SN 2025qpk: A Photometric and Spectroscopic Case for Type II-P Reclassification

Studying supernovae provides numerous insights into the nature of the universe, revealing distances to galaxies and the way that heavy elements first formed. On July 7th, 2025, supernova (SN) 2025qpk was discovered in the galaxy UGC 11622, and later classified as a Type Ia supernova. Our team utilized photometry and spectroscopy techniques to gather data on SN 2025qpk. Over 13 days, we performed Sloan g and r imaging of SN 2025qpk a total of 7 times. We collected images in-person using a 0.4-meter f/8.9 reflector telescope at the Leitner Family Observatory and Planetarium at Yale University. We also collected imaging remotely with the 0.61-meter f/6.5 reflector telescope at the Sierra Remote Observatory in Auberry, California. Our data was test-fit with models of various SN types, and found the Type II-P model to fit best, with a χ2 value of 2.9307. This evidence counters 2025qpk’s previous classification of Type Ia. Our spectroscopy shows hints of absorption typical of a Type II-P supernova, providing further evidence for our reclassification. Our findings provide a case for further analysis of SN 2025qpk, whose classification and characteristics remain intriguing.