From jop at astro.columbia.edu  Fri Dec  1 20:33:54 2006
From: jop at astro.columbia.edu (Joe Patterson)
Date: Fri, 1 Dec 2006 20:33:54 -0500 (EST)
Subject: (cba:news) HS2331+39 = And, and RX0704+26 = Gem
Message-ID: <Pine.LNX.4.64.0612012025270.11855@pluto.astro.columbia.edu>


Dear CBAers,

Olde Whiteface will be pretty bright for the next week - especially in the 
north where the Frosty Moon rides so high in the winter sky all night 
long.  Bad for our quaint little enterprise.

But HS2331 is still quite well-placed, and not much threatened by nearby 
moonlight.  We have a long observing run going at Kitt Peak now, and are 
trying to get intense coverage of this star.  Among other targets, but 
this one is particularly worth a special push.

The other northern star I wanted to recommend is RX0704+26 = Gem.  A 
little faint for most of you, but possible... and oh, are you going to 
loooovvveee THIS light curve!

joe


From jop at astro.columbia.edu  Tue Dec 12 20:05:23 2006
From: jop at astro.columbia.edu (Joe Patterson)
Date: Tue, 12 Dec 2006 20:05:23 -0500
Subject: (cba:news) stars of the solstice...
Message-ID: <457F51D3.8020702@astro.columbia.edu>


Dear CBAers,

Sorry to have been awfully quiet about targets.  Things have been busy 
with end-of-semester, KPNO observing tun, microlens, etc.

We've been getting pretty good coverage of SDSS0407-06 = Eri, and have 
again found the negative superhump which popped up last year.  It may 
well be a PERMANENT permanent superhumper.  The trouble is that it's 
sometimes a touch faint for our little scopes, and it ramps up and down 
pretty fast by 2 magnitudes or so (16-18).  This complicates the 
analysis a lot.  So I'm inclined to steer away from this difficult star.
A much brighter star which seems to exemplifies the same trends (longish 
period and permanent negative superhump, and also crossing the meridian 
near local midnight) is V1193 Ori.  Let's do that one for the next month!

North, south, east, west... it's a star for everyone.

In the north, I recommend now FS Aur, V405 Aur, and BG CMi... and 
RX0636+35=Gem.  The latter is kinda tough, the others should be easy enough.

In the south, I recommend BW Scl (still) and V1193 Ori... and BG CMi if 
you don't mind venturing a little out-of-hemisphere.

joe


From jop at astro.columbia.edu  Mon Dec 18 07:41:25 2006
From: jop at astro.columbia.edu (Joe Patterson)
Date: Mon, 18 Dec 2006 07:41:25 -0500 (EST)
Subject: (cba:news) Suspected New Dwarf Nova in Cam (fwd)
Message-ID: <Pine.LNX.4.64.0612180739090.26148@pluto.astro.columbia.edu>


Dear CBAers,

This looks like an awfully interesting object, and beautifully placed in 
the sky for northern observers.  Acquire in the evening, and let 'er rip!

joe



---------- Forwarded message ----------
Date: Sun, 17 Dec 2006 23:19:57 -0000
From: David Boyd <drsboyd at dsl.pipex.com>
Reply-To: cba-chat at cbastro.org
To: cba-chat at cbastro.org, thorsten at partita.dartmouth.edu
Cc: BAAVSS alert <baavss-alert at yahoogroups.com>,
     cba-news <cba-news at cbastro.org>, cvnet-outburst at yahoogroups.com
Subject: (cba:chat) Re: (cba:news) Suspected New Dwarf Nova in Cam

Using Astrometrica and USNO-B1.0 I've obtained the following mean position 
(with std errors) from 5 of my images taken on 2006 Dec 17 between 18.42 and 
18.47UT.

RA 5:57:18.468 ?0.003    Dec 68:32:27.01?0.02

Regards,
David Boyd

----- Original Message ----- From: <thorsten at partita.dartmouth.edu>
To: <cba-chat at cbastro.org>
Cc: "BAAVSS alert" <baavss-alert at yahoogroups.com>; "cba-news" 
<cba-news at cbastro.org>; <cvnet-outburst at yahoogroups.com>
Sent: Sunday, December 17, 2006 10:13 PM
Subject: Re: (cba:news) Suspected New Dwarf Nova in Cam


