NGC 6960: the Cirrus Nebula in Cygnus.

The dispersing remnant of a very old supernova, the Veil now extends 2 degrees in the sky. A small but relatively dense part of it is called the "Cirrus".

Images taken: Oct. 9, 11 and 14, 2007, by Leah Nodar and Ricki Harrell.

Telescope: Meade 12 in at f/5.7 (f=68 in).

Camera: SBIG ST-10 CCD camera

Original pixel size: 0.78 as/pix, resampled to 2 as/pix.

A mosaic of three panels, total size 26 am x 50 am. North is to the right.

Exposures: Each panel: 15 min H-alpha (shown red), 20 min [OIII] 500 nm (shown blue), and 30 min [SII] 680 nm (shown green). On each panel an additional set of 2 min red, green, blue (each) exposure was taken and superimposed. The stars are bright in these, so the approximate their true color. Total light: 4 hours.

Image processing: CCDoops + CCDSoft + CCDSharp + Photoshop CS.