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

[Aaron Price]

(Note I've removed aavso-discussion from the CC: list since this involves 
photometry.)

 This is a good question about a grey area.  Current AAVSO policy is to
submit absolute magnitudes, not differential. If you don't have a
magnitude of the comp star in the same filter as your observations then
what you basically have is a differential estimate with an offset. So we
recommend that you not submit that data until you can find an appropriate
comparison star value.  When possible, we find the photometry and will
post it and/or update the chart. But that is sometimes not possible,
especially for faint stars in the southern hemisphere. That is something
for which I don't have an answer for. Perhaps Arne does. I do know it is
something we plan to address with our upgrade of WebObs and the
observation pipeline in the next year.

 Note on your other comment, put the magnitude in the "comp star" field
and then the GSC ID# in the Comments Explained field. And then use Comment 
Code "G" (for Guide Star magnitudes).

Aaron


> 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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-- 
Aaron Price (PAH), Technical Assistant, Technology
American Association of Variable Star Observers
http://www.aavso.org