NGC 772 (no. 72 in Arp’s catalogue of peculiar galaxies) is a spiral galaxy (Type Sb) located in the constellation Aries. At a distance of some 130 million lightyears from earth it has an actual diameter of about 100,000 lightyears and is thus about as large as our milky way. The remarkable disturbed shape is caused by its interaction with its neighbor NGC 770.
M 15 is the highlight in globular clusters in the autumn skies. Its age is believed to be about 13 billion years, hence its stars being almost as old as the universe itself! Located to the west of Pegasus it can easily be seen in the smallest telescopes. However, it requires large optics to resolve the core of this magnificent cluster.
In very steady skies, M 15 reveals a curiosity: The tiny Planetary Pease 1 located right within the cluster. Its visual size is only 3 arcsecs, therefore it must be about 0,98 lightyears in diameter.
NGC 6888 is known as the Crescent Nebula located right in the heart of Cygnus. The nebula is a so called Wolf-Rayet nebula. WR stars are very hot and massive stars blowing off their outer shells. NGC 6888 is energized by WR 136, the bright star in the center of the nebula.
Make sure you also have a look at the straight H-alpha image.
NGC 6946 is an almost perfect face-on spiral galaxy located in the constellation Cepheus. A large telescope reveals manifold detail. While the center and the inner arms are traversed by remarkable dust lanes, the star forming regions in the outer rims of the spiral arms stand out in prominent deep red.
Make sure to also look at our deep image which highlights the dim tails of the spiral arms.
NGC 6939 is an open cluster in the constellation Cepheus. Despite its large dimensions (appr. 10×10 arcmin.) it is often overseen due to its close vicinity to the famous spiral galaxy NGC 6946.