23 May
2025
23 May
'25
8:11 a.m.
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. https://www.aavso.org/vsx/index.php?view=detail.top&oid=10848624
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
MAIL: tampo@kusastro.kyoto-u.ac.jp
MAIL: yusuke@saao.ac.za
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