Visibility III / V
On March 25, 2021, I photographed the AT2021gmj supernova from the small NGC3310 galaxy in the constellation Big Bear. Wikipedia provides basic information about that 3′.1 × 2′.4 dimmed “starburst” galaxy, but it is better to link this observation to the observation of the Virtual Telescope website: https://www.virtualtelescope.eu/2021/03/20/supernova -candidate-at-2021gmj-in-ngc-3310-Galaxy-an-image-20-mar-2021 /
I turned the full-resolution image into a vertical position so that it was in the same direction as that model image. The second image is a grid-sized image in which I have left a 100% crop of that galaxy in the corner of the image area. The image is a 30: 20: 20: 20 min LRGB image, which means that the total exposure is 90 minutes with my 6 "lens tube.