Collinder 399 (Cr 399) is a random grouping of stars located in the constellation Vulpecula near the border with Sagitta. The brighter members of this star cluster form an asterism also known as the Coathanger. In astronomy, an asterism is any pattern of stars recognized in the Earth's night sky. It may be part of an official constellation or it may be composed of stars from more than one constellation. Asterisms are composed of stars which, although visible in the same general area of the sky as viewed from Earth, they can be located at very different distances from Earth, at great distances from each other. The asterism is made up of 10 stars ranging from 5th to 7th magnitude which form the conspicuous "coathanger", a straight line of 6 stars with a "hook" of 4 stars on the south side.
It was first described by the Persian astronomer Al Sufi in his Book of Fixed Stars in 964.
On the lower left side of the image you can see the Sh2-82 which is also called the Little Cocoon Nebula. It’s located about 3590 light years from the Earth in the constellation Sagitta. Sh2-82 is a relatively small emission nebula, surrounded by a blue reflection nebula. There is a long dark lane of dust running diagonally near the Little Cocoon Nebula, blocking out starlight behind it.
INSTRUMENT Canon EF 70-200mm F/2.8 II
CAMERA Canon EOS 60Da
MOUNT Vixen Sphinx
GUIDING Lacerta MGen Autoguider
EXPOSURE TIME 114x5min iso 800
LOCATION Croatia
DATE 2017.07.
