[vsnet-alert 18528] Re: ASASSN-15gq, likely new SU-type dwarf nova

[Tonny Vanmunster]

Dear colleagues,

Last night (2015 Apr 11/12), I obtained unfiltered CCD photometry
observations of ASASSN-15gq at CBA Belgium Observatory,  using a 0.35-m
f/6.3 telescope and STT-3200ME CCD camera. The sky was mostly clear,
resulting in a light curve with a time span of 8.2 hours. It shows the
presence of what I assume to be stage A superhumps, similar to Ian's report
below. If confirmed, this establishes ASASSN-15gq as a new SU UMa-type dwarf
nova. The sumperhump amplitude is approx 0.14 mag. A period analysis using
the ANOVA, Lomb-Scargle and PDM methods (Peranso), yields a period of 0.0658
+/- 0.0002 d. Further observations are evidently encouraged.

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

Best regards
Tonny  

www.cbabelgium.com
www.peranso.com

-----Original Message-----
From: vsnet-alert [mailto:vsnet-alert-bounces at ooruri.kusastro.kyoto-u.ac.jp]
On Behalf Of Ian Miller
Sent: zondag 12 april 2015 12:35
To: vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp;
vsnet-outburst at ooruri.kusastro.kyoto-u.ac.jp
Cc: tkato
Subject: [vsnet-alert 18527] Re: ASASSN-15pq, likely new SU-type dwarf nova

I'm sorry, I got the name wrong.  The correct name for this object is
ASASSN-15gq.

Ian.

Sent from my iPad

> On 12 Apr 2015, at 11:20, Ian Miller <furzehillobservatory at hotmail.com>
wrote:
> 
> I may have detected stage A superhumps during a short (2.8h) time-series
of this newly discovered object last night.  Their amplitude is approx
0.01mag and the ANOVA method (Peranso) yields a period of 0.0646 +/-
0.0074d.  The mean magnitude was 15.5C.
> 
> Best regards,
> Ian.
> 
> Sent from my iPad