## Algol

Algol, also know as $\beta$ Persei (26), HR936, HD19356, SAO38592, at R.A.= 3h08m, dec=41° is an eclipsing binary star. Algol's magnitude is typically 2.1, but every two days, 20 hours and 49 minutes it dips to 3.4 for about 10 hours.

## Perseus

In the below Wiki image, the red arrow marks the location of Algol in Perseus.