(cba:news) Suspected New Dwarf Nova in Cam (fwd)

Joe Patterson jop at astro.columbia.edu
Mon Dec 18 07:41:25 EST 2006


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
>>   >>
>> 
>> 
>>
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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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