Long-period transients (LPTs) challenge our knowledge of the mechanism producing radio periodic pulsations in compact objects. Some LPTs have been associated with systems hosting a white dwarf and a low-mass star in a detached binary. Recently, a new LPT ( has been classified as an accreting cataclysmic variable (CV). In the present letter, we report on the detailed study of the X-ray variability of as observed by and between September 2025 and May 2026. Simultaneous optical and radio observations are also presented. We studied the timing variability of the source, and estimated an X-ray periodicity of P=4868(22),s, consistent with radio and optical periods. We also observe the same periodicity in the hardness ratio extracted from the observation, peaking at the minimum of the modulation. A long-term modulation is also present in the X-rays and in the B-band photometry, but it is poorly constrained by the current dataset. Spectral X-ray analysis shows the presence of a black-body component (∼0.1,keV), a collisionally ionised plasma (∼15,keV), and an absorption feature at 0.77 keV (possibly due to Oxygen-VII). This is the third LPT detected in the X-ray band, the second with a detected X-ray periodicity and variable X-ray emission, and the first conclusively recognised as an accreting magnetic CV.
Imbrogno et al. (Fri,) studied this question.