A Type Ia supernova discovered in the grand-design spiral galaxy M100 in Coma Berenices.
SN 2025abc was detected independently at Anysllum on March 7, 2025 during routine monitoring of nearby galaxies, two days after its initial discovery by K. Itagaki. Photometric follow-up in BVRI bands over the subsequent three weeks captured the rise to peak brightness at magnitude 12.8, consistent with a standard Type Ia light curve. The supernova is located in the outer spiral arm of M100, well separated from the bright nucleus, making it an excellent target for photometric monitoring from our site.
Technical Details
Host Galaxy NGC 4321 (M100)
SN Type Type Ia
Peak Magnitude 12.8
Discovery Date 5 Mar 2025
R.A. 12h 22m 55.1s
Dec. +15d 49m 18s
Redshift 0.00524
Discoverer K. Itagaki
Offset 42 arcsec W, 18 arcsec N of nucleus