[vsnet-alert 8812] Re: [AAVSO-DIS] Re: Re: Possible NewNova/Dwarf Nova in Cet - ChartError

[Aaron Price]

 The star is a big galaxy, converted to a stardot in the catalogs we
used to make the chart (which are clearly labelled in the footer). 

 This chart was marked as "provisional" on the chart itself and 
on the chart download page as "preliminary - unchecked". When we have to get 
a chart out fast, that's what we do. It usually takes the chart team many 
days to check a chart, so for an Alert Notice we put it out unchecked, 
with it marked as such. If you find an error before the team does, 
the proper course is to let us know about it by e-mailing us or using 
the CHET tool. Posting to the discussion groups is good too because 
then others know about it immediately. 

 Bob is referring to the fact that I am going to be out of the office 
tomorrow and away from any Internet contact for most of the day and 
evening. I informed the chart team of this so would be prepared and Bob 
is on the team. Bob's new chart will go online either before I sleep tonight or 
before I leave tomorrow morning, as long as he has sent it to me by then. 
Otherwise our webmaster can place it online in my absense, as she 
did when I was gone for the recent Alert Notice 331.

Aaron


On Sun, Jan 22, 2006 at 08:28:25PM -0800, Bob Stine wrote:
> I removed 8 significant star dots from the chart because they are galaxes.
> New chart on way soon, but I think Aaron is out, so I don't know who to send
> it to for release.  SRB
> 
> -----Original Message-----
> From: aavso-discussion-bounces at mira.aavso.org
> [mailto:aavso-discussion-bounces at mira.aavso.org]On Behalf Of Brian Skiff
> Sent: Sunday, January 22, 2006 8:21 PM
> To: bd-heath at bigpond.net.au
> Cc: aavso-discussion at aavso.org;
> vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp
> Subject: [AAVSO-DIS] Re: [vsnet-alert 8807] Re: Possible NewNova/Dwarf
> Nova in Cet - ChartError
> 
> 
> >>  My A2 and GSC catalogues, and the DSS, show a mag 10 galaxy at that
> spot...
> 
> 
>      Remember that the Schmidt plate-scan catalogues are rigged to
> get magnitudes for stars, and for extended objects like galaxies the
> values are several magnitudes too bright.
>      This galaxy is, however, small enough to show reliable results
> from ASAS, which shows V=13.8.  This is consistent with total V
> inferred from the existing near-IR photometry in NED, where
> total J ~11.5, and typical V-J color for a galaxy is "about 2".
> 
> 
> \Brian
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-- 
Aaron Price (PAH), Technical Assistant, Technology
American Association of Variable Star Observers
http://www.aavso.org