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The blue star is like Alkyone a member of the Pleiades. Merope illuminates a near reflection nebula which belongs to the gas that surrounds the Pleiades.

Constellation: Taurus
Age: 80 million years
Distance: 407 light-years
Spectral class: B6
Visual magnitude: 4.27
Luminosity: 6300 * Sun
Mass: 4.5 * Sun
Diameter: 4.3 * Sun
Radial velocity: 6.2 km/sec

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The star itself is at the upper left just outside of the picture.
Photo: Hubble Heritage Team, George H. Herbig & Theodore Simon (IfA, U. Hawaii), NASA

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