Located within the constellation Perseus lies a star called Algol, also known as ‘Demon Star’ or ‘The Ghoul’. You can spot this star during the autumn months, along with Cassiopeia and Andromeda in the northeastern sky, beginning after 9 PM. In Greek mythology, this star represents the ‘blinking eye’ of the gorgon Medusa.
Algol is a triple-star system, with two of the three stars orbiting one another. Using data from NASA’s Transiting Exoplanet Survey Satellite mission, this light curve shows the regular dimming, or Medusa’s ‘blinking eye’!
Because it has a similar magnitude of brightness, you can compare Algol’s brightness to the nearby star Almach in Andromeda using a small telescope or binoculars.
Between the Eridanus and Orion constellations lies a spooky silhouette, illuminated by the star Rigel. IC 2118, or the Witch Head Nebula, is a reflection nebula about 900 light-years away from Earth.
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