3.23
Apparent Mag690
Distance (ly)B2IIIe
Spectral Type27,000
Temperature (K)Alfirk is a hot blue giant in Cepheus and the prototype of the Beta Cephei class of pulsating variables.
Stellar Data
Apparent Magnitude3.23
Absolute Magnitude-3.08
Distance690 light-years
Spectral TypeB2IIIe
Temperature27,000 K
Luminosity9,100 L☉
Radius8.6 R☉
Mass12 M☉
Right Ascension21h 28m 39.6s
Declination+70° 33′ 38.6″
ConstellationCepheus
Notable Facts
- Alfirk is the prototype of the Beta Cephei class of variable stars
- These stars pulsate with periods of 3 to 7 hours
- The name means the flock in Arabic