[vsnet-alert 28196] TCP J02191736+2857158: growing superhump
TCP J02191736+2857158: growing superhump Moriyama-san, Stephen, Funada-san, Peter Starr and Itoh-san reported the observation. According to the data from the last three days, the object has a superhump period of ~0.048(1)d. Further observations during this phase are very important. The current magnitude is ~14mag. best regard, Kyoto University master's grade 2 Hiromasa Hoke
the object has a superhump period of ~0.048(1)d. This period of 69 min is below the period minimum. This value and the strong helium-rich spectrum, which we reported to ATel, suggest that this object is an EI Psc-type object showing a WZ Sge-type superoutburst. Such an event is very rare. Further observations are encouraged.
On 2026/07/24 20:24, Hiromasa Hoke via vsnet-alert wrote:
TCP J02191736+2857158: growing superhump
Moriyama-san, Stephen, Funada-san, Peter Starr and Itoh-san reported the observation. According to the data from the last three days, the object has a superhump period of ~0.048(1)d. Further observations during this phase are very important. The current magnitude is ~14mag.
best regard, Kyoto University master's grade 2 Hiromasa Hoke
dear all, This object was at ~16 mag around BJD 2461257.5 and is expected to have entered a rapid fading phase. However, similar objects have shown rebrightening, and a similar rebrightening is predicted for this object within the next 2–3 days. Continued follow-up observations are highly encouraged. On 2026/07/25 9:16, Keisuke Isogai via vsnet-alert wrote:
the object has a superhump period of ~0.048(1)d. This period of 69 min is below the period minimum. This value and the strong helium-rich spectrum, which we reported to ATel, suggest that this object is an EI Psc-type object showing a WZ Sge-type superoutburst. Such an event is very rare. Further observations are encouraged.
On 2026/07/24 20:24, Hiromasa Hoke via vsnet-alert wrote:
TCP J02191736+2857158: growing superhump
Moriyama-san, Stephen, Funada-san, Peter Starr and Itoh-san reported the observation. According to the data from the last three days, the object has a superhump period of ~0.048(1)d. Further observations during this phase are very important. The current magnitude is ~14mag.
best regard, Kyoto University master's grade 2 Hiromasa Hoke
TCP J02191736+2857158: rebrightening As expected, this object is now showing a rebrightening. The peak brightness should be ~15.0-14.8 mag. The rebrightening will be long-duration or multiple-type. Further observations are strongly encouraged. The observations are reported by Josch Hambsch, David Messier, Filipp Romanov, Hubert Delafay, Pavol A. Dubovsky, Moriyama-san, Sano-san, Itoh-san, and Stephen M. Brincat. On 2026/08/05 2:29, Hiromasa Hoke via vsnet-alert wrote:
dear all,
This object was at ~16 mag around BJD 2461257.5 and is expected to have entered a rapid fading phase. However, similar objects have shown rebrightening, and a similar rebrightening is predicted for this object within the next 2–3 days. Continued follow-up observations are highly encouraged.
On 2026/07/25 9:16, Keisuke Isogai via vsnet-alert wrote:
the object has a superhump period of ~0.048(1)d. This period of 69 min is below the period minimum. This value and the strong helium-rich spectrum, which we reported to ATel, suggest that this object is an EI Psc-type object showing a WZ Sge-type superoutburst. Such an event is very rare. Further observations are encouraged.
On 2026/07/24 20:24, Hiromasa Hoke via vsnet-alert wrote:
TCP J02191736+2857158: growing superhump
Moriyama-san, Stephen, Funada-san, Peter Starr and Itoh-san reported the observation. According to the data from the last three days, the object has a superhump period of ~0.048(1)d. Further observations during this phase are very important. The current magnitude is ~14mag.
best regard, Kyoto University master's grade 2 Hiromasa Hoke
TCP J02191736+2857158: long-lasting rebrightening Sano-san, Itoh-san, Moriyama-san, and Josch Hambsch reported further observations. The object has shown long-lasting (type A) rebrightening since Aug 14. The current brightness is ~ 15.0-15.5 mag. The object is still showing a weak superhump signal. Continuous time-series observations are strongly encouraged. On 2026/08/12 16:26, Keisuke Isogai via vsnet-alert wrote:
TCP J02191736+2857158: rebrightening
As expected, this object is now showing a rebrightening. The peak brightness should be ~15.0-14.8 mag. The rebrightening will be long-duration or multiple-type. Further observations are strongly encouraged. The observations are reported by Josch Hambsch, David Messier, Filipp Romanov, Hubert Delafay, Pavol A. Dubovsky, Moriyama-san, Sano-san, Itoh-san, and Stephen M. Brincat.
On 2026/08/05 2:29, Hiromasa Hoke via vsnet-alert wrote:
dear all,
This object was at ~16 mag around BJD 2461257.5 and is expected to have entered a rapid fading phase. However, similar objects have shown rebrightening, and a similar rebrightening is predicted for this object within the next 2–3 days. Continued follow-up observations are highly encouraged.
On 2026/07/25 9:16, Keisuke Isogai via vsnet-alert wrote:
the object has a superhump period of ~0.048(1)d. This period of 69 min is below the period minimum. This value and the strong helium-rich spectrum, which we reported to ATel, suggest that this object is an EI Psc-type object showing a WZ Sge-type superoutburst. Such an event is very rare. Further observations are encouraged.
