(cba:news) Fwd: (cba:chat) KIS J192651.94+503301.7: likely new WZ Sge type dwarf nova (Joe Patterson) [2018-09-29T12:44:45Z]
Hi CBAers,
This message from Tonny suggests an interesting new target for us, with
a friendly northern position. It's also true, though, that MAXI
J1820+070 has just experienced a very rapid change in the X-ray spectrum
- which underlines the importance of continuing coverage of that star.
Superhumps, or something very like superhumps, still raging in this
17-hour binary.
joe
-------- Forwarded Message --------
Subject: (cba:chat) KIS J192651.94+503301.7: likely new WZ Sge type
dwarf nova
Date: Sat, 29 Sep 2018 03:23:59 +0200
From: Tonny Vanmunster <tonny.vanmunster@xxxxxxxxx>
Reply-To: cba-chat@xxxxxxxxxxx
To: cba-chat@xxxxxxxxxxx, 'Tonny Vanmunster'
<tonny.vanmunster@xxxxxxxxxxxxxx>, 'Taichi Kato'
<tkato@xxxxxxxxxxxxxxxxxxxxxx>, 'VSNET''
<vsnet-alert@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
vsnet-campaign-dn@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx,
vsnet-newvar@xxxxxxxxxxxxxxx, 'vsnet-outburst'
<vsnet-outburst@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
vsnet-outburst@xxxxxxxxxxxxxxx
Dear colleagues,
I have just concluded the analysis of my 2018, Sep 27/28 and Sep 28/29
unfiltered CCD photometry sessions of KIS J192651.94+503301.7.
Observations were made at CBA Extremadura Observatory, using a 0.40-m
f/5.1 telescope and SX-46 CCD camera, under very clear skies but with
strong moonlight.
The resulting light curve clearly reveals the presence of superhump-like
modulations with an amplitude of 0.09 mag. There’s a hint of secondary
humps, probably early superhumps and hence indicating that this is
likely a new WZ Sge type dwarf nova. A preliminary period analysis using
the ANOVA, Lomb-Scargle and PDM methods (Peranso), yields a combined
superhump period of 0.0581 +/- 0.0004d. The object was at mag 12.53
(CV) on Sep 28th.
Follow-up observations of this bright target are strongly encouraged.
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 <http://www.cbabelgium.com>
www.peranso.com <http://www.peranso.com>
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