3.75
Apparent Mag887
Distance (ly)F5Ib-G2Ib
Spectral Type5,900
Temperature (K)Delta Cephei is the prototype of the Cepheid variable class. These crucial distance indicators pulsate with a period-luminosity relationship that enables measurement of cosmic distances.
Stellar Data
Apparent Magnitude3.75
Absolute Magnitude-3.47
Distance887 light-years
Spectral TypeF5Ib-G2Ib
Temperature5,900 K
Luminosity2,000 L☉
Radius43 R☉
Mass4.5 M☉
Right Ascension22h 29m 10.3s
Declination+58° 24′ 54.7″
ConstellationCepheus
Notable Facts
- Delta Cephei is the prototype of Cepheid variable stars
- Cepheids were key to proving the universe extends beyond our galaxy
- It pulsates with a period of 5.37 days, changing by about 0.9 magnitudes