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Brianetta — The colours of stars by-sa

Published: 2010-09-15 01:17:51 +0000 UTC; Views: 198; Favourites: 1; Downloads: 37
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Description It's not obvious to the unaided human eye, but the stars are many different colours. I recommend grabbing the full sized image to really see this, as DA's preview image is rather desaturated.

This is a back garden astronomical shot, taken using nothing more than my camera and a tripod. Comparing the image here with the sky as shown in Stellarium (an excellent, free, night sky program), the camera seems to have been pointing to azimuth 270° at altitude 60°. The EXIF time, and knowing that I'm in the UK, should be all you need to find this patch of sky and identify the stars.

These stars are actually these colours. The shot has been enhanced (a contemporaneous photo of the inside of the lens cap was used to eliminate hot pixels, some sensor noise etc) but basically this is the sky above my house as I type.

If you own an Olympus micro four thirds with the kit zoom lens, you will know that it's practically impossible to focus in the dark, and the lens doesn't have markings. It took a good few shots before I found focus by trial and error!
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Comments: 3

LadyCharis [2010-09-15 08:55:36 +0000 UTC]

I don't need to look at Stellarium to know that the constellation near the bottom is Cygnus

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Brianetta In reply to LadyCharis [2010-09-15 14:48:34 +0000 UTC]

It is. (-: The bright star at the very bottom, to the right, is Vega, which was just rising over the roof of my house. It's 25 light years away. The next brightest star, the one just below the middle of the frame, is Deneb. It's about 1,500 light years away (the exact distance is uncertain, but Stellarium's figure of 3,200 light years is way, way off). The fact that it can be seen at this distance means that it's a very, very large and bright star indeed.

👍: 0 ⏩: 1

LadyCharis In reply to Brianetta [2010-09-15 16:49:40 +0000 UTC]

👍: 0 ⏩: 0