The open cluster in the centre is NGC1817 in the constellation Taurus. This is 12 x 20-minute subs using the 3 x Sky90s and 3 x M26C OSC CCDs on the MiniWASP array at the New Forest Observatory.
I just took a close look at the old Merak 4-framer taken with the Sky90/M26C OSC CCD array, and I couldn’t believe the number of satellite trails and colour blotches that I had left in there. So I got rid of them and this is the result.
This is a very deep image of the Pleiades (M45) in Taurus. This comprises 27 x 40-minute subs (18-hours) on the Sky90 array with M26C OSC CCDs.
I made a typo on the original, so here’s the typo fixed:
This single-frame Sky90/M26C OSC CCD image contains a lot of interesting bits and pieces. The data comprises 8-hours and 10-minutes of 10-minute subs with a UV/IR cut filter.
The bright orange/yellow star lying on the centre line about 1/3rd of the way down from the top is 32 Cygni. 32 Cygni is magnitude 4.2 (visible to the naked eye) and is spectral type K31b-II comp.
Move to the left, and slightly above 32 Cygni, and you will come to the first of two Carbon stars in this image. This Carbon star which adds its beauty to the wispy emission nebula that surrounds it, is SAO49477 or U Cygni. U Cygni is a Carbon star of spectral type Cme and magnitude 8.25. U Cygni sits right next to star SAO49479 of spectral type G0 and magnitude 7.87.
Move to the right, and slightly above 32 Cygni, and you come to the second Carbon star in the image SV Cygni, spectral type R3v and magnitude 8.65. SV Cygni is also designated HIP99310 and also GSC 3563:462.
Another complete reprocess. This time it is the Heart nebula, captured on the Sky90/M26C MiniWASP array. A two frame mosaic totalling 39 x 20-minute subs (13 hours).
A complete reprocess of Sky90/M26C MiniWASP data for Y Tauri. This is 30 x 10-minute subs.
39-Delta Persei (SAO39053) is a VERY blue star as you can see. Spectral type B5III SB. This is 72 x 450-second subs (9 hours) on the Sky90 array using the M26C OSC CCDs.
This is all the data I have from the HSIII and 814C plus the Sky90s and M26Cs. This will be in excess of 8-hours of data.
As mentioned earlier, I did try the Optolong L-Extreme filter out on the Hyperstar 4 (on the Gamma Cass nebula) and the result was – no improvement as far as I could see. So as expected, these filters are not suitable at f#2 (no real surprise there) and for an OSC camera you really need to stick with just a UV/IR cut filter for the best results.