NGC 663 (also known as Caldwell 10) is a young open cluster in the constellation of Cassiopeia. 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.[1]
- NGC 663 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
| NGC 663 | |
|---|---|
 NGC 663 in Cassiopeia | |
| Observation data (J2000 epoch) | |
| Constellation | Cassiopeia |
| Right ascension | 01h 46.0m |
| Declination | +61° 15′ |
| Distance | 6,850 ly (2,100 pc) |
| Apparent magnitude (V) | 7.1 |
| Apparent dimensions (V) | 16.0′ |
| Physical characteristics | |
| Other designations | Caldwell 10, Cr 20 |
https://en.wikipedia.org/wiki/NGC_663
Note. X-RAY, alpha hydrogen (Hydrogen α), Open Cluster Reported by Earth.
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