Widefield image of Markanian's chain including galaxy NGC 4216 and it's supernova SN 2024gy and a somewhat rare deep blue star named Feige 60

January 9th, the night this image was taken, was the first completely clear night after 4 months of only clouds and rain; we experienced the wettest and warmest year since the start of measurements in 1906. https://nos.nl/collectie/13871/artikel/2503101-knmi-2023-natste-en-warmste-jaar-sinds-begin-metingen (use e.g. Chrome translate function)
So I made the best of this night and imaged 24 targets (often with multiple objects) in 12 hours time to fill my Messier list (it will take probably a year to process all data ...). So each target did get 30 minutes of exposure time on average.
Luckily my Pentax K1 with the Samyang 135 mm f/2.0 lens gobbles up photons. After that night I was completely wasted. Longer exposure times are on my wish list but with climate change clear nights are a rarity.

The Samyang 135 mm provides us with such a widefield that I accidently discovered that I exposed a recently discovered supernova: SN 2024gy
Next to this, something else stood out: a very blue star (top center). After some research I found out that this star is called Feige 60 (If I can't update the picture, it is mistakenly called Feige 90 in the annotation).
Feige 60 is located here: 12 18 58.0731740352 +15 07 27.011305092  and is listed in Simbad. It is a Blue Horizontal-Branch (BHB) star, probably very old, past it's red giant state.  It probably has low metallicity (ref https://iopscience.iop.org/article/10.1088/0004-6256/135/2/564)

Pentax K1, Astrotracer
Samyang 135 mm f/2.0
66 lights, 20 sec, ISO 1600, repoint camera every 10 minutes
10 darks
3 flats
30 dark offset / bias
No filters, camera not modified
Bortle 6-7

SW used:
DSS
Photoshop
Starnet++

Photoshop:
- Stretch place RGB histograms on top of each other
- Vignet reduction via Camera Raw
- Stretch place RGB histograms on top of each other
- Curve adjustment
Starnet++:
- Remove stars
Photoshop on starless image:
- High Frequency filter 2x, merge with "overlay"
- Camera Raw blur and sharpen
- Remove background
- Adjust brightness and contrast
- Add stars
- Camera raw blur, brightness, contrast
- Crop
- Vignet reduction
- Adjust brightness/contrast and color/saturation
- Texts