Central Bureau for Astronomical Telegrams

CBAT "Transient Object Followup Reports"

TCP J00003597+1757408

TCP J00003597+1757408   2024 07 05.7062*  00 00 35.97 +17 57 40.8  11.9 U             Peg       9 9

2024 07 05.7062

Discovered by Yuji Nakamura, Kameyama, Mie, Japan, on two frames (30-s exp. limiting mag 16.0) using 0.10-m F3.0 refractor + unfiltered CMOS camera. Nothing is visible at this location on the frames taken on 2024 June 18.6944 UT (30-s exp. limiting mag 15.5) by same instrument. --- Isao Endoh (NAOJ)

2024 07 05.93758

We confirm the presence of the transient at wide-field images obtained on 2024-07-05.9376 UT with a 135mm f/2.0 telephoto lens + unfiltered SBIG STL-11000 CCD in the framework of the New Milky Way survey operating at the Astroverty astrofarm in Nizhnii Arkhyz, Karachay-Cherkessia, Russia ( http://scan.sai.msu.ru/nmw/ ). Due to the large pixel size of the camera, the transient is blended with the nearby bright star, which complicates photometry. The images are avaliable at http://scan.sai.msu.ru/~kirx/img/TCPJ00003597+1757408/ ---- Stanislav Korotkiy (Astroverty, Ka-Dar), Kirill Sokolovsky (UIUC, SAI MSU), Nikolay Potapov, Sergei Ostapenko for the NMW team

2024 07 06.662

Photometry results were B=12.21, V=12.27, I=12.32. position end figures 35s.94, 42".8 using 0.20-m f/8 Ritchey-Chretien + CMOS + f/5.4 focal Reducer; P87 Hirao Observatory. An image at http://orange.zero.jp/k-yoshimoto/TCP_J00003597+1757408_20240706.jpg observed by K. Yoshimoto, Yamaguchi, Japan.

2024 07 11.0

Andreoli.V and Castellani.F report the classification of TCP J00003597+1757408. We obtained, From Monte Baldo Observatory (OMB) located in Novezzina (Italy), a low resolution spectra (7x600s), by 0.25-m telescope + Alpy600 spectrograph (dispersion 4.9 Ang/pix), on 2024-07-11.007 . The spectrum shows a blue continuum and absorption in H delta (4100 Ang) and H gamma (4340 Ang) while H beta (4861 Ang) and H alpha (6562.8 Ang) are not present in our spectrum, probably filled-up by a disk. All the characteristics are typical of CV stars. We propose the classification of TCP J00003597+1757408 as a CV star.