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.
All the data I have all put together to give this image of the Witch’s Broom nebula.
This image of the Veil nebula in Cygnus incorporates all the data I have on the object. So this image includes Hyperstar III on the C11 data, Sky90 (2-frame mosaic including narrowband) data, and the Canon 200mm lenses with the Optolong-Pro filter data. In total this will be in excess of 40-hours exposure time. If I can get it, I will add more Canon 200mm lens data as and when.
Got today’s EPOD – https://epod.usra.edu/ – with the recent Sadr and the Butterfly Nebula – taken with the Canon 200mm prime lenses and the ZWO ASI 2600 MC-Pro CMOS cameras. Thank you Jim for continuing to publish my work.
My usual filter on the Hyperstar 4, on a C11, with an ASI 2600MC Pro CMOS camera, is a simple UV/IR cut filter. And this does the job admirably. But in my Bortle 4.5 zone I would like to filter out some of the background rubbish and get even more performance out of the Hyperstar.
To this end, I have tried an Optolong L-Enhance filter which filters in the H-alpha and OIII and filters out the rest. Doesn’t seem to help the Hyperstar much as far as I can see, which just means the filter is not good at f#2. Not too surprising really, and pretty much as expected. However, I switched it over to the Canon 200mm prime lenses where it would provide an f#4.2 aperture – and the results are superb. Win some lose some.
Just seen that Starizona also sent me an Optolong L-Extreme filter as well. As I haven’t tried this out on the Hyperstar yet, I just fitted it this morning. I will do a test run on an object where I already have plenty of UV/IR cut filter data to compare it with (probably the Pelican nebula) and I will get back to you with the results. I am expecting that, once again, the results are inferior to a plain UV/IR cut filter, but you never know.