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), on the celestial sphere.

Catalog context

21 Per. It appears in classical and modern catalogs as HIP 13775, HD 18296, Gaia DR3 135525184764395776.

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