T CrB: Possible onset of nova eruption
According to a report posted to the VSOLJ mailing list by Iijima-san in Asiago, Italy, T CrB was measured at about 7 mag as of 21:00 UT on September 4, suggesting that a nova eruption might have begun.
Further observations are strongly encouraged to confirm this report.
On 2025/09/05 8:27, Kojiguchi wrote:
T CrB: Possible onset of nova eruption
According to a report posted to the VSOLJ mailing list by Iijima-san in Asiago, Italy, T CrB was measured at about 7 mag as of 21:00 UT on September 4, suggesting that a nova eruption might have begun.
Further observations are strongly encouraged to confirm this report.
WebObs search in AAVSO, magnitude of T CrB were reported as
T CrB JD:2460923.40834 UT:2025 Sep.04.90834 mag:9.857 V (JD:2460923.40834 Sep.04.90834 -> around UT Sept04 21:48)
also
T CrB JD:2460923.36875 UT:2025 Sep.04.86875 mag:9.9 Vis (JD:2460923.36875 Sep.04.86875 -> around UT Sept04 20:51)
Noriaki
On September 5 at 10:20 UT, I performed a confirmation using the smart telescope Seestar S50. As a result, no significant brightness variations were detected. This finding is in continuity with the ongoing Seestar monitoring campaign in Japan as well as the AAVSO reports from September 5. It may require further consideration as to whether Iijima-san's report represented a genuine signal.
Dear colleagues,
I am reporting a recent photometric observation of the recurrent nova T Coronae Borealis, obtained from Meshtitsa Observatory (Bulgaria).
The star remains at its typical quiescent magnitude.
The measurement is provided below in the standard AAVSO format:
#NAME, DATE, MAG, MERR, FILT T CrB, 2460924.24362, 10.094, 0.0045, V
Technical details: * **Telescope:** 0.25-m F/4.8 Newtonian reflector * **Mount:** Sky-Watcher EQ6-R Pro * **Camera:** ZWO ASI533MM Pro (cooled) * **Filters:** Baader Bessel V
Clear skies,
Nikola Antonov Meshtitsa Observatory (https://astro.iaps.institute) Institute for Advanced Physical Studies (https://iaps.institute) AAVSO Observer Code: ANNA
На пт, 5.09.2025 г. в 14:17 K. Imamura imako@pc.117.cx написа:
On September 5 at 10:20 UT, I performed a confirmation using the smart telescope Seestar S50. As a result, no significant brightness variations were detected. This finding is in continuity with the ongoing Seestar monitoring campaign in Japan as well as the AAVSO reports from September 5. It may require further consideration as to whether Iijima-san's report represented a genuine signal.
-- Kazuyoshi IMAMURA Anan Science Center (JAPAN)
On 2025/09/05 8:27, Kojiguchi wrote:
T CrB: Possible onset of nova eruption
According to a report posted to the VSOLJ mailing list byIijima-san in Asiago, Italy,
T CrB was measured at about 7 mag as of 21:00 UT on September 4,
suggesting that
a nova eruption might have begun.
Further observations are strongly encouraged to confirm this report.
vsnet-alert@ooruri.kusastro.kyoto-u.ac.jp
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K. Imamura -
Kojiguchi -
Nikola Antonov -
Noriaki Onodera