SN 2025rbs is a Type Ia supernova (a binary system) discovered on July 14, 2025, in the spiral galaxy NGC 7331, in the constellation Pegasus, at a distance of approximately 45 million light-years from Earth.
The photo was taken on August 8 at 23:15 local time (21:15 UT) and it is the sum of 95 one-minute exposures.
Unfortunately, the full Moon, at an angular distance of 60° from the galaxy, disturbed the images.
Furthermore, some stars exhibit an asymmetric halo, perhaps due to imperfect collimation of the telescope.
The supernova is, however, visible very close to the nucleus of NGC 7331.
For comparison, the last photo was taken by me on August 3, 2022, with a total exposure of 24 minutes (187 eight-second exposures), and the supernova is not present.
The difference in quality between the two photos is also evident: the 2025 photo was taken using PHD2 for tracking, a light pollution filter (Optolong L-Quad Enhance Filter) and a much more accurate photo processing, while the 2022 photo was taken with the short exposure technique (without tracking), without filters and without using the dithering technique, which I was not yet aware of, so there is an annoying rain noise in the background.
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