A-type star · white star

HD 21684

HD 21684 is a white star in the constellation Perseus 377 ly from Earth. Its surface is about 7,844 K, about 1.4 times the Sun's surface temperature, and it shines at 29.30× the Sun's brightness. At magnitude 6.5 it is within reach of 50 mm binoculars; the light you see left it 377 years ago.

377 lybrightness mag 6.50A5

Also catalogued as HIP 16425

7,844 K
temperature
6.50
apparent magnitude
29.30× ☉
luminosity vs Sun
A5
spectral type
Distance & comparison with our Sun
377 years
at light speed from Earth
1.36×
as hot as the Sun
29.30×
the Sun's light output
1.18
absolute magnitude
Explore from here · roam the neighborhood
HD 21684A-type
Sky regionPerseusthis direction
StarHR 117636 ly
StarHR 92344 ly
StarHR 104147 ly
StarMirfakstar
StarZeta Perstar
Nearest stars
Bright stars in Perseus
Can you see it tonight?
BINOCULARS NEEDED
Brightness mag 6.5To see it 50 mm binocularsLook 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.