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Optical follow-up of the Gaia17cuh

Object was discovered on 2017-11-02 and alerted on 2017-11-07 by A. Delgado, D. Harrison, S. Hodgkin, M. van Leeuwen, G. Rixon, A. Yoldas (University of Cambridge), on behalf of Gaia Alerts team.

First follow-up observations were provided by Terskol observatory on 2017-11-17 and 2018-11-18 during the declinig phase. Results were published in The Astronomer's Telegram .

According to the data from the Gaia Alerts pages the next outburst of the object was on 2018-05-19. This event gave us an opportunity to calculate possible date of the next outburst. Before the date of the next possible outburst we start our observational campaign from 2018-11-12. On 2018-11-17 object became a bit brighter but on 2018-11-19 it was more than 1 magnitude brighter. On 2018-11-21 object reached near maximu level with not significat brightening on the next day 2018-11-22.


Rising light curve plotted with the help of Cambridge Photometry Calibration Server (CPCS)


Finding chart with object and references stars. Magnitudes of all reference stars were assumed to be equal 0.

During 2-hours observations at Lisnyky Observational Station we detected some variations in R band with amplitude of about 0.05-0.1 magnitude.

Results of the 2-hours observations in Lisnyky Observational Station.