Central Bureau for Astronomical Telegrams

CBAT "Transient Object Followup Reports"

TCP J17583414-2652300

TCP J17583414-2652300   2023 05 16.6980*  17 58 34.14 -26 52 30.0  12.0 U             Sgr       I 0

2023 05 16.698

0.5-m F/6.0 + CCD (KAF-1001E) unfiltered : K.Itagaki

2023 05 16.7449

Photometry results were V=13.91, Rc=12.41 and Ic=11.03 with 0.28m SCT + QSI 632ws CCD at TAO-Kamagaya, Japan https://meineko.com/ccd/TCP_J17583414-2652300.jpg Seiichiro Kiyota (Kamagaya, Japan)

2023 05 17.

Time of discovery, telescope and camera. http://k-itagaki.jp/images/380mm.jpg

2023 05 17.636

Position end figures 34s.19, 29".5 measured with 0.35m R-COP reflector + CCD at Perth Observatory, W. Australia. J2000, Gaia DR2 positions. Photometry using R-COP as follows: May 17.636 UT V = 14.77 and B = 17.09

2023 05 17.636

Report on May 17.636 UT from Andrew Pearce, Nedlands, Western Australia

2023 05 18.656

Photometry using 0.35m R-COP reflector + CCD at Perth Observatory, W. Australia as follows: May 18.656 UT V = 14.90, I = 10.99, R = 12.76 and B = 17.30. Andrew Pearce, Nedlands, Western Australia.

2023 05 15.9205

We report pre-discovery detection of TCP J17583414-2652300 at the unfiltered magnitude CV= 13.1 +/-0.2 on images obtained with the NMW camera (135mm f/2.0 telephoto lens + SBIG ST-8300M CCD; https://scan.sai.msu.ru/nmw/ ) at 2023-05-15.9205 UTC. We obtained additional imaging of the nova on 2023-05-18.07 using a 80mm refractor with Canon EOS 600D digital camera measuring the nova brightness TG= 14.37 +/-0.01. The images are available at http://scan.sai.msu.ru/~kirx/img/TCPJ17583414-2652300/ ---- Kirill Sokolovsky, Stanislav Korotkiy, Nikolay Potapov, Olga Smolyankina, Anna Prokudina, Sergei Ostapenko