[Aavso-photometry] RE: New CV: SDSS J170213.26+322954.1 outburst

Fri Oct 7 04:59:30 EDT 2005

Dear all,

I got two eclipses last night. In addition to the deeper eclipses reported earlier the star showed also 0.3 mag superhumps. 
Period measurement with Peranso gives 0.1001 days for the orbital period and 0.1056 days for the superhumps. 

I posted comparison of the two light curves on our web server:
http://nyrola.jklsirius.fi/ccd/2005/data1006/SDSSJ1702_comp.png

Tonight seem to be cloudy here so I hope some other observers are able to follow this very interesting target.

best regrds,

arto
--
Arto Oksanen                         arto.oksanen at jklsirius.fi
Jyvaskylan Sirius ry, Kyllikinkatu 1, FI-40100 Jyväskylä, Finland 
Tel: +358-40-5659438                         Fax: +358-14-4157803
Nyrola Observatory  http://www.ursa.fi/sirius/nytt/nytt_info.html

-----Original Message-----
From: cvnet-outburst at yahoogroups.com [mailto:cvnet-outburst at yahoogroups.com] On Behalf Of Arto.Oksanen at tietoenator.com
Sent: 6. lokakuuta 2005 22:31
To: cvnet-outburst at yahoogroups.com; aavso-photometry at aavso.org
Cc: baavss-alert at yahoogroups.com; cba-news at cba.phys.columbia.edu
Subject: [cvnet-outburst] RE: New CV: SDSS J170213.26+322954.1 outburst

I am observing this star again tonight. It is about the same brightness as last night, but the eclipses are now two mags deep as they were only 1.1 mag last night. 

This live light curve is updating every 30 minutes or so while I am observing:
http://nyrola.jklsirius.fi/ccd/2005/data1006/SDSS1702_20051006C.png

A caution to anyone considering using this star from Henden photometry:

>> 17:02:24.71  +32:30:37.3  12.538  0.216  saturated?

I did find it is saturated and the true magnitude is about 0.35 mag brighter.  

arto

-----Original Message-----
From: aavso-photometry-bounces at mira.aavso.org [mailto:aavso-photometry-bounces at mira.aavso.org] On Behalf Of Arto.Oksanen at tietoenator.com
Sent: 5. lokakuuta 2005 21:16
To: cvnet-outburst at yahoogroups.com; aavso-photometry at aavso.org
Cc: baavss-alert at yahoogroups.com; cba-news at cba.phys.columbia.edu
Subject: [Aavso-photometry] RE: New CV: SDSS J170213.26+322954.1 outburst

I started my observations tonight at 17:40 UT and got the first eclipse at 17:44 UT. 
The star is bright about CV=14.7.

Quick period calculation from David's timings gives P=0.1000(86).

I have a 'live' preliminary light curve at the observatory web site:
http://nyrola.jklsirius.fi/ccd/2005/data1005/SDSS1702_20051005C.png

br,

arto
--
Arto Oksanen                         arto.oksanen at jklsirius.fi
Jyvaskylan Sirius ry, Kyllikinkatu 1, FI-40100 Jyväskylä, Finland 
Tel: +358-40-5659438                         Fax: +358-14-4157803
Nyrola Observatory  http://www.ursa.fi/sirius/nytt/nytt_info.html  

-----Original Message-----
From: cvnet-outburst at yahoogroups.com [mailto:cvnet-outburst at yahoogroups.com] On Behalf Of David Boyd
Sent: 5. lokakuuta 2005 3:10
To: arne; aavso-photometry at aavso.org
Cc: BAAVSS alert; CVnet outburst; cba-news
Subject: [cvnet-outburst] Re: [baavss-alert] Re: [Aavso-photometry] New CV: SDSS J170213.26+322954.1 outburst

Another eclipse occurred at 22:31UT. There was a slow rise and fall of about 0.6 
magnitude between the eclipses. I have now lost it behind trees. I'll upload the 
data soon.

Regards,
David Boyd (BDG)

----- Original Message ----- 
From: "David Boyd" <drsboyd at dsl.pipex.com>
To: "arne" <arne at aavso.org>; <aavso-photometry at aavso.org>
Cc: "BAAVSS alert" <baavss-alert at yahoogroups.com>; "CVnet outburst" 
<cvnet-outburst at yahoogroups.com>; "cba-news" <cba-news at cba.phys.columbia.edu>
Sent: Tuesday, October 04, 2005 9:43 PM
Subject: [baavss-alert] Re: [Aavso-photometry] New CV: SDSS J170213.26+322954.1 
outburst

> An eclipse of this system occurred with minimum at 20:07UT. The depth of the
> eclipse was approximately 1.8 magnitudes. Outside eclipse the lightcurve 
> appears
> to be flat.
>
> Regards,
> David Boyd (BDG)
>
> ----- Original Message ----- 
> From: "arne" <arne at aavso.org>
> To: <aavso-photometry at aavso.org>
> Sent: Tuesday, October 04, 2005 8:34 PM
> Subject: Re: [Aavso-photometry] New CV: SDSS J170213.26+322954.1 outburst
>
>
>> Richard Huziak wrote:
>>> Pat or Tonny,
>>>
>>> What is the anticipated max mag for the outburst, and is there a preferred
>>> ref star (& mag) you have currently chosen for your reductions?
>>>
>> It was roughly V=17.6 out of eclipse in quiescence, so the
>> current magnitude of V=13.7 or so is probably near max.
>> The eclipses are roughly 1.5mags deep in quiescence; I don't
>> know how deep they will be in outburst. As for comp stars, one of
>> the following is probably ok:
>>    RA  (J2000)  DEC         V     B-V
>> 17:02:24.71  +32:30:37.3  12.538  0.216  saturated?
>> 17:02:23.13  +32:27:29.7  14.379  0.738
>> 17:02:06.20  +32:31:30.9  14.443  0.746
>> 17:02:07.29  +32:25:19.4  13.813  0.546
>>
>> Arne
>> _______________________________________________
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>
>
>
>
>
> --------------------------------------------
> Visit the BAA Variable Star Section web site at...
>
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