[Aavso-photometry] SU TAU

[Radu Corlan]

On Mon, 27 Dec 2004, Brian C. Barnes wrote:

> I've recently added SU TAU to my list of variables I'm monitoring. The AAVSO
> chart (SE0401) lists SU TAU as 05 49 03.7, +19 04 22 (J2000.0), with a
> rather bright (but unlabeled) star to the NW. At the given location I've
> found a rather bright star, of approx. 10.11 MagV. I've noticed that lots of
> folks have submitted observations for this star. My problem is that,
> according to my copy of the GCVS, SU TAU is actually at 05:49:23.37, +19 04
> 04.78, south and east of this brighter star. According to photometry of my
> image, at the GCVS location is a star, but it is too dim in my image (20
> seconds) to get any MagV data on - my dimmest star is MagV 15.83 +- ~.5.
> 
> So my question is, is the AAVSO chart correct and the GCVS catalog is wrong,
> or is the GCVS correct, and lots of folks have been submitting observations
> for the wrong star? I'd like to be certain of my data.

GCVS is wrong on this one. The star is the one at 05:49:39.40 +19:04:21.9 
(Tycho/GSC 1307-1573). I have 10 images of this field (earliest from 
sept 2003) and can see it vary several magnitudes.

Radu

> 
> Brian C. Barnes
> 
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> 

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Radu Corlan       Snail Mail: Bucuresti sect. 1, 
rcorlan at pcnet.ro  str. Argentina nr. 28, Romania

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