[vsnet-alert 15553] Re: Caution on MR UMa measurements

[szkody at astro.washington.edu]

Thanks for this heads-up, Bill and Gordon. I looked at the chart that HST
generates and they are indeed very close - I hope the centering gets the
right source. It certainly is a problem for ground observers separating 
out the two. I will send an email to the HST team to let them know that
most measurements will be combined values- an outburst will still show up 
as an increase in the combined mags so the monitoring of the combined
will still work to show them that MR UMa is at quiescence.
Cheers, Paula

On Thu, 28 Mar 2013, Bill Goff wrote:

> Gordon,
> Yes, I agree, they are right on top of each other in my images.  I can't resolve them with aperture photometry and my seeing.  The VSP plot at the G scale also shows the target and the 159 comp on top of each other.
>
> Bill Goff
>
> On Mar 27, 2013, at 9:23 PM, Gordon Myers <gordonmyers at hotmail.com> wrote:
>
>> The AAVSO plot of MR UMa looks like some measurements are of the 15.8
>> magnitude star 5 arc seconds south of MR UMa, not the target itself.  Check
>> out the reference image at
>>
>> http://deneb.astro.warwick.ac.uk/phsdaj/public_html/12870/MR-UMa.sdss.gif
>>
>> Ken Menzies and I have MR UMa around 17.5
>>
>> Let me know if you think I'm the one in error...
>>
>> Gordon
>>
>>
>>
>