Re: tass star 240.0543 +9.3849

[jg <jg@jgws.freeisp.co.uk>]

Tom Droege wrote:

> This is the first time I have met my goal of releasing a measurement within
> 24 hours.  I could not find the star in VizieR.  At least nothing seemed
> close to me.   This measurement is roughly 22 hours old.
> 
> tass star 240.0543 +9.3849 Vmag 10.12  Imag 9.64  (mean values for 2 hour run)
> 
> The magnitude decreased linearly (brightened) through the run changing by
> 0.3 mag in V and I.
> 
>
Hi Tom

GSC 0948 1004 lies at 240.0541 +09.3849 according to Tycho 2 astrometry
(quoted error around 0.05 arcsec in both RA and Dec)

Tycho2 derived Johnson V magnitude is 10.0, assumed Tycho 2 BT&VT
derived Johnson B-V = 0.43

High rise speed and colour generally fits delta Scutid and/or RR Lyr
and/or SX Phe and/or even an eclipser coming out of eclipse and/or
anything else (covers self as comprehensively as possible ;) ).

Probably solveable in a few nights of follow up run by someone???

VizieR should have coughed this one up, at least from the Tycho data
even if it missed the GSC somehow.

That's why I like people to have some sort of star chart program that
they can have a quick look at fields with, preferably one with a
complete GSC at least.  You get a screen full of graphical display,
whereas (and I don't know why for) sometimes the text based co-ordinate
and error box VizieR interface seems to miss.  Probably not clicking on
enough options, or more likely too many.

Alternatively aladin lets you plot DSS images so you can see if there is
anything there the cataloguers have missed, though granted this latter
might not be so friendly for the bandwidthly challenged (like me).

Cheers

John

John G
UK


(right, I've rechecked this three times, the above seems right...
...getting paranoid now ;) )