Another supernova joins my collection, this time a type II, which was detected on April 11, 2024.
The galaxy NGC 3621, in which it appeared, is a barred spiral galaxy, located about 22 million light-years away from us. The galaxy has a diameter of approximately 93,000 light-years (29,000 pc) and is tilted at an angle of 66° relative to the Earth observer. It was discovered on February 17, 1790, by William Herschel. Its active nucleus corresponds to the optical spectrum of Seyfert galaxies. The only problem with this object is that it is located in the constellation Hydra, making it practically unobservable for an observer from Poland (at the latitude of Krakow, it reaches a maximum of 7 degrees above the horizon).
Grzesiek Duszanowicz came to the rescue, as he has the "Moonbase South Observatory" in Namibia.
The observed supernova, the first in this galaxy, is designated SN 2024ggi. It shows similarities to SN2023ixf, which was discovered last year (
https://astropolis.pl/topic/89330-m-101-supernowa-2023ixf-fotografia-kr%C3%B3tkoczasowa-oraz-spektroskopowe-potwierdzenie-klasy-ii/). Supernovae of this type form after exhausting their fuel and the violent collapse of their core.
The exposure times were as follows - for the galaxy: L: 60x60 sec; R, G, B each 60x60 sec; and for the spectrum collected with the Sa 200 filter: 41x45 sec.
The material - both the photography and the galaxy spectrum - was collected at Hakos using a Celestron C14 telescope (reduced to F/7.3) and an ASI 294MM Pro camera. The equipment in the observatory is used for specific purposes, which include detecting NEOs and comets. Therefore, I worked with 4x4 binning, and the stars came out as they did.
I analyzed the spectrum in RSpec and compared it with a reference obtained from
https://www.wis-tns.org/object/2024ggi
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