TCP J09370380+1657350: AL Com 2015 outburst-like event? This 2025 outburst of TCP J09370380+1657350 has also been detected in ASASSN and ATLAS for the last ~10 days. https://asas-sn.osu.edu/sky-patrol/coordinate/f03fb5ac-6b51-49d7-9d11-d8c783... https://fallingstar-data.com/forcedphot/queue/3415376/ The outburst maximum of ~15.7 mag is somewhat fainter than that of its 2021 superoutburst (13.5 mag at max) according to the VSX. With the short outburst cycle of ~4 years, it reminds the 2015 superoutburst of AL Com, which is also characterized by the ~1.5-year outburst cycle and 2-mag fainter outburst maximum. https://ui.adsabs.harvard.edu/abs/2016PASJ...68L...2K/abstract Best regards, Yusuke 2025年11月19日(水) 7:16 Kojiguchi <kojiguchi@kusastro.kyoto-u.ac.jp>:

TCP J09370380+1657350: possible new superoutburst

Gavin Ramsay reported that GOTO detected TCP J09370380+1657350 in outburst on 2025 Nov 18 03:41:50 UT (20251118.1534). Reported magnitude: L = 16.18 (400–700 nm).

This object was previously identified as a WZ Sge-type system. For reference, see also the past report: [vsnet-alert 25216] TCP J09370380+1657350: new WZ Sge-type dwarf nova [vsnet-alert 25218] Spectrum of TCP J09370380+1657350 http://www.astronomerstelegram.org/?read=14309

https://vsx.aavso.org/index.php?view=detail.top&oid=2215274

-- ---------------------------------------------- South African Astronomical Observatory, Postdoc fellow Yusuke TAMPO / 反保 雄介 EMAIL: tampo@kusastro.kyoto-u.ac.jp ALT. EMAIL: yusuke@saao.ac.za ----------------------------------------------