[vsnet-chat 5643] RE: [vsnet-sequence 180] Henden sequences and charts online

["Jose Ripero" <jripero@wanadoo.es>]

I think that these charts will be very useful for visual and CCD observers,
because itīs great idea try to standarize visual and CCD sequences for use
them in our estimations of variable brightness; of these manner, if all
observers use the same sequences the acumulative errors due a different
brightness of the same comparison stars will be cancel.

These standard sequences should be used by all observers worldwide for avoid
wrong magnitudes of comparison stars.

For example, in my regular estimations of FO Per outbursts, I used the 13.4
mg. star near of variable, and in new Henden sequence its magnitude is mg.
14.0. The 0.6 magnitudes  more fainter has done that normally I
overestimated  the real brightness of the outburst.

From several months ago I had used these sequences in my variable
estimations.

Thanks to Mike, Arne and all AAVSO observers for your hard work.

Sincerely,
jripero@wanadoo.es





----- Original Message -----
From: Mike Simonsen <mikesimonsen@mindspring.com>
To: <aavso-discussion@informer2.cis.McMaster.CA>;
<vsnet-chat@kusastro.kyoto-u.ac.jp>; <vsnet-sequence@kusastro.kyoto-u.ac.jp>
Sent: Thursday, November 14, 2002 7:54 PM
Subject: [vsnet-sequence 180] Henden sequences and charts online


>
> Dear Observers,
>
> I am pleased to announce the availability of nearly 450 variable star
> charts, based on CCD photometry provided by Dr. Arne Henden, on the Sirius
> Astronomy website.
>
> These are essentially visual charts, however, text files containing the
> photometric sequence (positions, magnitudes, color and error information)
> for each star are also available online. CCD enthusiasts can now download
> the charts and sequence files from the same pages on the web at:
>
> http://joevp.20m.com/charts/henden/
>
> We plan to have all the Henden/Sumner and Henden/Simonsen sequences
> published in this format by January 2003, followed by hundreds of new and
> revised sequences and charts for CVs, LPVs and EBs as reliable photometry
> becomes available.
>
> An introduction to the text and image files for these and the many other
> charts on the website can be read at:
>
> http://joevp.20m.com/charts/about.html
>
> I would like to acknowledge the following AAVSO observers for volunteering
> hundreds of man-hours drawing, checking, editing and documenting these
> charts and sequences.
>
> Steve Greene
> Richard Huziak
> Michael Koppelman
> Vance Petriew
> Steve Robinson
> Robert Stine
> Dan Taylor
> Joe Van Poucker
> Steve Wolfe
>
> Below is a list of the stars included in this initial release of Henden
> charts and sequences.
>
> Regards,
> Mike Simonsen
> www.sirius-astronomy.com
>

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