NGC 6540 is a globular cluster in the constellationSagittarius. Its apparent magnitude is 9.3[2] and its diameter is about 9.5 arcminutes, with 12 faint stars visible. It is about 17,000 light years away from Earth and was discovered by Wilhelm Herschel on May 24, 1784 with an 18.7-inch mirror telescope, who described the cluster as "pretty faint, not large, crookedly extended, easily resolvable".
6540, globular, cluster, constellation, sagittarius, apparent, magnitude, diameter, about, arcminutes, with, faint, stars, visible, about, light, years, away, from, earth, discovered, wilhelm, herschel, 1784, with, inch, mirror, telescope, described, cluster, . NGC 6540 is a globular cluster in the constellation Sagittarius Its apparent magnitude is 9 3 2 and its diameter is about 9 5 arcminutes with 12 faint stars visible It is about 17 000 light years away from Earth and was discovered by Wilhelm Herschel on May 24 1784 with an 18 7 inch mirror telescope who described the cluster as pretty faint not large crookedly extended easily resolvable Imaged by the Hubble Space Telescope in August 2022 NGC 6540Observation data J2000 epoch ConstellationSagittariusRight ascension18h 06m 08 60s 1 Declination 27 45 55 0 1 Distance17 3 kly 5 3 kpc Apparent magnitude V 9 30 2 Physical characteristicsAbsolute magnitude 6 35 2 Radius4 75 x 4 75 2 Metallicity Fe H displaystyle begin smallmatrix left ce Fe ce H right end smallmatrix 1 35 3 dexOther designationsCr 364 Djorg 3 VDBH 258 C 1803 278 1 See also Globular cluster List of globular clustersReferences Edit a b c NGC 6540 SIMBAD Centre de donnees astronomiques de Strasbourg Retrieved 7 January 2017 a b c d NGC 6540 Retrieved 15 January 2016 A Galactic Globular Clusters Database NGC 6540 Retrieved 15 January 2017 Robert Burnham Jr Burnham s Celestial Handbook An observer s guide to the universe beyond the solar system vol 3 p 1556External links EditNGC 6540 This star cluster related article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title NGC 6540 amp oldid 1112872709, wikipedia, wiki, book, books, library,