Object name: NGC7243

Designation(s): NGC7243,

NGC 7243 is an elongated cluster of rather bright blue stars in Lacerta. It was discovered by William Herschel on September 26, 1788. It is in the original H400 program. My notes from June 14, 1985 on a fair but humid night with my 10\" f/5 at 60x reads: \"Large scattered cluster in two parts as it seems cut by a dark lane. This seemed to fade away when the cluster was partly obscured by a thin cloud. Visually, to me, it is more a star cloud than a true cluster.\" I think I see the dark lane I referred to.

There\'s only one galaxy in the image with redshift data. It is in the lower right corner and is LEDA 167750 at a redshift distance of about 580 million light-years. The much closer star cluster is about 2600 light-years distant per WEBDA. They give its age at 114 million years. While reddened slightly at 0.22 magnitude its very young age makes most of its brighter stars coming out very blue even with the smoke this was imaged through.

I needed something big and bright to make processing easier for a change, this is it. Not very interesting but is an original H400 object, one of the few I\'ve left to capture that are far enough north for my latitude and observatory wall.

14\" LX200R @ f/10, L=4x10\' RGB=2x10\', STL-11000XM, Paramount ME