[vsnet-alert 16456] Re: (cba:chat) Next HST observations: BB Ari

[Joe Ulowetz]

My measurement around 5h UT, from a stack of 5 x 120 sec images, is 18.875
mag, error 0.118.

-Joe U.


On Tue, Sep 24, 2013 at 10:55 PM, Gordon Myers <gordonmyers at hotmail.com>wrote:

> I was able to get 6 observations in the past six hours - all between 18.3 -
> 18.5 with V filter.
>
> Gordon
>
> -----Original Message-----
> From: cba-chat-bounces at cbastro.org [mailto:cba-chat-bounces at cbastro.org]
> On
> Behalf Of Joe Ulowetz
> Sent: Tuesday, September 24, 2013 7:58 PM
> To: cba-chat at cbastro.org
> Cc: Elizabeth Waagen; Roger Pickard;
> vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp; Gary Poyner; Arto Oksanen;
> Stuart
> P Littlefair; Michael J. Cook; Diego Rodriguez; Arne Henden; Mike Simonsen;
> Joe Patterson; noc_observatory at yahoo.com; Fritz Osell; David Boyd; Bart
> Staels; pepe kk
> Subject: Re: (cba:chat) Next HST observations: BB Ari
>
> I'm trying BB Ari right now, but I'm looking low though haze. I can see the
> stars 147 and 152, but there is no sign of BB Ari with a 120 sec exposure.
>  With 300 sec exposure I'm getting something at the right location with S/N
> less than 3 and an uncalibrated magnitude of 18.8.
>
> I'll try later when it's higher, but it is definitely faint right now.
>
> -Joe U.
>
>
>
> On Tue, Sep 24, 2013 at 2:48 AM, Boris Gaensicke <
> Boris.Gaensicke at warwick.ac.uk> wrote:
>
> > Dear All,
> >
> > the last few measurements of BB Ari show it brightening by about a
> > magnitude over its quiescent level.
> >
> > This is bad news:If this is the onset of a normal outburst, it will
> > not be back in quiescence for Friday's HST observations.
> >
> > If at all possible, please try to get additional V-band (or
> > unfiltered, if it is otherwise too faint) snapshots to monitor the
> > behaviour of the star over the next few days - those data will be
> > extremely important for deciding how to proceed.
> >
> > Best wishes,
> >
> > Boris
> >
> >
> >
> > ----------------------------------------------------------------------
> > -------------------------------- For more information on this HST
> > program, see
> >
> > http://deneb.astro.warwick.ac.uk/phsdaj/public_html/12870/
> > http://deneb.astro.warwick.ac.uk/phsdaj/public_html/12870/Targets.html
> >
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