Use Great Square of Pegasus to find Andromeda galaxy

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Tonight for November 20, 2011

You can see the Andromeda galaxy at this time of year … simply by looking eastward at nightfall. By late evening, this galaxy will climb almost straight overhead, so you might want to enjoy the comfort of a reclining lawn chair for viewing this deep-sky treasure.

This neighboring spiral galaxy appears in our sky as a large hazy patch – bigger than a full moon. It’s very noticeable in a star-filled sky, far from city lights, on a night when the moon is down.

More about M31: Great galaxy in Andromeda

If you need some help finding the Andromeda galaxy, there are a couple of different ways to use neighboring constellations to find it.

One way to find the galaxy is by finding the Great Square in the constellation Pegasus. The Great Square consists of a large square pattern of stars in the east at nightfall. By mid-evening, the Great Square swings way up high in your southern sky. Extending from the Square, you’ll find two graceful streams of stars – another constellation, Andromeda. I learned to find the Andromeda galaxy by “star-hopping” from the star Alpheratz in Great Square to the two stars marked here – first Mirach, then Mu Andromedae. An imaginary line drawn through these two stars points to the Andromeda galaxy. If you can’t see the Andromeda galaxy with the unaided eye, try binoculars.

But I said there were a couple of ways to use neighboring constellations to find the Andromeda galaxy. You can also find this wonderful galaxy using the constellation Cassiopeia.

Use constellation Cassiopeia to find Andromeda galaxy

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4 Responses to Use Great Square of Pegasus to find Andromeda galaxy

  1. Capt. Frank Cassianna says:

    IIIII and a beautiful site is she…Andromeda, Andromeda, you come closer everyday.

  2. Lisa Powers says:

    Any idea what was streaking across or falling out of the sky around 5:25pm PST going North? It looked to have a double nucleus and very bright. It was definitely burning up and on a downward course. The largest thing I’ve ever seen moving across the sky. I’m just north of Nevada City, CA.

  3. [...] constellation of Andromeda the easiest way to find it is to locate the neighbouring asterism the Square of Pegasus in the West and draw a line from the star Markab in the lower righthand corner, up through Sirrah [...]

  4. [...] The first step in locating the Andromeda galaxy is to find the ‘great square’ of Pegasus.  The Guardian’s Starwatch section has some good, clear maps;  once you’ve found Pegasus, you can use this map at EarthSky. [...]

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