NGC 663 [SEP] constellation
NGC 663
NGC 663, also known as Caldwell 10, is young open cluster of about 400 stars in the Cassiopeia constellation. It has an estimated 400 stars and spans about a quarter of a degree across the sky. It can reportedly be detected with the unaided eye, although a telescope is recommended for best viewing. The brightest members of the cluster can be viewed with binoculars. Although the listed visual magnitude is 7.1, several observers have reported higher estimates.
After adjusting for reddening due to interstellar dust, the
- M107 NGC 6171
- M108 NGC 3556
- M109 NGC 3992
- M110 NGC 205
Herschel 400 objects which are also Caldwell objects.
The Herschel 400 catalogue pre-dates the Caldwell catalogue. The Caldwell catalogue contains 44 objects which are members of the Herschel 400:
- C2 NGC 40 Bow-Tie Nebula
- C6 NGC 6543 Cat's Eye Nebula
- C7 NGC 2403
- C8 NGC 559
- C10 NGC 663
- C12 NGC 6946
- C13 NGC 457 Owl Cluster