Central Bureau for Astronomical Telegrams

CBAT "Transient Object Followup Reports"

TCP J18174546+4324564

TCP J18174546+4324564   2024 08 06.4655*  18 17 45.46 +43 24 56.4  14.3 U             Lyr       9 5

2024 08 06.4655

Discovered by Yuji Nakamura, Kameyama, Mie, Japan, on two frames (10-s exp. limiting mag 15.5) using 0.10-m F3.0 refractor + unfiltered CMOS camera. Nothing is visible at this location on the frames taken on 2024 Aug. 01.5897 UT (10-s exp. limiting mag 16.0) by same instrument. --- Seiichiro Naito and Isao Endoh (NAOJ)

2024 08 06.969

Fiscale.S ; Ochner.P and Andreoli.V report the spectroscopic classification of TCP J18174546+4324564. We obtained a low resolution spectrum (3600-8000 Ang, dispersion 2.31 Ang/pix) of 2024rkw on 2024-08-06.969 with the Asiago 1.22m + B&C spectrograph . The spectrum shows a blue continuum and absorption of Balmer lines except for H alpha (6562.8 Ang) which is not present in our spectrum, probably filled-up by the disk emissions, also D1 and D2 interstellar sodium are presents.We propose to classify TCP J18174546+4324564 as CV. (the spectrum is available at the following link: https://photos.app.goo.gl/tsDzSiuwRQGbY5pQ9)

2024 08 07.6007

Photometry results were B =13.38, V =13.38, Ic =13.45. A little brighter than the magnitude on August 06. position end figures 45s.48, 57".0 using 0.20-m f/8 Ritchey-Chretien + CMOS + f/5.4 focal Reducer. observed by K. Yoshimoto, Yamaguchi, Japan.

2024 08 06.970

Andreoli.V: correction to previous note, this is not the classification of 2024rwk but of TCP J18174546+4324564 (now also present on TNS as 2024rwq). At the time of our classification it was not yet present on the TNS platform. Apologies for my mistake.