Constellation Perseus
A prominent northern constellation containing the prototype eclipsing binary star Algol (Beta Persei- ‘Demon Star’ in Arabic) and represented as the eye of Medusa
Mirfak (Alpha Persei – Arabic, ‘elbow’) is a yellow supergiant star shining at magnitude 1.8
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Perseus is home to nebulae & bright star clusters including the open clusters NGC 869 & NGC 884, The Sword-Handle (Double Cluster) & M34.
            
                Double Cluster film image at 60-minutes from a 130mm f/8 triplet refractor
John Goodricke first proposed mechanism for the variability of this star in 1783
Edward Pickering presented evidence that Algol was actually an eclipsing binary in 1881
This was proven by presented evidence that Algol was actually an eclipsing binary in 1889