A-type star · white star

21 Oph

21 Oph is a white star in the constellation Ophiuchus 379 ly from Earth. Its surface is about 9,487 K, about 1.6 times the Sun's surface temperature, and it shines at 73.45× the Sun's brightness. At magnitude 5.5 it is bright enough to see with the naked eye; the light you see left it 379 years ago.

379 lybrightness mag 5.51A2Vs

Also catalogued as HR 6255 · HD 152127 · HIP 82480

9,487 K
temperature
5.51
apparent magnitude
73.45× ☉
luminosity vs Sun
A2Vs
spectral type
Distance & comparison with our Sun
379 years
at light speed from Earth
1.64×
as hot as the Sun
73.45×
the Sun's light output
0.18
absolute magnitude
Explore from here · roam the neighborhood
21 OphA-type
Sky regionOphiuchusthis direction
Star45 Her31 ly
Star28 Her43 ly
Star30 Oph48 ly
StarSabikstar
StarZeta Ophstar
Nearest stars
Bright stars in Ophiuchus
Can you see it tonight?
VISIBLE TO THE NAKED EYE
Brightness mag 5.5To see it no equipment neededLook toward Ophiuchus

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.