Dear colleagues,


ATLAS26dqo (aka TCP J16163603+4452289) was discovered by the ATLAS survey
(J. Tonry et al.) on 2026 Mar 31.5 at mag 18.8. The object subsequently
reached a peak of mag 14.0. The quiescent counterpart is a 22.8 g mag star,
implying an outburst amplitude of ~9 mag.



I have completed the analysis of my unfiltered CCD time-series observations
of ATLAS26dqo, obtained on 2026 Apr 14/15 (CBA Belgium Observatory), and Apr
15/16 (CBA Extremadura Observatory, Spain). The data were acquired under
mostly clear skies with 0.40-m telescopes.



Key findings:



*       Superhump evolution: the Apr 14/15 light curve shows the emergence
of Stage A superhumps with an amplitude of 0.07 mag. By Apr 15/16, the
system transitioned into fully developed Stage B common superhumps with an
amplitude of 0.14 mag. Note that I observed this object on multiple nights
before Apr 15/16, but no obvious modulations were seen. 



*       Period analysis:  using multiple methods (ANOVA, Lomb-Scargle,
Generalized-Lomb-Scargle and PDM via Peranso 3.1), I derive a combined
superhump period of 0.0608 +/- 0.0004d for the night of Apr 15/16.



*       Magnitude: the object was measured at mag CV = 15.5 on Apr 15th.



Conclusion:

The extreme outburst amplitude (almost 9 mag) and the remarkably long delay
(~15 days) between initial discovery and the onset of common superhumps
strongly confirm that ATLAS26dqo is a new WZ Sge-type dwarf nova.



Image calibration and photometry were carried out using Phoranso, which
enabled simultaneous photometry of additional variable stars in the same
field of view.



Continued monitoring is strongly encouraged to study the superhump profile
and evolution.



I will submit my observations to AAVSO, CBA and VSNET for further analysis.



With kind regards,

Tonny



---



Tonny Vanmunster

CBA Belgium Observatory

CBA Extremadura Observatory

http://www.cbabelgium.co <http://www.cbabelgium.com/> m



PERANSO : The Light Curve and Period Analysis Software

http://www.peranso.co <http://www.peranso.com/> m



PHORANSO: Photometric Reduction and Analysis Software 

http://www.phoranso.com <http://www.phoranso.com/>