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SN 2017ahn is a Type II supernova, and we have a rare opportunity to observe it so soon after its discovery. This is a totally new way to learn more than we ever knew before about exploding stars.
The explosion happened about 123 million light years away in the spiral galaxy NGC 3318, which previously hosted a supernova, discovered in 2000. It was discovered February 8, 2017, less than a day after it exploded, by the DLT40 survey of nearby galaxies, run by astronomers at Texas Tech University and the University of California, Davis. It was classified by the supernova group at Las Cumbres Observatory about 11 hours later.
Because this supernova was discovered and classified so young, we will be able to watch its rapid evolution over the first few days and weeks. Getting images now will help us determine the size, mass, and structure of the star that exploded