(cba:news) Fwd: (cba:chat) KIS J192651.94+503301.7: likely new WZ Sge type dwarf nova

[Joe Patterson]

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 at gmail.com>
Reply-To: 	cba-chat at cbastro.org
To: 	cba-chat at cbastro.org, 'Tonny Vanmunster' 
<tonny.vanmunster at cbabelgium.com>, 'Taichi Kato' 
<tkato at kusastro.kyoto-u.ac.jp>, 'VSNET'' 
<vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp>, 
vsnet-campaign-dn at ooruri.kusastro.kyoto-u.ac.jp, 
vsnet-newvar at yahoogroups.com, 'vsnet-outburst' 
<vsnet-outburst at ooruri.kusastro.kyoto-u.ac.jp>, 
vsnet-outburst at yahoogroups.com



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>

-------------- next part --------------
____________________________________________________________
Center for Backyard Astrophysics (CBA) mailing lists
https://cbastro.org/communications/mailing-lists/ 
-------------- next part --------------
____________________________________________________________
Center for Backyard Astrophysics (CBA) mailing lists
https://cbastro.org/communications/mailing-lists/