Central Bureau for Astronomical Telegrams
CBAT "Transient Object Followup Reports"
TCP J19065629+4019093
TCP J19065629+4019093 2025 04 29.6859* 19 06 56.29 +40 19 09.3 13.1 U Lyr 9 4
2025 04 29.6859
Discovered by Yuji Nakamura, Kameyama, Mie, Japan, on four frames (15-s exp. limiting mag. 15.5) using 0.10-m F3.0 refractor + unfiltered cooled CMOS camera. Nothing is visible at this location on the frames taken on 2025 Apr. 25.7836 UT (10-s exp. limiting mag. 15.5) --- Isao Endoh and Seiichiro Naito (NAOJ)
2025 04 29.8844
The transient is visible at images obtained with the second NMW camera (135mm f/2.0 telephoto lens + unfiltered STL-11000M CCD) on 2025-04-29.8844 UTC having CV=13.8. The plate-solved FITS images are available at http://scan.sai.msu.ru/~kirx/img/TCPJ19065629+4019093/ A blue object PS1 156382867345503665 (g=21.57 +/-0.04, r=21.54 +/-0.05) is listed in the Pan-STARRS DR1 catalogue 0.4" from the reported position of the transient. ---- Stanislav Korotkiy (Astroverty, Ka-Dar), Kirill Sokolovsky, Ekaterina Saveleva for the NMW team
2025 04 6050
follow-up : mag is, V=13.55 with 0.36m FLI 1001E 30 sec, Nayoro Hokkaido, Japan obs by, Yasuo Sano
2025 04 30.6050
follow-up : mag is, V=13.55 with 0.36m FLI 1001E 30 sec, Nayoro Hokkaido, Japan obs by, Yasuo Sano
2025 05 1.048
Ochner P., Andreoli V., and Balcon C. report the spectroscopic classification of TCP J19065629+4019093. A low-resolution spectrum was obtained with the 1.22-m telescope and B&C spectrograph (dispersion 2.25 Å/pixel) located in Asiago (Italy) on 2025-05-1.048 UT. The spectrum shows a blue continuum with Balmer lines: Hα (6562.8 Å) is in emission, filled-up by the accretion disk; Hβ (4860 Å) and Hγ (4340 Å) appear in absorption with weak central emission components, likely also originating from the disk. The other Balmer lines are present in absorption. The spectrum also shows weak helium features: He I 6678 Å in emission and He I 4472 Å in absorption. These characteristics are consistent with a cataclysmic variable (CV). We propose that TCP J19065629+4019093 is a CV.
2025 05 01.6802
follow-up : mag is, V=13.84,Slightly reduced light, with 0.36m FLI 1001E 30 sec, Nayoro Hokkaido, Japan obs by, Yasuo Sano, http://sn1997ef.web.fc2.com/sn/variable/lyr_tcpj19065629_4019093_20250430.html
