How to see it
21 Per has a visual magnitude of about 5.09: under a reasonably dark sky it is typically reachable with the unaided eye.
Sky position
Equatorial coordinates for 21 Per: right ascension 2h 57m 17s, declination +31° 56′ 3″ (J2000), in the region of the Triangulum constellation (IAU figure Tri).
Catalog context
21 Per. It appears in classical and modern catalogs as HIP 13775, HD 18296, Gaia DR3 135525184764395776. In the SkyKeepsake Triangulum (Tri) browse hub it sits with other stars of the same IAU figure.
Catalog identifiers
- Gaia
- Gaia DR3 135525184764395776
- HIP
- 13775
- HD
- 18296
- gaia_dr3
- 135525184764395776
- Bayer / Flamsteed
- 21 Per
Also known as
- Gaia DR3 TOP 5M 135525184764395776
- HD 18296
- HIP 13775
Observed properties
- Visual magnitude
- 5.09