> 
> Hello all,
> 
> Just a remark -- it would be useful if someone could do astrometry
> on an outburst image, so that the quiescent counterpart can be
> identified with confidence once the object fades.  I may be able
> to get some large-telescope images in January to accomplish this.
> 
> John Thorstensen
> 
> On Sun, 17 Dec 2006, David Boyd wrote:
> 
>> I was able to observe this object for 2hrs using unfiltered CCD photometry 
>> on a 0.35m SCT before clouds intervened. It showed superhump-like 
>> modulations with an amplitude of 0.2 magnitudes and a period, according to 
>> Peranso, of 0.052+/-0.007days. The mean magnitude was approx 14.85. It 
>> appears to be another UGSU type dwarf nova.
>> 
>> Regards,
>> David Boyd
>> West Challow, UK
>> 
>>
>>   ----- Original Message -----   From: sn2005cs
>>   To: cvnet-outburst at yahoogroups.com
>>   Sent: Sunday, December 17, 2006 6:31 PM
>>   Subject: [cvnet-outburst] Fwd: Suspect on New Dwarf Nova
>> 
>>
>>   ----------------------------------------------------------
>>
>>   Dear colleagues,
>>
>>   I obtained V and B magnitudes of this object as follows:
>>
>>   object YYYYMMDD(UT) mag code
>>   OT_J055718++683226 20061217.62573 14.95V Mhh.VSOLJ
>>   OT_J055718++683226 20061217.62839 15.11B Mhh.VSOLJ
>>
>>   A USNO B1 star is located close to this object:
>>   USNO-B1.0 1585-0088462 RA=05 57 18.45 Dec=+68 32 26.9 B1=19.04
>>   R1=19.23
>>
>>   A ROSAT X-ray source 1RXS J055722.9+683219 is located at about
>>   0.4 arcmin east from this object.
>>
>>   This object seems to be a new dwarf nova.
>>
>>   Regards,
>>   Hiroyuki Maehara
>>
>>   ----------------------------------------------------------
>>   ----------------------------------------------------------
>>   ------
>>
>>   Dear Wolfgang Kloehr,
>>
>>   I have taken 60 s exposures (in Ic band) with the 14 inch telescope
>>   and confirmed the presence of the object.
>>
>>   As you note, the faint counterpart seems to be present in the DSS2
>>   red.
>>
>>   Regards,
>>   Ken'ichi Torii
>>
>>   ----------------------------------------------------------
>>   ----------------------------------------------------------
>>   ------
>> 
>>
>>   >> Dear List,
>>   >>
>>   >> i'd like to report a possible new object ~Mag 15.2CR at Ra.:
>>   05:57:18
>>   >> Dec.: +68 :32 :26 from 2006-12-16 03:54:58 UT.
>>   >> Image and data are here:
>>   >> http://www.dsi-astronomie.de/New%20object%20near%20ugc3379.htm
>>   >> Image form 2006-12-16 is a composite of 7 images a 21sec at F6.3.
>>   Object
>>   >> is visible on all.
>>   >> The weak pregnator object GSC2.2 N31020007187 is of class 3 = non
>>   star.
>>   >> http://vizier.u-strasbg.fr/viz-bin/VizieR-5?-info=XML&-out.add=.&-
>>   source=I/271/out&GSC2.2===N31020007187
>>   >> Till now i only have this image and i would like to ask wether
>>   there is
>>   >> someone who can take a confirmation of this. The weather here will
>>   be bad
>>   >> the next days.
>>   >> No known minor plantes around this position at this time.
>>   >> No known variables in GCVS / VSX at this position.
>>   >>
>>   >> thanks for your help
>>   >>
>>   >> regards
>>   >> Wolfgang Kloehr
>>   >>
>> 
>> 
>>
>>   __._,_.___
>>   Messages in this topic (1) Reply (via web post) | Start a new topic
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> 
> -- 
> ----------------------------------------------------------------------------
> John R. Thorstensen - Professor and Chair
> Department of Physics and Astronomy
> Dartmouth College
> 6127 Wilder Laboratory
> Hanover, NH 03755
> 
> Office: 239 Wilder Hall
> Phone:  voice 603-646-2869     FAX 603-646-1446   Hinman box 6127
> ----------------------------------------------------------------------------
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>



____________________________________________________________ 
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From jop at astro.columbia.edu  Mon Dec 18 17:24:36 2006
From: jop at astro.columbia.edu (Joe Patterson)
Date: Mon, 18 Dec 2006 17:24:36 -0500 (EST)
Subject: (cba:news) stars for the solstice, II
Message-ID: <Pine.LNX.4.64.0612181708410.3387@pluto.astro.columbia.edu>


Dear CBAers,

This new dwarf nova in Cam looks to be one of our faves.  In our group, 
only David Boyd has observed it yet... but his observations, as well as 
those of the Japanese, show plain superhumps at 0.053 d.  One of the 
shortest periods seen in dwarf-nova land... and in fact short enough to 
challenge (somewhat) the theories.  This is the highest priority northern 
object.

