M-type star · red

HR 6991

HR 6991 is a red in the constellation Corona Australis 640 ly from Earth. Its surface is about 3,576 K, about 0.6 times the Sun's surface temperature, and it shines at 227× the Sun's brightness. At magnitude 5.4 it is bright enough to see with the naked eye; the light you see left it 640 years ago.

640 lybrightness mag 5.42M2III

Also catalogued as HD 171967 · HIP 91494

3,576 K
temperature
5.42
apparent magnitude
227× ☉
luminosity vs Sun
M2III
spectral type
Distance & comparison with our Sun
640 years
at light speed from Earth
0.62×
as hot as the Sun
227×
the Sun's light output
-1.04
absolute magnitude
Explore from here · roam the neighborhood
HR 6991M-type
Sky regionCorona Australisthis direction
StarHR 692249 ly
StarHD 17440752 ly
StarHD 17539575 ly
StarBeta CrAstar
StarMeridianastar
Nearest stars
Bright stars in Corona Australis
Can you see it tonight?
VISIBLE TO THE NAKED EYE
Brightness mag 5.4To see it no equipment neededLook toward Corona Australis

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.