James Dunlop discovered NGC 6584 = D 376 = h3737 on 5 Jun 1826 and described a "pretty bright round nebula, about 1 1/4' diameter, moderately condensed to the centre; three very small stars involved in the preceding margin." He claims 4 observations and his position is 6.5' due west of center. John Herschel made two observations, first recording on 8 Jul 1834, "globular cluster; B; R; gmbM; entirely resolved into stars 16m; easily seen."

200/250mm - 8" (7/13/91 - Southern Baja): moderately bright, fairly small, 3' diameter, round, broad concentration to core. Slight resolution at edges and three brighter field stars are off the NW, west and SW sides. Observed at 14° elevation from Baja.

400/500mm - 18" (7/9/02 - Magellan Observatory, Australia): at 171x this globular appeared fairly bright, moderately large, ~4' diameter with a broad concentration and a fairly symmetric appearance. It was resolved into a couple of dozen faint stars, mostly in the halo, which appeared a bit ragged. The central core was very mottled but unresolved. A few brighter mag 11 stars are just outside the halo, but these appeared to be foreground stars. A mag 7.5 star is 13' NW and mag 7.0 star 15' NNE. Located 2.8° SE of mag 3.7 Theta Arae at a distance of ~45,000 light years in the inner halo.

Notes by Steve Gottlieb