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Central Bureau for Astronomical Telegrams -- Image credits

CBAT "Transient Object Followup Reports"

TCP J18225593+1020013

TCP J18225593+1020013   2025 04 20.8470*  18 22 55.93 +10 20 01.3  15.03C             Oph       R 9

2025 04 20.8470

CV candidate classified by XOSS. Details can be found at http://xjltp.china-vo.org/kats25h002.html

2025 04 22.027

Ochner P., Ferrigno F., and Andreoli V. report the spectroscopic classification of AT2025hwl (TCP J18225593+1020013). A low resolution spectrum was obtained with the 1.22-m telescope and B&C spectrograph (dispersion: 2.25 Å/pixel) at Asiago Observatory (Italy) on 2025-04-22.027. The spectrum shows a blue continuum with Balmer absorption lines, except for Hα (6562.8 Å), which appears filled-up due to emission from the accretion disk. The Hβ (4861 Å) line exhibits a full width at half maximum (FWHM) of 1230 km/s. A likely progenitor is identified in ZTF data (Bellm et al. 2019) with a mean r-band magnitude of 18, implying a brightness increase of approximately 3 magnitudes (Δmag ≈ 3). These features are characteristic of a cataclysmic variable (CV). We propose that AT2025hwl be classified as a CV.