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I wasn’t sure if this one would come out as there was some serious gradients in it. I’m running a trial of PixInsight and it’s the Auto Background Extraction I’ve used to get rid of them. Sometimes there is a column defect in the QHY8 which I will need to try and process out.

The Pleiades, or Seven Sisters, (Messier object 45) is an open star cluster containing relatively young hot B-type stars located in the constellation of Taurus. It is among the nearest star clusters to Earth and is the cluster most obvious to the naked eye in the night sky. Pleiades has several meanings in different cultures and traditions. The cluster is dominated by hot blue and extremely luminous stars that have formed within the last 100 million years. Dust that forms a faint reflection nebulosity around the brightest stars was thought at first to be left over from the formation of the cluster (hence the alternate name Maia Nebula after the star Maia), but is now known to be an unrelated dust cloud in the interstellar medium that the stars are currently passing through. Astronomers estimate that the cluster will survive for about another 250 million years, after which it will disperse due to gravitational interactions with its galactic neighborhood.

Camera: QHY8 with Hutech IDAS LPS2 Filter
Scope: Skywatcher Equinox 80 with Televue TRF-2008
Mount: EQ6 with EQMOD
Guiding: Orion ST80 with QHY5
Capture Software: CCD Commander, The Sky, Maxim DL
Processing Software: DSS, PixInsight, Photoshop, Noise Ninja, Starspikes Pro
Exposures: 10 x 600 secs (1 Hour 40 Mins)
Calibration: 100 x Bias, 50 x Flats

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