How to see it
21 Cas has a visual magnitude of about 5.63: under a reasonably dark sky it is typically reachable with the unaided eye.
Sky position
Equatorial coordinates for 21 Cas: right ascension 0h 45m 39s, declination +74° 59′ 17″ (J2000), in the region of the Cassiopeia constellation (IAU figure Cas).
Catalog context
21 Cas. It appears in classical and modern catalogs as HIP 3572, HD 4161, Gaia DR3 539047365205648128. In the SkyKeepsake Cassiopeia (Cas) browse hub it sits with other stars of the same IAU figure.
Catalog identifiers
- Gaia
- Gaia DR3 539047365205648128
- HIP
- 3572
- HD
- 4161
- gaia_dr3
- 539047365205648128
- Bayer / Flamsteed
- 21 Cas
Also known as
- Gaia DR3 TOP 5M 539047365205648128
- HD 4161
- HIP 3572
Observed properties
- Visual magnitude
- 5.63