[Aavso-photometry] Exoplanet host stars in VSX and VSP
Brad Walter
bswalter at hughes.net
Wed Mar 12 19:16:22 EDT 2008
Would it be possible to issue designations for all of the bright exoplanet
host stars listed in AXA and get sequences for comps in VSP? I think there
are a number of AAVSO members taking data on these stars.
> -----Original Message-----
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> Subject: Aavso-photometry Digest, Vol 52, Issue 12
>
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> Today's Topics:
>
> 1. Re: Transformation Coefficients (Michael Crook)
> 2. Re: Transformation Coefficients (Steven Orlando)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 11 Mar 2008 20:01:29 +0000 (GMT)
> From: Michael Crook <m.j.crook at talk21.com>
> Subject: Re: [Aavso-photometry] Transformation Coefficients
> To: Tim Crawford <tcarchcape at yahoo.com>, aavso photometry
> <aavso-photometry at aavso.org>
> Message-ID: <496215.87404.qm at web86211.mail.ird.yahoo.com>
> Content-Type: text/plain; charset=iso-8859-1
>
> Tim,
>
> I will be observing LPVs and I understand it is important to
> transform in these cases due to the colour differences
> between the red variables and the
> comparisons.
>
> Is there an 'idiots guide' available to transformed
> differential photometry? (I mean a REALLY basic
> guide?)
>
> Cheers,
>
> Mick
>
>
>
>
>
> --- Tim Crawford <tcarchcape at yahoo.com> wrote:
>
> > While we still have somewhat of a related thread going RE this
> > specific topic (Michael Koppelman's last post on the topic:
> > Differential vs. absolute magnitudes) I thought I would post some
> > recent values showing the difference between not transformed
> > differential photometry and transformed differential photometry for
> > the benifit of those of you who have never ventured into this
> > territory.
> >
> > This was a recent observation of V371 Per in which I had
> zero-pointed
> > the instrumental magnitudes (meaning that the IM's would equal the
> > sequence value) of the main Comp star; because of this particular
> > action it makes it easy to look at this particular Spread sheet and
> > pull off the following magnitude data.
> >
> > Filter - Not Transformed - Transformed - Difference
> >
> > V - 10.959 - 11.979 - .020
> >
> > B - 11.563 - 11.575 - .012
> >
> > R - 10.611 - 10.619 - .008
> >
> > I - 10.217 - 10.230 - .013
> >
> > It is important for you to understand that other systems
> > (scope/ccd/conditions) could have significantly larger
> differences or
> > even significantly smaller differences (while pesumably the actual
> > transformed values would have been quite close) on this
> same target,
> > at the same time, using the same
> > comp(s) stars, depending on the calculated transformation
> coefficients
> > for that system.
> >
> > Tim Crawford CTX'
> > Arch Cape Observatory
> >
> > http://homepage.mac.com/windwalker1/ACObserv.htm
> >
> >
> >
> > _______________________________________________
> >
> > Aavso-photometry mailing list
> > Aavso-photometry at mira.aavso.org
> >
> http://www.aavso.org/mailman/listinfo/aavso-photometry
> >
>
>
>
> __________________________________________________________
> Sent from Yahoo! Mail.
> The World's Favourite Email http://uk.docs.yahoo.com/nowyoucan.html
>
>
> ------------------------------
>
> Message: 2
> Date: Tue, 11 Mar 2008 20:29:56 -0400
> From: Steven Orlando <sorlando at sorlando.com>
> Subject: Re: [Aavso-photometry] Transformation Coefficients
> To: Michael Crook <m.j.crook at talk21.com>, aavso-photometry at aavso.org
> Message-ID: <004801c883d8$3290e3b0$6501a8c0 at YOURB290464667>
> Content-Type: text/plain; format=flowed; charset=iso-8859-1;
> reply-type=original
>
> Mick,
>
> An excellent software package Canopus:
>
> http://www.minorplanetobserver.com/MPOSoftware/MPOCanopus.htm
>
> Very reasonably priced.
>
> Also, while there look for the link to Brian D. Warner's book
> on Lightcurve Photometry and Analysis. There are spreadsheet
> instructions in that book
> ----- Original Message -----
> From: "Michael Crook" <m.j.crook at talk21.com>
> To: "Tim Crawford" <tcarchcape at yahoo.com>; "aavso photometry"
> <aavso-photometry at aavso.org>
> Sent: Tuesday, March 11, 2008 4:01 PM
> Subject: Re: [Aavso-photometry] Transformation Coefficients
>
>
> > Tim,
> >
> > I will be observing LPVs and I understand it is important
> to transform
> > in these cases due to the colour differences between the
> red variables
> > and the comparisons.
> >
> > Is there an 'idiots guide' available to transformed differential
> > photometry? (I mean a REALLY basic
> > guide?)
> >
> > Cheers,
> >
> > Mick
> >
> >
> >
> >
> >
> > --- Tim Crawford <tcarchcape at yahoo.com> wrote:
> >
> >> While we still have somewhat of a related thread going RE this
> >> specific topic (Michael Koppelman's last post on the topic:
> >> Differential vs. absolute magnitudes) I thought I would post some
> >> recent values showing the difference between not transformed
> >> differential photometry and transformed differential
> photometry for
> >> the benifit of those of you who have never ventured into this
> >> territory.
> >>
> >> This was a recent observation of V371 Per in which I had
> zero-pointed
> >> the instrumental magnitudes (meaning that the IM's would equal the
> >> sequence value) of the main Comp star; because of this particular
> >> action it makes it easy to look at this particular Spread
> sheet and
> >> pull off the following magnitude data.
> >>
> >> Filter - Not Transformed - Transformed - Difference
> >>
> >> V - 10.959 - 11.979 - .020
> >>
> >> B - 11.563 - 11.575 - .012
> >>
> >> R - 10.611 - 10.619 - .008
> >>
> >> I - 10.217 - 10.230 - .013
> >>
> >> It is important for you to understand that other systems
> >> (scope/ccd/conditions) could have significantly larger
> differences or
> >> even significantly smaller differences (while pesumably the actual
> >> transformed values would have been quite close) on this
> same target,
> >> at the same time, using the same
> >> comp(s) stars, depending on the calculated transformation
> >> coefficients for that system.
> >>
> >> Tim Crawford CTX'
> >> Arch Cape Observatory
> >>
> >> http://homepage.mac.com/windwalker1/ACObserv.htm
> >>
> >>
> >>
> >> _______________________________________________
> >>
> >> Aavso-photometry mailing list
> >> Aavso-photometry at mira.aavso.org
> >>
> > http://www.aavso.org/mailman/listinfo/aavso-photometry
> >>
> >
> >
> >
> > __________________________________________________________
> > Sent from Yahoo! Mail.
> > The World's Favourite Email http://uk.docs.yahoo.com/nowyoucan.html
> > _______________________________________________
> >
> > Aavso-photometry mailing list
> > Aavso-photometry at mira.aavso.org
> > http://www.aavso.org/mailman/listinfo/aavso-photometry
>
>
>
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