°.
Available Resources for Triangulum

Sky Chart of Triangulum Constellation

Here we provide a simplified sky chart of the Triangulum constellation. Alternatively it is possible to locate Triangulum in the night sky using our Online Interactive Planetarium.

Chart of  constellation
This constellation image is derivatve work based on original work by IAU and Sky & Telescope magazine (Roger Sinnott & Rick Fienberg) CC-BY-3.0.

Visibility of Triangulum Constellation

Location: Greenwich, United Kingdom [change]
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

Today's Triangulum rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 57.6°
Max altitude: 70.9°
Azimuth: 302.4°
Triangulum is above the horizon from Greenwich, United Kingdom

The rise and set times provided here are just directional indications and they refer to a point approximately placed at the center of the constellation. In case of very large constellations these times can have little relevance.

Bright Stars in Triangulum Constellation

The table below lists the top 20 brightest stars in the Triangulum constellation. See also the complete list of 26 stars brighter than magnitude 6.5 (approximate) in the constellation of Triangulum. Click on each star to see more details about it.

HR Number(*) Star designation Proper name Visual magnitude Color Notes
HR622 β Trianguli 3
HR544 α Trianguli Mothallah 3.41 Multiple;
HR664 γ Trianguli 4.01
HR660 δ Trianguli 4.87 Double;
HR642 6 Trianguli 4.94 Variable; Double;
HR675 10 Trianguli 5.03 Double;
HR736 14 Trianguli 5.15
HR655 7 Trianguli 5.28
HR717 12 Trianguli 5.29
HR758 5.3 Variable;
HR750 15 Trianguli 5.35 Variable; Double;
HR599 ε Trianguli 5.5 Variable; Double;
HR712 11 Trianguli 5.54
HR490 5.64
HR523 5.79
HR564 5.82
HR738 5.83
HR720 13 Trianguli 5.89
HR485 5.99
HR757 6.1
...go to the complete list of 26 bright stars in the constellation of Triangulum

(*) HR stands for Harvard Revised Bright Star Catalogue, which is also known as the Yale Catalogue of Bright Stars.

Deep Sky Objects in Triangulum Constellation

The table below lists the 20 brightest deep sky objects in the Triangulum constellation. See also the complete list of 113 deep sky objects in the constellation of Triangulum. The list includes objects from the Messier, New General Catalogue (NGC) and Index Catalogue (IC).

Name Type Magnitude
Messier 33 (Triangulum Galaxy) Galaxy 5.72 (V)
NGC 925 Galaxy 10.12 (V)
IC 136 Association of Stars 11.04 (B)
NGC 672 Galaxy 11.09 (V)
IC 143 HII Ionized region 11.4 (B)
NGC 777 Galaxy 11.45 (V)
NGC 890 Galaxy 11.62 (V)
NGC 1060 Galaxy 11.81 (V)
NGC 949 Galaxy 11.98 (V)
IC 1727 Galaxy 11.98 (V)
NGC 784 Galaxy 12.07 (V)
NGC 959 Galaxy 12.38 (V)
NGC 969 Galaxy 12.41 (V)
IC 131 HII Ionized region 12.52 (B)
NGC 670 Galaxy 12.72 (V)
NGC 855 Galaxy 12.75 (V)
NGC 783 Galaxy 12.84 (B)
NGC 751 Galaxy 12.9 (B)
NGC 750 Galaxy 12.9 (B)
NGC 661 Galaxy 13 (B)
...go to the complete list of 113 deep sky objects in the constellation of Triangulum