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Messier 33, the Triangulum Galaxy

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The Triangulum Galaxy is the second closest spiral galaxy (after the Andromeda Galaxy), and it is a member of our local galaxy group. It covers an area of sky larger than the full moon, but because its light is spread out over a large area, it can be difficult to see when you first look through a telescope or binoculars. Once you find it, however, patient observation can reveal a lot of detail, including several knots of glowing hydrogen gas. These features are best seen under a good dark sky.
Evening visibility: September-February
Best viewed with: binoculars, telescope
  Printable chart (pdf) View larger image
Directions:
Start by finding the Great Square of Pegasus, which rises in the eastern sky during the early fall evenings, is high overhead later in the fall, and sinks in the western sky during early winter. To be sure you know how the square is oriented in the sky, look for the two stars outside the northwest corner of the square (circled in the chart below) that form a small triangle with Scheat.

Using the northern edge of the Great Square as a pointer, extend a line to the east about twice the size of the Square, and you will arrive in the vicinity of the constellation Triangulum, whose 3 brightest stars form a long and narrow triangle.

From the narrow tip of the triangle, move to the east about 2.5 degrees, which is roughly the distance between the other two stars in the triangle. As shown in the chart below, you should arrive at a 6th magnitude star that will be visible in binoculars or a finderscope. Move the same distance again in the same direction, and you will reach the location of Messier 33. Look for a very large but faint oval. To see it with your telescope, use the lowest power you can, make sure your eyes are dark adapted, and look for a patch that is slightly brighter than the surrounding sky.
Star charts created with Cartes du Ciel