[Aavso-photometry] AAVSO Alert Notice 369 - U and B photometry errors

[Dave Lane]

I just sent Arne a screen capture, but in looking more closely I think I 
know what is happening...

If plot a chart with the VSP form set to:

Name AQ Cmi
RA: 07 47 27.6 Dec: 06 50 50

Note that this position is wrong - it is from a previous plotted chart 
(presumably saved by a cookie).

What happens is the chart is plotted at the correct position for AQ CMi 
(ie. the chart plotter ignores the RA/Dec and uses the name for the 
position lookup).

When you ask for the table photometry, it ignores the name and uses the 
stated (wrong) position instead. So clearly there is an inconsistency in 
how the two programs (chart plotter and photometry table) handle the 
input data (bug! :-).

If I blank out the RA/Dec it reports the correct photometry.

That still means the U and B photometry are out of whack for the 
previous field (which is for VSX J074727.6+065050).

--- Dave

arne wrote:
> Dave Lane wrote:
>> I noticed this once before with another object, but the photometry 
>> table for AQ CMi is out-of-whack for B and U bands. It claims 
>> ridiculously bright magnitudes for 3 of the stars in these bands. V 
>> seems ok, though.
>>
>> I'm hoping to do a time series on this object soon after dark tonight 
>> beginning about 23UT.
>>
> I'm not sure what you mean here.  If I plot the AQ CMi field
> (at least, at F-scale) and look at the photometry table, I don't
> see *any* star with a U-band measure.  Can you give me more
> information?
> Arne