Hopefully if you are reading this thread you have a passing interest in astronomy as well as photography. My recent posts have concerned the North American nebula. This post is veering a little off topic so very
quickly there are two other really interesting objects in the picture above. Both are stars and both are about three quarters of the way across the frame.
The brightest star is Deneb (Wikipedia
). It is about one quarter of the way up from the bottom. It is about 60,000 times more luminous than the Sun, has a surface temperature of about 8,400 Kelvin (the Sun is around 5,700 K) and check out its size:
The second is much less spectacular but extreme in its own way. Go up from Deneb in the picture and about halfway up there is a very red star - so red you might think it was a stuck pixel. Not so: the star is "V Cyg" (Cyg is short for Cygnus; the SAO number is 49940) and it is a Carbon Star
. Carbon stars are evolved cool giants (but sometimes dwarf stars) with circumstellar shells or clouds of carbon dust material. Typical surface temperatures range from 2000 K to 3000 K. If you want more there is an article on Wikipedia
Next time you go out at night watch out. You never know what's lurking above you.