5.89
Apparent Mag6,000
Distance (ly)F7pe-G0pe
Spectral Type7,000
Temperature (K)R Coronae Borealis is the prototype of RCB variables. It normally shines at magnitude 6 but unpredictably fades by up to 8 magnitudes when carbon dust clouds form.
Stellar Data
Apparent Magnitude5.89
Absolute Magnitude-4.9
Distance6,000 light-years
Spectral TypeF7pe-G0pe
Temperature7,000 K
Luminosity10,000 L☉
Radius85 R☉
Mass0.9 M☉
Right Ascension15h 48m 34.4s
Declination+28° 09′ 24.3″
ConstellationCorona Borealis
Notable Facts
- R CrB normally shines at magnitude 6 but can fade to 14th magnitude
- It is hydrogen-deficient and carbon-rich, creating soot clouds
- The star may result from a white dwarf merger