I setup the C14 at f/7 last night. Here’s the moon taken with the Canon 500d through an Astronomik CLS filter. For deep sky objects, the CLS filter works very well to reduce light pollution by filtering out light normally produced by artificial sources. To do this, it lets through light in the Ha, Hb, [...]
A group of stars that, from our line of sight here on Earth, forms a familiar pattern or other recognizable pattern is called an asterism. These groups of stars are not necessarily bound to one another as members of an open cluster or globular cluster are. It can just be happenstance that the stars line up “just right”. In this case, the Coat Hanger asterism in the constellation Vulpecula. This is a great target to check out with binoculars. It’s near the bright, colorful double-star Albireo in Cygnus.
This image shows the coat hanger with the open cluster NGC 6802 just off the end of the hanger’s rod. In the lower left are IC 1299 (a small open cluster) and a number of planetary nebula that show as fuzzy red dots.
This asterism is cataloged as Collinder 399 and is also known as Bracchi’s cluster or Al Sufi’s cluster (being recorded by him over 1000 years ago).
FSQ106EDXIII @ f/5
Canon 500d (Astrodon)
(Click to enlarge)