Globular cluster in the constellation Delphinus
NGC 6934 (also known as Caldwell 47) is a globular cluster of stars in the northern constellation of Delphinus, about distant from the Sun. It was discovered by the German-born astronomer William Herschel on 24 September 1785. The cluster is following a highly eccentric orbit (with an eccentricity of 0.81) through the Milky Way along an orbital plane that is inclined by 73° to the galactic plane. It may share a common dynamic origin with NGC 5466. As of 2018, it has been poorly studied.
This appears to be a Oosterhoff type I cluster with an intermediate metallicity. It has an Shapley–Sawyer Concentration Class of VIII, with a core radius of and a half-light radius of . The estimated mass is 295,000 times the mass of the Sun. The cluster displays photometric anomalies, with a split subgiant branch on the HR diagram. Searches for variable stars have discovered 85 in the cluster field, of which 79 are of the RR Lyrae class and one is a SX Phe variable. There is some evidence for a tidal tail.
References.
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External links.
 ;indicator name="01-sky-coordinates" ; ;templatestyles src="Template:Sky/styles.css" / ;Coordinates: &amp;zoom=&amp;show_grid=1&amp;show_constellation_lines=1&amp;show_constellation_boundaries=1&amp;show_const_names=1&amp;show_galaxies=1&amp;img_source=IMG_all 20h 34m 11.5s, +07° 24′ 14.9″ ;/indicator ;