[Aavso-photometry] odd observations of U CRT comp stars

[Richard Huziak]

Hi Yenal,

The 127 star is a suspected variable star = AAVSO 1107-06B = 127 COMP S 
.  It has never been properly investigated.  GSC 1.2 mag = 14.8 with a 
large error, ASAS data is inconclusive on variability but puts the star 
around 14.3V.  The star is GSC 4928-0039.  I'd suggest you get lots of 
data on it and see if it is truly variable.  The original chart was 
drawn by Clinton Ford off of a Stamford photo - I'm not sure how the 
sequence came about.  But it is a preliminary chart, and thus sequences 
may not be that good for a number of reasons.  Please report your 
observations of this star under 1107-06B using a 1-star ref star, and 
make sure you report what comp star you used since the sequence quality 
is unknown.  I'll jump on the star as soon as sky clears here.

For issues like this, you might want to check the Suspects Database at:
http://www.aavso.org/observing/charts/suspect.shtml

which may provide some more information.

Another good source of chart problems was the 'Report a Chart Error' 
utility, that has now, unfortunately, been removed from the menu.

rick (HUZ)





Yenal Ogmen wrote:

>Hi all,
>
>Last night I observed U Crt. I took 5 images, each one
>is a stack of 10 frames of 10 seconds. When I tried to
>do photometry I see that there is something wrong.
>Brightness of the comparison stars 127 130 135 and 138
>of the chart d are different than what I see on my
>images. Fluxes of these stars show that 127 is fainter
>than 130 and 130 is fainter than 135. What am I doing wrong?
>
>Yenal Öðmen
>  Green Island Observatory Homepage
>www.geocities.com/yenalogmen 
>Geçitkale 
>North Cyprus
>
>
>
> 
>____________________________________________________________________________________
>No need to miss a message. Get email on-the-go 
>with Yahoo! Mail for Mobile. Get started.
>http://mobile.yahoo.com/mail 
>_______________________________________________
>
>Aavso-photometry mailing list
>Aavso-photometry at mira.aavso.org
>http://www.aavso.org/mailman/listinfo/aavso-photometry
>  
>

-- 

* * * * * * * * * * * * *
Richard Huziak
Manufacturing Engineering
SED Systems
Saskatoon, SK, Canada
tel. (306) 933-1676
<huziak at SEDSystems.ca>
* * * * * * * * * * * * *