This is a picture of NGC 6811 Hole-In-A-Cluster. This is an open star cluster found in the Cygnus constellation. NGC 6811 is made up of many stars that are spread across a large space, unlike a globular cluster where they would be a lot closer together. The cluster is approximately 700 million years old and contains both red giants and hot blue stars. The cluster is about 1215 parsecs away from earth. NGC 6811 was discovered by John Herschel in 1829.
NGC 6811 has both red stars and blue stars which means that this cluster is young. The brightest stars in this cluster are mostly blue stars with only a couple of red stars which tells me that this cluster is young compared to others. This cluster made up of about 70 bright stars which stick out in the cluster. The linear diameter of the image is approximately 16 light years by 24 light years.
Ayiomamitis, Anthony. "NGC 6811 - open cluster in Cygnus." Astronomy. 26 July 2010. Web. 6 Dec. 2010. <http://cs.astronomy.com/asycs/media/p/450560.aspx>.
Lindoff, U. "WEBDA page for open cluster NGC 6811." WEBDA . May 2009. Web. 6 Dec. 2010. <http://www.univie.ac.at/webda/cgi-bin/ocl_page.cgi?dirname=ngc6811>.
|Right Ascension (J2000)||19:38:12|
|Filters used||blue(B), green(V), red(R), and clear(C)|
|Exposure time per filter||6x60 seconds in C, 300 seconds in BVR|
28, 2010 (C)