AstroNote 2026-214

SN 2026sqfwas first discovered by Patrick Wiggins on July 8, 2026 (https://www.wis-tns.org/object/2026sqf/discovery-cert) using a 0.35-m refractor near Erda, Utah, USA. It was classified as a Type II supernova based on the presence of Hydrogen Balmer lines in the optical spectrum. The host galaxy is NGC 3310 at z = 0.00331, corresponding to a Hubble distance of = 14.7 Mpc (H₀ = 67.4 km/s/Mpc).

BHTOM follow-up began on the night of discovery, and follow-up observations are ongoing. The rising phase has been covered by the Seestar S50, the 60-cm Adıyaman telescope (Turkey), the 36-cm Andromeda Observatory (Belgium), the 60-cm Salerno Observatory telescope (Italy), and the 70-cm Planetarium Śląskie telescope (Poland), in the U, B, V, g, R, I bands. All photometry was transformed to the Gaia Synthetic Photometry (GaiaSP) system for internal consistency across the BHTOM network. Detailed light curves and associated statistics of SN 2026sqf are presented on the webpage: https://bhtom.space/public/targets/SN 2026sqf.

Data accessed through the BHTOM networkis subject to its Terms and Conditions available here. Public links to the light curves are provided here in the spirit of open science and collaborative research; full downloads are available to registered users upon creating a free account at BHTOM.

We share these resources because we believe in free data accessibility and the value of broad scientific collaboration. In return, we kindly ask that researchers who find these light curves useful to properly acknowledge the BHTOM project. Proper credit is essential to sustaining the collaborative spirit that makes this data possible.

Researchers planning to use these data are warmly encouraged to reach out to the BHTOM team in advance at contact@bhtom.space.

Acknowledgements: BHTOM.space is based on the open-source TOM Toolkit by LCO and has been supported by the European Union's research and innovation programmes under grant agreements No 101004719 (OPTICON-RadioNet Pilot, ORP) and 101131928 (ACME).