Central Bureau for Astronomical Telegrams

CBAT "Transient Object Followup Reports"

TCP J18433189+1011051

TCP J18433189+1011051   2023 10 19.4788*  18 43 31.89 +10 11 05.1  14.0 U             Oph       9 1

2023 10 19.4788

Discovered by Yuji Nakamura, Kameyama, Mie, Japan, on two frames (10-s exp. limiting mag 15.5) taken by 300-mm F/4.0 lens and CMOS camera. Nothing is visible at this location on the frames taken on 2023 Oct. 18.4849 UT (10-s exp. limiting mag 15.5) by same instrument. --- Seiichiro Naito and Isao Endoh (NAOJ)

2023 10 19.6891

The transient is visible at the NMW wide-field camera images (135mm f/2.0 telephoto lens + SBIG ST-8300M CCD; https://scan.sai.msu.ru/nmw/ ) obtained on 2023-10-19.6891 UTC having the unfiltered magnitude CV=13.9 +/-0.1 (zero-point calibrated against APASS stars in the field). The plate-solved FITS images are available at http://scan.sai.msu.ru/~kirx/img/TCPJ18433189+1011051 ---- Stanislav Korotkiy, Kirill Sokolovsky, Olga Smolyankina, Anna Prokudina, Sergei Ostapenko

2023 10 20.103

Position end figures 31s.88, 06".5 measured with 0.25m reflector + CCD (T05) at Utah Desert Remote Observatory, USA. J2000, Gaia DR2 positions. No progenitor present in Gaia catalogue or PanSTARRS images. Gaia G mag 18.7 star (Gaia DR3 4503678723494818176) located 1.4" from transient position. Photometry as follows: Oct 20.103 UT B = 13.95, Oct 20.105 UT V = 13.94. Andrew Pearce, Nedlands, W. Australia.

2023 10 20.3932

Photometry results were B=14.24, V=14.42, Rc=14.39 and Ic=14.62 with 0.5m(F/6.8) Astrograph with FLI-PL6303E CCD (T30, iTelescope.NET @ SSO, Australia).https://meineko.com/ccd/TCP_J18433189+1011051.jpg Seiichiro Kiyota (Kakagaya, Japan)

2023 10 21.56338

We obtained the spectra of the transient TCP J10203579+3103424 on 2021-02-06.78 UTC by using a Alpy 600 spectrograph mounted on the0.6-m f/8 Ritchey-Chretien telescope at Xingming Observatory. Our spectra show a blue continuum with weak Hα emission lines, Hβ, Hγ, Hδ, Hε and other absorption lines. These features suggest that this object is a dwarf nova in outburst. Our Spectrum: https://drive.google.com/file/d/1KjdwssBf8WTFSqV0cggbEuc9zJOzp31g/view?usp=share_link --------------- Jingyuan Zhao, Xing Gao (Xingming Observatory)

2023 10 21.5634

We obtained the spectra of the transient TCP J10203579+3103424 on 2023-10-21.56338 UTC by using a Alpy 600 spectrograph mounted on the 0.6-m f/8 Ritchey-Chretien telescope at Xingming Observatory. Our spectra show a blue continuum with weak Hα emission lines, Hβ, Hγ, Hδ, Hε and other absorption lines. These features suggest that this object is a dwarf nova in outburst. Our Spectrum: https://drive.google.com/file/d/1KjdwssBf8WTFSqV0cggbEuc9zJOzp31g/view?usp=share_link --------------- Jingyuan Zhao, Xing Gao (Xingming Observatory)