(https://cdn.astrobin.com/thumbs/CAHX3LEKhG_A_1824x0_HdHQ5gSi.jpg)
This is a Bortle 7 image of M33. In Sky Safari it is called The Pinwheel Galaxy (but I thought that that applied to another object?) also known, for obvious reasons as The Triangulum Galaxy.
On Astrobin the image is plate solved: Link to Astrobin page (https://cdn.astrobin.com/thumbs/CAHX3LEKhG_A_1824x0_HdHQ5gSi.jpg)
I imaged it on 23rd and 30th January and 1st February - when I checked the subframes I discovered that it was disappearing behind the wall of my observatory and I lost a lot of them.
My normal setup was used:
Sharpstar 15028 HNT (150mm f2.8) Image scale ~ 1.87 arc" per pixel - the image is slightly cropped to remove vignetting in the corners.
Camera: ZWO ASI1600MM Pro (at -10C)
Mount iOptron CEM 25P
ASIAir Pro, ZWO Filter wheel and ZWO Electronic Automated Focuser.
Sub-exposures used (more than I thought):
HaO: 300 sec x 25
R: 120 sec x 33
G: 60 sec x 60
B: 60 sec x 33 and 75 sec x 10
Ha: 240 sec x 38
Astrobin says this amounts to 7 hrs 28 mins and 30 secs in total and the average Moon phase was 15.68%
Processing: Pixinsight, Affinity Photo 2 and GraXpert.
Regards to all,
John
AS I said on Whatsapp, that's a fine result from Bromley. It is probably lacking in whatever the Luminancce would bring, but as we both know Lum is not practical from Bromley.