[vsnet-alert 22247] CCD photometry of AT2018cow/ATLAS18qqn

[Tonny Vanmunster tonny.vanmunster@gmail.com via vsnet-alert]

Dear colleagues,

I have just concluded the analysis of my 2018, Jun 19/20 unfiltered CCD
photometry session of AT2018cow/ATLAS18qqn. Observations were made at CBA
Extremadura Observatory,  using a 0.40-m f/5.1 telescope and SX-46 CCD
camera, under a very clear sky.

The resulting light curve covers a time span of 2.7 hours and is rather
'flat'. It shows small modulations with an amplitude below 0.03 mag. A
period analysis using the ANOVA, Lomb-Scargle and PDM methods (Peranso),
yields no obvious periodicities.

The object was at mag 14.22 (unfiltered) on Jun 19th.

Observations will be sent to AAVSO, CBA and VSNET for further analysis.

Best regards
Tonny

-- 
Tonny Vanmunster
CBA Belgium Observatory
CBA Extremadura Observatory
www.cbabelgium.com
www.peranso.com