Central Bureau for Astronomical Telegrams

CBAT "Transient Object Followup Reports"

TCP J21220926+4926242

TCP J21220926+4926242   2025 11 18.4214*  21 22 09.26 +49 26 24.2  12.8 U             Cyg       9 9

2025 11 18.42144

Discovered by Shizuo Kaneko, Kakegawa, Shizuoka, Japan, on three frames (10-s exp. limiting mag. 15.2) using Canon EOS 6D mark2 + f=200mm F3.0 lens. --- Isao Endoh and Mikiya Sato (NAOJ)

2025 11 18.63454

follow-up: CV=+13.2 mag, with, the NMW survey camera (135mm f/2.0 telephoto lens + unfiltered ST-8300M CCD). The NMW survey operates at the Astroverty astrofarm in Nizhnii Arkhyz, Karachay-Cherkessia, Russia ---- Stanislav Korotkiy (Astroverty, Ka-Dar), Ekaterina Saveleva, Kirill Sokolovsky (TexasTech)

2025 11 14.443

Prediscovery image 2025 Nov 14.443 Mag=12.8U,on two frames(limiting mag13.8)( https://tomo-kato.jp/large_image.php?file=251119-4.jpg) taken by Canon EOS 6D digital camera + 250-mm lens. by Tomoo Kato, Shimizu, Shizuoka, Japan

2025 11 19.41172

Follow-up photometry V mag=12.91. using 135-mm f/2.0 lens + V filter CMOS. observed by K. Yoshimoto, Yamaguchi, Japan.

2025 11 19.7260

follow-up: CV=+12.9 mag, with, the NMW survey camera (135mm f/2.0 telephoto lens + unfiltered ST-8300M CCD). The NMW survey operates at the Astroverty astrofarm in Nizhnii Arkhyz, Karachay-Cherkessia, Russia ---- Stanislav Korotkiy (Astroverty, Ka-Dar), Alexander Getmansky, Kirill Sokolovsky (TexasTech)

2025 11 23.7302

follow-up: CV=+12.5 mag, with, the NMW survey camera (135mm f/2.0 telephoto lens + unfiltered ST-8300M CCD). The NMW survey operates at the Astroverty astrofarm in Nizhnii Arkhyz, Karachay-Cherkessia, Russia ---- Stanislav Korotkiy (Astroverty, Ka-Dar), Kirill Sokolovsky (TexasTech)

2025 11 22.4763

Shizuo Kaneko forwarded a follow up observation of this TCP by Minoru Owada, Hamamatsu, Shizuoka, Japan, on 2025 Nov. 22.4763 UT using 0.25-m f/11 reflector + Nikon D810A digital camera (ISO 3200 10-s exp.). Position end figures 08s.98, 25".2 (measured by Kaneko). --- Isao Endoh (NAOJ)

2025 11 25.7085

follow-up: CV=+12.4 mag, with, the NMW survey camera (135mm f/2.0 telephoto lens + unfiltered ST-8300M CCD). The NMW survey operates at the Astroverty astrofarm in Nizhnii Arkhyz, Karachay-Cherkessia, Russia ---- Stanislav Korotkiy (Astroverty, Ka-Dar), Ekaterina Saveleva, Kirill Sokolovsky (TexasTech)