One of these stars is not like the others – what’s going on? M103 is also known as NGC 581.
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Featuring Professor Mike Merrifield from the University of Nottingham.
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PAPER: Photometric and Kinematic Studies of Open Star Clusters I: NGC 581 (M 103) — https://arxiv.org/abs/astro-ph/9908059
M103 as APOD: https://apod.nasa.gov/apod/ap010207.html
Pic by Hillary Mathis & N. A. Sharp, KPNO 2.1-m Tel., AURA, NOAO, NSF
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Video by James Hennessy and Brady Haran