On 2026/07/24 20:24, Hiromasa Hoke via vsnet-alert wrote:
TCP J02191736+2857158: growing superhump
Moriyama-san, Stephen, Funada-san, Peter Starr and Itoh-san reported the observation. According to the data from the last three days, the object has a superhump period of ~0.048(1)d. Further observations during this phase are very important. The current magnitude is ~14mag.
best regard, Kyoto University master's grade 2 Hiromasa Hoke
TCP J02191736+2857158: drop from the rebrightening outburst Moriyama-san, Itoh-san, and Sano-san have reported further observations. According to the latest ATLAS observations on 30 August, TCP J02191736+2857158 faded to o~18.3 mag, implying the end of long-lasting rebrightening. A small dip was also captured by Moriyama-san on 26 August around 16.8 mag before the end of rebrightening. Best regards, Yusuke 2026年8月25日(火) 14:19 Keisuke Isogai via vsnet-alert <vsnet-alert@ooruri.kusastro.kyoto-u.ac.jp>:
TCP J02191736+2857158: long-lasting rebrightening
Sano-san, Itoh-san, Moriyama-san, and Josch Hambsch reported further observations. The object has shown long-lasting (type A) rebrightening since Aug 14. The current brightness is ~ 15.0-15.5 mag. The object is still showing a weak superhump signal. Continuous time-series observations are strongly encouraged.
On 2026/08/12 16:26, Keisuke Isogai via vsnet-alert wrote:
TCP J02191736+2857158: rebrightening
As expected, this object is now showing a rebrightening. The peak brightness should be ~15.0-14.8 mag. The rebrightening will be long-duration or multiple-type. Further observations are strongly encouraged. The observations are reported by Josch Hambsch, David Messier, Filipp Romanov, Hubert Delafay, Pavol A. Dubovsky, Moriyama-san, Sano-san, Itoh-san, and Stephen M. Brincat.
On 2026/08/05 2:29, Hiromasa Hoke via vsnet-alert wrote:
dear all,
This object was at ~16 mag around BJD 2461257.5 and is expected to have entered a rapid fading phase. However, similar objects have shown rebrightening, and a similar rebrightening is predicted for this object within the next 2–3 days. Continued follow-up observations are highly encouraged.
On 2026/07/25 9:16, Keisuke Isogai via vsnet-alert wrote:
the object has a superhump period of ~0.048(1)d. This period of 69 min is below the period minimum. This value and the strong helium-rich spectrum, which we reported to ATel, suggest that this object is an EI Psc-type object showing a WZ Sge-type superoutburst. Such an event is very rare. Further observations are encouraged.
On 2026/07/24 20:24, Hiromasa Hoke via vsnet-alert wrote:
TCP J02191736+2857158: growing superhump
Moriyama-san, Stephen, Funada-san, Peter Starr and Itoh-san reported the observation. According to the data from the last three days, the object has a superhump period of ~0.048(1)d. Further observations during this phase are very important. The current magnitude is ~14mag.
best regard, Kyoto University master's grade 2 Hiromasa Hoke
-- ---------------------------------------------- Yusuke TAMPO / 反保 雄介 Postdoc fellow South African Astronomical Observatory / University of Cape Town EMAIL: tampo@kusastro.kyoto-u.ac.jp ALT. EMAIL: yusuke@saao.ac.za ----------------------------------------------
TCP J02191736+2857158: faded Sano-san, Moriyama-san and Itoh-san reported the observations. This object was completely faded from the rebrgithening. Further observations are not necessary. On 2026/08/25 21:17, Keisuke Isogai via vsnet-alert wrote:
TCP J02191736+2857158: long-lasting rebrightening
Sano-san, Itoh-san, Moriyama-san, and Josch Hambsch reported further observations. The object has shown long-lasting (type A) rebrightening since Aug 14. The current brightness is ~ 15.0-15.5 mag. The object is still showing a weak superhump signal. Continuous time-series observations are strongly encouraged.
On 2026/08/12 16:26, Keisuke Isogai via vsnet-alert wrote:
TCP J02191736+2857158: rebrightening
As expected, this object is now showing a rebrightening. The peak brightness should be ~15.0-14.8 mag. The rebrightening will be long-duration or multiple-type. Further observations are strongly encouraged. The observations are reported by Josch Hambsch, David Messier, Filipp Romanov, Hubert Delafay, Pavol A. Dubovsky, Moriyama-san, Sano-san, Itoh-san, and Stephen M. Brincat.
On 2026/08/05 2:29, Hiromasa Hoke via vsnet-alert wrote:
dear all,
This object was at ~16 mag around BJD 2461257.5 and is expected to have entered a rapid fading phase. However, similar objects have shown rebrightening, and a similar rebrightening is predicted for this object within the next 2–3 days. Continued follow-up observations are highly encouraged.
On 2026/07/25 9:16, Keisuke Isogai via vsnet-alert wrote:
the object has a superhump period of ~0.048(1)d. This period of 69 min is below the period minimum. This value and the strong helium-rich spectrum, which we reported to ATel, suggest that this object is an EI Psc-type object showing a WZ Sge-type superoutburst. Such an event is very rare. Further observations are encouraged.
On 2026/07/24 20:24, Hiromasa Hoke via vsnet-alert wrote:
TCP J02191736+2857158: growing superhump
Moriyama-san, Stephen, Funada-san, Peter Starr and Itoh-san reported the observation. According to the data from the last three days, the object has a superhump period of ~0.048(1)d. Further observations during this phase are very important. The current magnitude is ~14mag.
best regard, Kyoto University master's grade 2 Hiromasa Hoke
participants (3)
-
Hiromasa Hoke -
Keisuke Isogai -
Yusuke Tampo