It's December now, and time to promote AH Pic (0557-59).  This is a 14th 
magnitude novalike which we observed extensively 3 years ago and failed to 
find a period.  But I think we were just unlucky; Darragh O'Donoghue sent 
me some data which strongly suggested a period, and I resolved to find out 
for sure some future December.  Now's the time to beat on this star.

SDSS0407-06 continues to be of great interest to us; my only misgiving is 
its faintness - if you can handle that, I strongly recommend it for 
continued coverage.  It has high and low states, but it doesn't quite any 
resemble any dwarf nova I know, and it has more or less permanent 
superhumps.

I had great hopes for V1193 Ori, which was more or less rookie of the year 
last year (in a somewhat abbreviated season).  However, this year's 
coverage is GREAT, and the strong superhumps of last year have completely 
vanished.  I dunno what the best strategy is... but I'm inclined to steer 
clear of it till that signal reawakens.

Delete BW Scl and HS2331+3905.  Just a little too late in the observing 
season - but they had superb runs this year.  I'll be writing both up this 
winter.

Other targets unchanged.  Since OT0557+68 (position in last email) is a 
completely new object to us, has an exotic period, and might, for all we 
know, never erupt again, it plainly deserves top billing.  I apologize to 
australites for all the northern glamor objects this season.

But at least they're heading for the hemisphere with the long nights...

joe



From jop at astro.columbia.edu  Mon Dec 18 17:27:46 2006
From: jop at astro.columbia.edu (Joe Patterson)
Date: Mon, 18 Dec 2006 17:27:46 -0500 (EST)
Subject: (cba:news) [vsnet-outburst 7369] New DN in Cam (OT_J055718+683226):
 superhump period revised (fwd)
Message-ID: <Pine.LNX.4.64.0612181726480.3387@pluto.astro.columbia.edu>


Here's a link with a finding chart and some info about the new 
transient...

joe

---------- Forwarded message ----------
Date: Tue, 19 Dec 2006 04:56:34 +0900 (JST)
From: uemuram at hiroshima-u.ac.jp
To: vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp,
     vsnet-outburst at ooruri.kusastro.kyoto-u.ac.jp,
     vsnet-campaidn-dn at ooruri.kusastro.kyoto-u.ac.jp,
     cvnet-outburst at yahoogroups.com
Subject: [vsnet-outburst 7369] New DN in Cam (OT_J055718+683226): superhump
     period revised

New DN in Cam (OT_J055718+683226): superhump period revised

     Our observation and preliminary analysis are ongoing.
We have updated our web page, now including multicolor superhumps
simultaneously obtained with V and J bands.

http://home.hiroshima-u.ac.jp/hasc/kanata/j0557/index.html

We revised the superhump period to be 0.0534(6) d
using our tonight observation.
While the object is not very bright, long time-series observations
are definitely helpful to study the temporal evolution of superhumps
of this shortest period system.

Regards,
Makoto Uemura and Akira Arai
Hiroshima University








From jop at astro.columbia.edu  Wed Dec 20 11:54:56 2006
From: jop at astro.columbia.edu (Joe Patterson)
Date: Wed, 20 Dec 2006 11:54:56 -0500 (EST)
Subject: (cba:news) var cam 06
Message-ID: <Pine.LNX.4.64.0612201151320.13805@pluto.astro.columbia.edu>


Dear CBAers,

The blizzard described by Bob a few minutes ago will probably clobber all 
of our western USA observers for a few nights.  I hope that other northern 
observers can try hard to cover var cam o6 (0557+68) during this interval.
It's an absolute winner!... and still decently bright (15.2 or so)

joe


From jop at astro.columbia.edu  Sat Dec 23 09:52:34 2006
From: jop at astro.columbia.edu (Joe Patterson)
Date: Sat, 23 Dec 2006 09:52:34 -0500
Subject: (cba:news) AH Pic signal
Message-ID: <458D42B2.5030006@astro.columbia.edu>

Dear CBAers,

Greg Bolt's two nights establish that a signal at 3.5 hours - most 
likely orbital - exists in AH Pic.  It looks decently easy to track, and 
bright enough at 14.2.  This would be a great target for intensive 
southern coverage the next couple of weeks.  If you can, take the 
integrations down to 30 s or so - there is some hint of fast periods in 
this star.

As for what suppressed the periodicity in 2002 - who knows?!  Maybe the 
signal is really a superhump... a few weeks of coverage should clarify this.

As for the north, we're still hanging on to Var Cam 06 = 0557+68.  Down 
to 15.5 now, and soon will disappear from our radar screens... but get 
it while the gettin's good!  76 minutes, impressively short.

joe