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September 2026

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[vsnet-alert 28228] ASASSN-26fa: new SU UMa-type dwarf nova, possibly WZ Sge-type
by Hiromasa Hoke 14 Sep '26

14 Sep '26

ASASSN-26fa: new SU UMa-type dwarf nova, possibly WZ Sge-type ASASSN reported the discovery of ASASSN-26fa at 14.63 mag on 2026-08-31.18 UT. According to vsx, this object's quiescence mag is at g=~23 https://vsx.aavso.org/index.php?view=detail.top&oid=10876034 Sjoerd Dufoer and Moriyama-san reported time-resolved observation. The light curve shows clear ordinary superhumps with a period of 0.0636(8) d and an amplitude of 0.3 mag. Thus ASASSN-26fa is a new SU UMa-type dwarf nova. Given its short superhump period and large outburst amplitude, this is a good candidate for a WZ Sge-type dwarf nova. Follow-up observations are encouraged. Best regards, Hiromasa Hoke

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[vsnet-alert 28213] TCP J18030904+1218140= ZTF18absdcuk: large-amplitude CV outburst, possibly AM CVn-type?
by Yusuke Tampo 03 Sep '26

03 Sep '26

TCP J18030904+1218140= ZTF18absdcuk: large-amplitude CV outburst, possibly AM CVn-type? TCP J18030904+1218140 was discovered by Yuji Nakamura on 2026-08-19.5199 UT at 14.9 mag. Its previous outburst and log decline in 2018 were detected as ZTF18absdcuk. The VSX lists the r=21.1 mag star as the quiescent counterpart; thus the outburst amplitude is ~6 mag. https://alerce.online/object/ZTF18absdcuk https://vsx.aavso.org/index.php?view=detail.top&oid=10875986 Sano-san has reported the time-resolved observations for ~1.5 hours on 2026-08-20 UT. The light curve shows possible modulations with a period of 0.0288 d (41.5 min) with a double-peaked profile (early superhumps?). The optical spectrum obtained by the SAAO Lesedi telescope on 2026-08-19 UT shows a blue continuum with no prominent emission or absorption lines. Time-resolved photometry is strongly encouraged to confirm the periodicity and determine whether this is an AM CVn star or not. Best regards, Yusuke -- ---------------------------------------------- Yusuke TAMPO / 反保雄介 Postdoc fellow South African Astronomical Observatory / University of Cape Town EMAIL: tampo(a)kusastro.kyoto-u.ac.jp ALT. EMAIL: yusuke(a)saao.ac.za ----------------------------------------------

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