Central Bureau for Astronomical Telegrams

CBAT "Transient Object Followup Reports"

TCP J19183710+2127170

TCP J19183710+2127170   2023 07 29.6761*  19 18 37.10 +21 27 17.0  12.8 U             Vul       9 9

2023 07 29.676

Discovered by Tadashi Kojima, Tsumagoi,Gunma-ken, Japan, on three frames(4_s exp) under limiting mag.= 13.8 taken by Canon EOS 6D digital camera + 300mm f/2.8 lens. Nothing is visible at this location taken on 2023 Jun18.622 UT under limiting mag.= 14.0. Mag,=13.3 on 2023 Jul6.530UT,Mag13.0 on 2023 Jul25.502UT, with same instrument. ZTFJ191837.29+212722.1 brightening?.

2023 07 30.0417

Position end figures 37s.29, 22".2 measured with 0.50m reflector + CCD at Skygems Observatory, Spain. J2000, Gaia DR2 positions. Position corresponds to ZTF J191837.29+212722.1 which is listed as a semi-regular variable star in VSX. Andrew Pearce, Nedlands, Western Australia.

2023 07 30.9220

I do Photometry of the star in the position reported by Andrew Pearce. V=14.04 and Ic=12.56 with T18, iTelescope.NET (0.32-m f/8.0 reflector + 0.66 reducer + QHY600M-PH-US Mono CMO) at AstroCamp at Nerpio, Spain. https://meineko.com/ccd/TCP_J19183710+2127170.jpg - Seiichiro Kiyota (Kamagaya, Japan).

2023 07 29.676

Correction it's 2023 Jul16.530UT,not 2023 Jul6.530UT,Tadashi Kojima