M109 again, with the C11. With the ASI183mm

This is such a nice galaxy! Spiral arms and a central bar, beautiful! After the attempt to image it th elast nights with the C11 & Nikon, again a few nights (nights are short!!) now with the ASI183mm.

Th epixels are a bit small, and the C11 ‘s output is oversampled. In that respect the Nikon’s larger pixels (5µ) make more sense. However, this really worked out more acceptable then the previous attempts.

Using SIMBAD, you can identify some of the smallest and faintest patches in this image. SDSS J115703.88+532414.6 was about the faintest one with a listed green band magnitude of 20,893! The image itself measure 20′ x13′ end has a resolution of 0,6″ per pixel. Seeing was rather bad these nights, with nortwest sea air blowing over. Very clear however, with SQM 20,40 on average.

The C11 was guided with a 8×50 finderscope, using an ASI290MM. Autofocus was done using an Esatto 2″ focuser.

M109 3,8 hours LRGB C11 ASI183 Meldert May 2020
Searching the limiting magnitude
Astrometry from nova.astrometry.net

M109, C11 @ F7.2 & Nikon D750

M109 is located very very close to Phecda, one of the stars in Ursa Major’s bowl. In fact the star caused reflections in this image. About 4 hours of data, 115x 120″ on ISO800. Guiding was done through OAG. Manual focus corrections.

The images were obtained using Sequence Generator Pro, and saved in TIF. This creates B/W images. To get your color back they need to be debayered. This can be done in AstroPixelProcessor by checking “Force CFA” in the menu 0/RAW/FITS

M109: an image, despite all issues

An image of the surprisingly nice galaxy M109, located near Phecda, one of the bright stars of the Ursa Major’s bowl. Imaging was done with the C11, using the Starizona F 7.2 reducer, and the Nikon D750. Unfortunately, the image format setting in SGP was set to “FITS”. That resulted in strange, Black/White images with lots of problems! I could salvage the 27×300″ images a bit but the end result is a bit disappointing, it’s not a color version to start with. ..