Constellation of Triangulum, with Andromeda and M31
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Triangulum, with Andromeda and M31
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Image and text ©2008 Akira Fujii/David Malin Images.

In the picture above north is at the top and the image covers 29.2 x 36.5 degrees.
Image centre is located at 01:30:14.2, +31:46:32 (H:M:S, D:M:S, J2000) Astrometric data from

Triangulum, with Andromeda and M31
Best seen in the early evening in December

Triangulum is one of the 48 constellations noted by Ptolemy and is one of the smallest of the modern star groupings codified in the 1930s. However, the most obvious triangle in this image joins the surrounding trio of yellow-orange stars, Almak, Mirach and Hamal, in which Triangulum is nicely placed. Of course almost any three stars can form a triangle but these two, one inside the other, make quite a distinctive asterism.

Constellations adjoining Triangulum: Andromeda, Aries, Perseus, Pisces.
Named star: Metallah, (α Tri)

Related images (other sources -- see also under 'Related Images' on the pages below)
INT 5.       The inner parts of M33 (NGC 598), the Pinwheel galaxy
INT 6.       The outer parts of M33 (NGC 598), the Pinwheel galaxy

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David Malin, 2017 April 29.