MASTER OT J183342.09+654019.1 superoutburst

Superhumps of this object were observed in 2021 Apr., but not so well.

YYYYMMDD(UT) mag observer 20230803.2927 17.662g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230805.3107 17.534g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230814.4402 17.555g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230822.4005 15.150g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014))

(forwarded message)

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From: andrew_simon@univ.kiev.ua Date: Fri, 25 Aug 2023 22:43:27 +0300

Dear Dr. Taichi Kato,

According to my observations in the Lisnyky observational station during the last two nights it looks like the object Gaia19cuu now in superoutburst. From the observations superhumps can be easily detected on the images attached to this letter.

Data from the Gaia shows previous outbursts with the amplitude of 4-5 magnitudes (https://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia19cuu/) Also data from Gaia Followup for 7 Jul 2019 submitted by Liam Hardy shows superhumps, due to these data I started to follow this object. ( https://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia19cuu/followup)

ZTF also detected multiple outbursts in the light curve as well as current outburst. https://lasair-ztf.lsst.ac.uk/objects/ZTF18aatluwz/

After analysing the data I found 0.068d period for 2023-08-23 and 0.077d period for 2023-08-24. But due to the relatively short duration of observations these determinations can be not precise. Obtained data relatively to the comp.star I also attached to this letter.

This night it is cloudy in Kyiv so I have no possibility to continue observations. But I hope that the object will appear to be interesting for observations over the world.

Best regards, Andrew Simon.