The very basic knowledge that every amateur astronomer has is to recognize the constellations above his/her head. No matter what you are looking for on the sky they can guide you to find it. Think of them as a map, which you need to learn how to use in order to go wherever you decide.

Even though, this is mainly a "How to" site, I’ll say a few word about some of the best known asterisms, grouping them in Northern, Summer and Winter constellations. After that we'll see how to photograph them.

Trying to memorize the shapes and locations of all constellations at once is not necessary (or even possible). There are a few main reasons for that. First of all, most of us won’t be able to see all of them from the location where we live - unless you live on the equator. So try to learn those you can observe frequently. Another reason is the fact that some of the asterisms are very small, and you may not need them immediately to guide yourself on the sky. Last but not least, the only way to remember their shapes and locations is by observing and only observing.  Making periodic observations is the only way of becoming familiar with the sky!

I’m not going to describe every single constellation. This is not the goal of this website and frankly, there is no need for that. I’m sure you can find some star chart (even a basic one will do the job initially) or you may already have one. With such chart in hand you can start learning and finding on the sky the basic constellations, and later you can try some others that are not so distinct or as large. Thus I’m going to mention only the most famous ones, even though you may have your own favorites.

There are some that are visible throughout the entire year. Examples of such are The Big Bear and The Little Bear, Draco, Cassiopeia, etc. They are visible from most parts of the northern hemisphere. Read more...

The summer sky presents us with the opportunity to observe a lot of interesting constellations. There are lots of interesting summer asterisms. Let’s start with the most famous one (which is not a constellation) - The Summer Triangle. It connects the stars Vega (constellation Lyra), Deneb (Cygnus “swan”) and Altair (Aquila “eagle”). All three stars are bright with apparent magnitudes ~0-1. Read more...

The winter sky reveals us magnificent view, its crown, without a doubt, is the constellation Orion. Next to "The Hunter" are located the hunting dogs (Canis Major and Canis Minor), and the Bull (Taurus).. Read more...

As you know all constellations have different sizes. Therefore you can choose lenses with focal lengths roughly between 24-135 mm (for 24x36 film equivalent). You need the longer focal lengths, 80-135 mm, if you want to photograph small constellation and if you want to have only one on your image. At these focal lengths you’ll need telescope to mount your camera on, or equivalent tracking device. ISO values of 100 to 400 will do the job.

The easiest way of taking photos of constellations is using tripod and 35-50 mm lens and set them at maximum aperture (lowest f-number) - see te next paragraph for more details. Then do 20 sec exposure. Longer exposure times will make your stars to look like short trails instead of points. If you use shorter lens you may be able to take 30 sec shot and still have the stars as points. For lenses longer than 80 mm, or even 50 mm, you’ll need a tracking device, or make exposures of several seconds.

You can also leave your camera open for a few minutes. As a result, the stars will create small trails (like the image above). You can increase the exposure time to half an hour or as long as you like. You can make really beautiful shots if you point your camera in the direction of the north celestial pole (Polaris) and let your camera open for an hour or two. When taking pictures with exposure times of 10 min or longer, make sure that the lens’ f-number is not lower than 2.8! Do not forget that the sky is not entirely black and has some natural light. It’s called an airglow. So to reduce its effect, keep an eye on the lens settings. After all, we want the sky to look as dark as possible on our nice photos.

The good thing about shooting from tripod is that it’s easy to do and doesn’t require almost any equipment – just a camera and the tripod itself. However it has its downsides. Your photos will have only the main stars, the bright ones (brighter than 3 or 4 magnitude). If you want to make photos rich of stars and/or nice image of Milky Way, you will have to increase your exposure time to minutes. And in this case you will need a telescope.

Mounting camera on a telescope, or piggyback astrophotography, is the best way to go. You can do exposures with any length – seconds, minutes or even hours. For best results use 5 to 20 min exposure times and set your f-number not lower than 2.8 to avoid an airglow overexposure.

Other constellation resources

Constellations and backyard stargazing

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