[Aavso-photometry] Software for ToM calculation (Pedro Pastor)

[Steven Orlando]

I would like to know of a software package that not only calculates the 
minimum time (the x-axis), but the minimum magnitude, minimum absolute 
magnitude or minimum differential (whatever is on the y-axis).

I have experience with a software package called minimum. I also used 
Canopus, and both of them don't calculate a minimum value on the y-axis.

I had to ask a mathematician in out research group to do it, and he used one 
of those software programs specializing towards math.

Anyone know of a software package that will do minima on both axes?

Steve
----- Original Message ----- 
From: "Shawn Dvorak" <sdvorak at rollinghillsobs.org>
To: "Pedro Pastor" <pps at dlsi.ua.es>
Cc: <aavso-photometry at mira.aavso.org>; <pps at ua.es>
Sent: Wednesday, December 26, 2007 7:18 AM
Subject: Re: [Aavso-photometry] Software for ToM calculation (Pedro Pastor)


Pedro Pastor wrote:
> Thank you very much Kazuo, Bob, and Tom,
>
> I got to know AVE but this software only looks for the period but it 
> doesn't
> calculates the precise time instant for the minima (or the maxima) of a
> light curve. It happens the same as for Peranso software (in fact both 
> share
> a great deal of functionality). Also, both applications lack the ability 
> to
> deal with eclipsing binaries. They are not aware of the "double cycle"
> feature (2 min. and 2 max.), and thy provide a period (aprox) half the 
> real
> one ?¿?
>
> I didn't know about Bob Nelson collection of software tools. I'll give 
> them
> a try to see if some package fulfils my needs.
>
> My needs are to work out an ephemeredes equation from a set of light curve
> points. I mean, I'd like to get a "initial time instant" point and a
> "period" factor in order to predict future events (together with the
> determination of the uncertainty for both parameters).
>
> Best wishes for the New Year.
>
> Pedro
>
> -----Mensaje original-----
> De: aavso-photometry-bounces at mira.aavso.org
> [mailto:aavso-photometry-bounces at mira.aavso.org] En nombre de
> tom_krajci at tularosa.net
> Enviado el: lunes, 24 de diciembre de 2007 23:56
> Para: aavso-photometry at mira.aavso.org
> CC: tom.krajci at gmail.com; tom_krajci at tularosa.net
> Asunto: Re: [Aavso-photometry] Software for ToM calculation (Pedro Pastor)
>
>
>> From: "Pedro Pastor" <pps at dlsi.ua.es>
>>
>> I'm looking for some software that performs ToM calculation for
>> eclipsing binaries.
>>
>> Could anybody provide me some information? I would appreciate any
>> comments about the software performance and usability, if you have
>> experience using it.
>>
>
> I use ´minima´ at:
> http://members.shaw.ca/bob.nelson/software1.htm
>
> It allows you to determine ToM six different ways, and uses a simple text
> file format.  Example files are provided so that you can practice with 
> them
> and see how different techniques work on different shape eclipse light
> curves.
>
> Bob has produced a whole set of useful tools for EB work...predictions, 
> ToM
> extraction, etc.
>
> And he´s still updating the software if you find bugs.
>
> Tom Krajci
> Medellin, Colombia
>
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Pedro,

For known EBs you could use the ephemerides generator at
http://www.rollinghillsobs.org/perl/calcEBephem.pl.  The epoch
information is not as up-to-date as I'd like, but it does allow you to
calculate ToMs visible from your location.

Shawn Dvorak
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