ASASSN-25bu: new SU UMa-type dwarf nova
ASASSN-25b was discovered by ASAS-SN on 2025-05-12.06. The outburst amplitude is ~8.3 mag according to the VSX. This object is currently ~17.5 mag.
Josch Hambsch and the SAAO team have reported the time-seeries observations of ASASSN-25bu. Lesedi/Mookodi observations on 22 May showed probable superhumps with a period of ~0.0574 d and an amplitude of ~0.15 mag.Thus ASASSN-25bu is a new SU UMa-type dwarf nova. Considering its short superhump period, large outburst amplitude, and no previous outbursts, ASASSN-25bu might be a WZ Sge-type.
Best regards,
Yusuke
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South African Astronomical Observatory, Postdoc fellow
反保 雄介 Yusuke TAMPO
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