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To: stefano@bicar.it
From: atel@astronomerstelegram.org
Subject: ATel  17930
Message-Id: <20260730070314.1AB3128807A5@server.astronomerstelegram.org>
Date: Thu, 30 Jul 2026 03:03:14 -0400 (EDT)

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Posted: Within the last 24 hours
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ATEL #17930							     ATEL #17930

Title:	EP J194531.8-612009 is a periodic source in optical wavelengths
		
Author:	N. Palivanas (UNIVAP, Brazil), G. J. M. Luna (Conicet/UNAHUR,
		Argentina), I. J. Lima (UNESP, Brazil), C. V. Rodrigues (INPE, Brazil),
		A. S. Oliveira (UNIVAP, Brazil), D. C. Souza (UNIVAP, Brazil) 
Queries:	natalia.palivanas@gmail.com
Posted:	29 Jul 2026; 19:53 UT
Subjects:Optical, Cataclysmic Variable, Transient

We report the detection of a photometric period derived from TESS observations
of Gaia DR3 6442291862707764096 / MASTER OT J194531.90-612009.5 / EP J194531.8-612009.
This source was recently identified as a X-ray transient by X. H. Tang
et al. (ATel #17926) and earlier reported by P. Balanutsa et al. (ATel
#8036) and by Gaia Collaboration, 2022 as a cataclysmic variable candidate.
Our analysis is based on eight TESS sectors (13; 27; 67; 94; 101 - 104),
including both SPOC and FFI data products. Lomb-Scargle periodograms exhibit
a strong peak at 1.897 h present in 6 out of 8 sectors and in the combined
light curve as well. The period is not present in sectors 94 and 101. The
TESS_localize algorithm (Higgins M. E., Bell K. J., 2023, AJ, 165, 141)
provides a highly significant probability that the periodic signal comes
from Gaia DR3 6442291862707764096. If this period corresponds to the orbital
motion of the system, this CV is below the period gap. In addition, the
modulation observed in the light curves is consistent with a non-eclipsing
system. Additional optical observations are necessary to determine the
nature of this periodicity.

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