[Aavso-photometry] RE: [AAVSO-DIS] RE: AAVSO special notice 5 object

[Walt Cooney]

Tom has in practice answered the question I was getting ready to ask - how to
submit photometry to web-obs for a new field like this where there is no AAVSO
reference star.  Tom used the GSC star and I assume he used a magnitude for it
of 11.8 which is what my friendly neighborhood planetarium program tells me.  I
didn't do this initially because there wasn't enough room in the comments
section to identify the star and the magnitude I was using for it.  Without
both, you don't know all you need to know to use the data when a better
calibration is available.  I'll submit my data with the assumption that it is
easy to find out that the GSC star is 11.8 (and not 11.81 or 11.79, how many
significant figures are reported for GSC photometry?).

The next question is what to do with my B, R, and I data.  If I use the same GSC
as a reference star and use its nominal GSC magnitude, that is patently wrong
and likely going to confuse users of the data if I can't also report the
magnitude I assumed for the reference star.  These questions have been raised
before of course.  Any updates on the progress of resolving the issue?

Thanks!
Walt





-----Original Message-----
From: aavso-discussion-bounces at mira.aavso.org
[mailto:aavso-discussion-bounces at mira.aavso.org]On Behalf Of
arne at aavso.org
Sent: Sunday, February 12, 2006 12:05 PM
To: Tom Krajci
Cc: aavso-photometry at mira.aavso.org; aavso-discussion at mira.aavso.org
Subject: Re: [AAVSO-DIS] RE: AAVSO special notice 5 object


Hi Tom!  Seiichiro Kiyota indicates that this object
is very red (B-V = 1.49), so that is why your unfiltered
differential photometry will have a large offset from Walter's.
For most novae, it is better to use a standard filter.
At 11th magnitude, you shouldn't have any problem using
a V filter for example.  Classification waits on a
decent spectra.  It is in a tough spot for a single site
to follow, so observations from everyone at all of our
longitudes will be essential to follow its light curve.
Arne

On Sun, Feb 12, 2006 at 10:12:53AM -0700, Tom Krajci wrote:
> >From: "Walt Cooney" <waltc at cox.net>
>
> >I imaged the area of the ASAS object reported in AAVSO Special Notice 5
> this
> >morning and can confirm the new object.   It is approximately 0.8
> magnitudes
> >brighter in V than the nearby star GSC 6826:280.  I am taking a time series
> in V
> >now.
>
> I have submitted about 90 minutes of time series data from this morning via
> WebObs...call it up in Quick Look by the designation 1727-24.  My unfiltered
> data shows it to be about 0.4 mag brighter than GSC 6826-0280.  No signs of
> modulation/humping.
>
> Tom Krajci
> Cloudcroft, New Mexico
> http://overton2.tamu.edu/aset/krajci/
>
>
>
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