... Credit Copyright: Frank Barrett ( Celestial Wonders ) Explanation: Is this coat hanger a star cluster or an asterism? This cosmic hang-up has been debated over much of last century, as astronomers wondered whether this binocular-visible object is really a physically associated open cluster or a chance projection. ... On the far right of the above image is the open cluster of stars NGC 6802. ... Publications with keywords: open cluster - asterism . ... Open Star Clusters M35 and NGC 2158 . ...