[vsnet-alert 8721] Re: [AAVSO-DIS] re Chart with sequence for new (possible) nova in Scutum

[reinder j bouma]

Thanks John for your positve input. The GCVS did not list any variable 
near the nova, but at least I should have spotted the large error in the 
114 data from ASAS-3. I now have replaced this star with a nearby 113.
The revised chart will be available soon from the given link. Be sure to 
only download and use the version with _revision RJB14102005_ in the header!

Reinder Bouma

>re http://shopplaza.nl/astro/vs-charts/v477sct.png
>
>Warning, Warning, Will Robinson!
>
>This chart contains at least three variables listed as sequence stars, do not use it.
>
>Two are known, one is a reasonably high amplitude LPV.
>
>One of them is especially bad as it is most suited to being used at what appears to be the 
>current V magnitude of the putative nova, if the ASAS3 data is anything to go by.
>
>However, I will not name the stars, I will leave it for others to double check, in case I 
>myself have made errors in cross comparing the chart with Guide 8 on my screen.
>
>I personally tend to find insufficient critical assessment in RB's charts, 
>but this one is particularly worrying.
>
>
>Couldn't keep my gob shut on this due to the sequence star listed that is near in value 
>to current nova magnitude and is in fact variable, which can lead to bad problems, 
>especially if the Argelander method of guesstimating 0.1 mag brightness distance steps 
>from one single comparator is used, rather than the steps between two comparators methodology.
>
>Bad news is the Argelander method, I wonder if that is being commented on in Boston visual workshops.
>
>John Greaves
>
>  
>