John Herschel discovered NGC 5764 = h3582 on 8 Jul 1834 and recorded "a small elongated close group of vS milky way stars; 3' l, 1 1/2' br; so close and faint as to approach very near to the character of a nebula." His single position is at the east end of the small group.

300/350mm - 14" (4/3/16 - Coonabarabran, 178x): NGC 5764 is a very small, faint elongated glow, ~1' length, with a half-dozen mag 13-15 stars resolved in a tight clump. A mag 13 star (close double) is off the east end and the brightest star in the elongated clump is a very close double. Several additional very faint stars are within a 2' x 1' region (nominal size of the cluster). Located 26' NW of mag 5.4 HD 131562.

Notes by Steve Gottlieb