B-type star · blue-white star

21 Per

320 lybrightness mag 5.10B9p...

Also catalogued as HR 873 · HD 18296 · HIP 13775

10,213 K

temperature

5.10

apparent magnitude

76.35× ☉

luminosity vs Sun

B9p...

spectral type

Distance & comparison with our Sun

320 years

at light speed from Earth

1.77×

as hot as the Sun

76.35×

the Sun's light output

0.14

absolute magnitude

Explore from here · roam the neighborhood

21 PerB-type

Sky regionPerseusthis direction

Nearest stars

HR 831 →32 ly apart
35 Ari →38 ly apart
25Rho Per →41 ly apart
22Pi Per →44 ly apart
HR 803 →45 ly apart
60 Ari →48 ly apart

Bright stars in Perseus

Mirfak →mag 1.8
44Zet Per →mag 2.8
45Eps Per →mag 2.9
23Gam Per →mag 2.9
39Del Per →mag 3.0
25Rho Per →mag 3.3
Miram →mag 3.8
41Nu Per →mag 3.8

Can you see it tonight?

VISIBLE TO THE NAKED EYE

Brightness mag 5.1To see it no equipment neededLook toward Perseus

Star data from the HYG database v4.2 (Astronexus, CC BY-SA 4.0). Temperature and colour computed by gravityfinder from the B-V colour index; the illustration is generated from that temperature, not a photograph.