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Part of the Pleiades star cluster, M45, in Taurus, with stars (clockwise from bottom right Maia, Asterope and Taygeta.  Some blue nebulosity is visible around the bright stars, caused by gas and dust reflecting starlight.
 

Image info

Telescope:  Skywatcher 8" f/5 Newtonian

Focus:  Prime focus

Camera:  SAC7B, uncooled

Exposure:  various, 27 to 48 x 20s, mosaic of 4 images 

Date:  2nd Nov 2002

Processing:  Acquired in Astrovideo as FITS.  Stacked and mosaicked in Iris. 

Comments

In this case the uneven sky background and nebulosity made good mosaicking difficult.  The joins between the 4 different images are visible.
   
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