[vsnet-alert 22180] Re: [vsnet-outburst 22181] ATLAS18olb: modulation?

[var at kozmos.sk]

Dear colleagues,
in the last night run (20/21-05-2018) clear superhumps with amplitude 
0.05 mag appeared. The period is about 0.059d.
The data were sent to VSNET.
Pavol A. Dubovsky
Slovakia

El 2018-05-20 22:13, Tonny Vanmunster tonny.vanmunster at gmail.com via 
vsnet-alert escribió:
> Dear colleagues,
> 
> I have submitted 4 nights of observations of ATLAS18olb to the VSNET
> team, using the designation AT 2018blk for this variable. My data were
> obtained on 2018, May 16-17-18-19 at CBA Belgium Observatory, using a
> 0.40-m f/10.0 telescope and ST-10XME CCD camera, and at CBA
> Extremadura Observatory, using a 0.40-m f/5.1 telescope and Trius
> SX-46 CCD.
> 
> In total, this represents over 600 observations covering a time span
> of 10.95 hours. A period analysis on the entire data set, using the
> ANOVA, Lomb-Scargle and PDM methods (Peranso), yields a weak signal
> with an amplitude of 0.06 mag and a very preliminary combined period
> of 0.049 +/- 0.001d (or 0.090 +/- 0.001d).
> 
> Further observations are needed to more accurately determine the 
> period.
> 
> Best regards
> Tonny
> 
> 
> Tonny Vanmunster
> CBA Belgium Observatory
> CBA Extremadura Observatory
> www.cbabelgium.com
> www.peranso.com
> 
> 
> -----Original Message-----
> From: vsnet-outburst
> [mailto:vsnet-outburst-bounces at ooruri.kusastro.kyoto-u.ac.jp] On
> Behalf Of Keisuke Isogai
> Sent: zaterdag 19 mei 2018 4:18
> To: vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp;
> vsnet-outburst at ooruri.kusastro.kyoto-u.ac.jp
> Subject: [vsnet-outburst 22181] ATLAS18olb: modulation?
> 
> ATLAS18olb: modulation?
> 
>      Kiyota-san, Roger Pickard, Crimean Obs. team (reported by E.
> Pavlenko), Itoh-san, Ian Miller and Pavol A. Dubovsky have reported
> the observations.
> The object seems to show very weak modulations. The profile is double
> wave like early superhumps. Although the most likely period is 0.08 d,
> it is too large for WZ Sge-type DNe.
>      Further observations are encouraged to establish the period.