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NGC 869 & NCG 884 The Double Cluster in Perseus
These open star clusters lie at a distance of 7500 light years
Imaged using Skywatcher Equinox 80 Pro ED and Altair Hypercam 183C Pro
A total of 20 x 120 second and 30 x 300 second exposures
The double cluster up and close. This is almost as it's framed by my camera. Only stacking edges were trimmed.
Imaged during a full moon on December 4.
Scope: SW 150PDS (750 mm fl) on a SW AZ EQ6, unguided
Camera: ZWO ASI174MM-cool at -30 C and gain = 0
R: 55 x 30 s G: 54 x 30 s B: 62 x 30 s (Total integration time: 85 minutes)
Processed in PixInsight.
The Double Cluster consists mostly of blue-white super giant stars. The older red stars looked unnatural when I tried to use more colour saturation, so I kept processing to a minimum. No star reduction, but deconvolution to make the stars "pop" a little more.
(click to enlarge)
I took these images on Sat 25th Nov from here in W Oxfordshire. I've got the widefield setup running now using a RPi3 running KStars and Ekos. This controls a modded, uncooled 350d (with Baader filter) and a serial shutter cable, an Arduino motor focuser (as a Moonlite compatible focuser) and the Losmandy GM8 it all sits on.
Images were taken through a Canon 85mm f1.8 EF lens at f4.5, exposures were 45 x 300sec (3h45m total) at ISO400 through an IDAS P2 filter. The field is a whisker over 15x10 degrees. Processing was in PixInsight and a bit of work in Photoshop to reduce a bit of amp glow that didn't calibrate out fully.
Fairly pleased with this (though the Heart and Soul have come out maybe a little red - the colour calibration uses PI's PCC tool, and the IDAS filter might throw it a bit), but there's some other areas of interest coming through in the image. Annotated image attached but there are a few other bits that PI doesn't grab - there's a small area of reflection nebula (LBN 142.14+01.97) to the left of Sh2-202 that's just coming through. Also, unlabelled are Stock 2 (between the Heart and the Double Cluster) and for the interested clouded out astronomer, galaxies Maffei 1 and 2 are visible in frame just below the Heart (labelled as Sh2-191 and Sh2-197).
Thanks for taking a look!