This AM CVn star is ~16 mag now. Last night, this object was faint. So, this object is undergoing the next rebrightening. The typical duration of the rebrightening is about 1-2 days. Follow-up observations during the bright state and continuous monitoring are encouraged. On 2026/06/10 1:47, Josch Hambsch via vsnet-alert wrote:
Last night the target star reached mag 15.8 CV and I have switched to time series again from tonight onwards. Hopefully weather will cooperate.
Regards,
Josch
Am 09.06.2026 um 13:20 schrieb Hiromasa Hoke via vsnet-alert:
Itoh-san, Funada-san, Sano-san, Kubotera-san, Kirill Sokolovsky, Magnus Larsson, and Josch Hambsch have newly reported the observations. This object has finished its superoutburst. However, AM CVn-type dwarf novae characteristically show rebrigtening before reaching quiescence. Since it is uncertain when this object will re-bright, continuous observation is very important.
Further continuous observations are strongly encouraged. Snapshots are also very welcome.
best regard, Hiromasa Hoke
On 2026/05/25 9:56, Hiromasa Hoke via vsnet-alert wrote:
TCPJ15030519+2202041: is still in quiescent interval before the second superoutburst
Magnus Larsson, and Josch Hambsch have newly reported their observations. According to the data, this object is still in quiescent interval before the second superoutburst. AM CVn-type dwarf novae show the second outburst after an interval of several to more than ten days. Continued observations are encouraged to catch the onset of the second superoutburst. Thus, further snapshots are very welcome.
best regard, Hiromasa Hoke
On 2026/05/21 17:02, Hiromasa Hoke via vsnet-alert wrote:
TCPJ15030519+2202041: is still in quiescent interval before the second superoutburst
Itoh-san, Moriyama-san, Hiraga-san, Funada-san, Magnus Larsson, and Josch Hambsch have newly reported their observations. According to the data, this object is still in quiescent interval before the second superoutburst. The current magnitude is 19~20. AM CVn-type dwarf novae show the second outburst after an interval of several to more than ten days. Continued observations are encouraged to catch the onset of the second superoutburst.
best regard, Hiromasa Hoke
On 2026/05/16 18:43, Hiromasa Hoke via vsnet-alert wrote:
TCPJ15030519+2202041: shows early superhump and rapid decay now
Itoh-san, Moriyama-san, Hiraga-san, Funada-san, Magnus Larsson, and Josch Hambsch have newly reported their observations. According to the data, this object showed an early superhump with an amplitude of 0.03. Furthermore, this object has a superhump period of 0.03041(1). Now, this object shows rapid fading since May 15. AM CVn-type dwarf novae show the second outburst after an interval of several to more than ten days. This is a perfect opportunity to observe the growing superhump, so it is very important to observe this object even if it gets faint.
best regard, Hiromasa Hoke