IC 4665

Right Ascension	17 : 46.3 (h:m)
Declination	+05 : 43 (deg:m)
Distance	1.4 (kly)
Visual Brightness	4.2 (mag)
Apparent Dimension	70 (arc min)

IC 4665 is a very conspicuous, coarse star cluster in the opera glas, but difficult to detect in the telescope so that neither Messier nor one of the Herschels found it. The Sky Catalogue 2000.0 gives 30 member stars, the brightest of which is of 6.86 magnitude, a Trumpler type of III 2 p, and an estimated age of 36 million years. At a distance of 1,400 light years, IC 4665 is approaching us at 12 km/sec.

IC 4665 has been discovered by the Swiss astronomer Philippe Loys de Cheseaux, according to the Webb Society Deep-Sky Observer's Handbook, Volume 3 (Open and Globular Star Clusters), p. 3.

In John Caldwell's Best Sky Objects list. In the Astronomical League's Deep Sky Binocular Club List.

Last Modification: 8 Mar 1998, 19:30 MET