Magnitude 5.1 | Constellation Perseus | |
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21 Persei is a star in the constellation Perseus. Its apparent magnitude is 5.10. Located around 98.03 parsecs (319.7 ly) distant, it is a hot blue star of spectral type B9. The star is an Alpha2 Canum Venaticorum variable, meaning that the star has a strong magnetic field chromium, silicon, and strontium spectral lines. 21 Persei's period is approximately 2.88 days
References
21 Persei Wikipedia(Text) CC BY-SA