From jop at astro.columbia.edu  Sun Sep 16 19:19:51 2018
From: jop at astro.columbia.edu (Joe Patterson)
Date: Sun, 16 Sep 2018 19:19:51 -0400
Subject: (cba:news) A plea for Maxie
Message-ID: <9acc3914-7250-bad1-3d7f-bee53a3744c0@astro.columbia.edu>

Hi CBAers,

Maxie = ASASSN-18ey has lost many of his friends from mid-season. 
Granted, the runs are much shorter now.  But you can still get a 3-hour 
run on the star, it's still 13.5 magnitude (not stressful for anyone), 
and the waveform seems to be changing from superhump-like to 
orbital-hump-like (I think).  This would give us a chance e to define 
Porb during this observing season (2-3 more weeks).  Next year, the star 
could be mighty faint.

CBAers are really going after the intermediate polars this season!  I've 
been playing catch-up for several months.  Not yet caught up, but it 
does look like we can back off FO Aqr (relegate to occasional coverage) 
for the season - and definitely promote V1223 Sgr (also in a somewhat 
low state).  Other IPs deserving more attention now are AO Psc, V1062 
Tau, CC Scl, and Paloma (0524+42).

The dwarf novae have overwhelmed me this year.  I hope to regain my 
composure, esp. as regards the ultracompacts (AM CVns) which are so 
interesting.  Oh yeah - that reminds me: two other stars which I place 
high priority on right now: ES Cet and WZ Sge.  Definitely those guys!

joe

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From jp42 at columbia.edu  Sat Sep 29 08:44:45 2018
From: jp42 at columbia.edu (Joe Patterson)
Date: Sat, 29 Sep 2018 08:44:45 -0400
Subject: (cba:news) Fwd: (cba:chat) KIS J192651.94+503301.7: likely new WZ
 Sge type dwarf nova
In-Reply-To: <002901d45793$19bbbcd0$4d333670$@gmail.com>
References: <002901d45793$19bbbcd0$4d333670$@gmail.com>
Message-ID: <7e60a05d-dfe8-15ca-3141-11b8edd1be76@columbia.edu>

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>

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