Globular Cluster M71 (NGC 6838), class X-XI, in Sagitta.

RA 19:53.8 (h:m); DEC +18:47 (deg:m); Distance 13.000 light years
Visual Brightness 8.2 (mag); Apparent Dimension 7.2 (arc min)

This globular cluster is easy to find and nicely observable even in good binoculars, by locating the 6th-mag star 9 Sagittae half-way between Gamma and Delta of that constellation. Medium-sized amateur telescopes are required to resolve this compressed mass of stars, but then even the center is resolved. The cluster is brighter and sharply terminated on the western side, forming a "curving V", as John Mallas describes it.

Source and more: SEDS


August 6, 2009 20:35 - 21:22 UT.
Imaging: William Optics Zenithstar 80 ED II APO, f/6.8 [focal length 545 mm], Astronomik LRGB filters; ATK16IC camera.
Exposures: L: 11x150s [1x1]; RGB: 5x70s [2x2], unguided.

July 31, 2003 23:23 - 23:31 UT.
Imaging: TAL-2M 15 cm f/8 @ f/4.6, Vesta Pro-SC3.2a b/w, Baader Infra Red Blocking filter, 24x15 seconds exposure, unguided.