Since I [shot M61 back in March](
https://www.reddit.com/r/astrophotography/comments/g3c2ph/m61_the_swelling_spiral_galaxy/) before the supernova appeared, I decided to get a quick pic of it last night in order to compare the before and after of the supernova. I opted to stack only 5 frames of my March data in order to have similar SNRs between the images. The data from March was taken through a CLS filter and was in heavier light pollution (Bortle 7, compared to Bortle 6 for the May data) the the SNR is clearly lower despite the same amount of exposure time.
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**[Equipment:](
https://i.imgur.com/BYyK1wu.jpg)**
> TPO 6" F/4 Imaging Newtonian
> Orion Sirius EQ-G
> ZWO ASI1600MM-Pro
> Skywatcher Quattro Coma Corrector
> ZWO EFW 8x1.25"/31mm
> Astronomik LRGB+CLS Filters- 31mm
> Astrodon 31mm Ha 5nm, Oiii 3nm, Sii 5nm
> Agena 50mm Deluxe Straight-Through Guide Scope
> ZWO ASI-120MC for guiding
> Moonlite Autofocuser
**Acquisition:** 20 minutes total
> March - 5x120" CLS
> May - 5x120" Lum
> Darks- 30
> Flats- 30 per filter
**Capture Software:**
> Captured using [N.I.N.A.](
https://nighttime-imaging.eu/), EQMod for mount control, and PHD2 for guiding and dithering.
**PixInsight Processing:**
> [Blink](
https://youtu.be/sJeuWZNWImE?t=40)
> BatchPreProcessing
> ImageIntegration
> DynamicCrop
> DynamicBackgroundExtraction
> STF applied via HistogramTransformation
> Annotated in Photoshop
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