Central Bureau for Astronomical Telegrams

CBAT "Transient Object Followup Reports"

TCP J19434530+4022060

TCP J19434530+4022060   2025 12 07.3807*  19 43 45.30 +40 22 06.0  13.8 U             Cyg       9 9

2025 12 06.69931

Nothing is visible at this location on three frames (limit mag.= 14.0) taken on 2025 Dec. 06.69931 UT. 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), Evgeniia Shevtsova, Kirill Sokolovsky (TexasTech)

2025 12 07.3807

Discovered by Tadashi Kojima, Tsumagoi,Gunma-ken, Japan, on three frames(4_s exp) taken by Canon EOS 6D digital camera + 300mm f/3.2 lens. For reference magnitude estimates 2025 May14.640UT 15.5:(13s exp), 2025 Oct28.415UT 15:, 2025 Nov29.390UT 14.0 with same instrument. Possible microlens event.

2025 12 08.4640

Follow-up photometry B =15.02, V =13.95, I =13.31. position end figures 45s.57, 04".7 using 0.3-m f/4.0 reflector + CMOS. Gaia EDR3 2076410327338621184 (G mag=14.98) is at the same position. An image at URL http://orange.zero.jp/k-yoshimoto/TCP_J19434530+4022060_20251208.jpg. observed by K. Yoshimoto, Yamaguchi, Japan.