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Kwee - van Woerden Solver
The Kwee - van Woerden Solver calculates
time of minimum brightness from paired (time,magnitude) data using
the well-established Kwee - van Woerden algorithm. Data pairs may
be typed into the dialog or pasted in from another source,
including multi-column data, in which the time and brightness are 2
of several columns. Various text data formats are supported,
including comma separated (CSV), tab separated (TSV), and text with
other character separators between the columns. The dialog below
shows data from the file "VV UMa data for
Kwee van Woerden.csv" pasted-in from the text file installed
in the Mira <Documents>\Mira Pro
x64\Sample Images folder.
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Kwee - van Woerden Properties
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Data format
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Specifies the type of text format. If
"User-specified separators" is selected as shown above, the
Space selector appears. This is the
case shown in the dialog above.
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Time and Brightness
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Enter the lines of (Time, Brightness) data as
shown in the dialog above. The example here uses pairs of Julian
Date and Magnitude. The data may be copied to the clipboard using a
menu command after right-clicking inside the text box.
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[Clear]
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Clears Time and Brightness data and the
results.
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Custom Separators
(may not be
visible)
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You can enter custom separator characters when the
Data Format is set to "User-specified
separators". You can select any combination of the separator
options (see below):
Space uses a space
character (spacebar) as a separator.
Tab uses the Tab
character (tab key) as a separator
Other: This text box
accepts 1 or more additional characters for use as separators.
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Time
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Specifies the column containing the time value,
beginning with column 1. Time must be specified in a decimal format
rather than HMS or other time format. For example, Julian Date and
decimal hours are acceptable formats but something like 12:14:15.4
is not.
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Brightness
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Specifies the column containing the brightness
value, beginning with column 1. If the brightness is in
astronomical Magnitude units, also check the Magnitude box.
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 Magnitude
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Check this box if the brightness values are in
magnitude units.
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First Data Row
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Specifies the first row containing data, beginning
with row 1. Use this to skip lines of "header" data that may be in
the pasted-in data.
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Plot Sample Points
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Check this box to create a plot of the data with
the calculated time of minimum marked.
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Verbose Details
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Check this box to list the internal details of the
solution in the
Main Message Pane.
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Kwee Minimum at:
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Lists the calculated time of minimum. The units of
time are the same as the units of the data. For example, if the
time is entered as Julian Date, then the result is listed in units
of "days".
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Uncertainty:
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Lists the calculated 1-sigma uncertainty in the
time of minimum. The units are the same as the units of the minimum
time (e.g., days, seconds).
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Parabolic Fit Minimum at:
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Lists the time of minimum for a Parabola fit to
the data.
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Observations
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Lists the number of observations in the Time and
Brightness data set.
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[Calculate]
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Click this button to Calculate the Kwee - van
Worden time of minimum and other parameters.
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[Save Solution]
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Click this button to save the data and solution to
a text file.
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Note:
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To paste text into the Time
and Brightness text box, right-click on the text box and
select Paste from the command menu.
Before pasting-in text, it is usually necessary to
open the text data in a text editor, then select and copy it
to the Windows clipboard (e.g., using the File > Copy or Ctrl+C command).
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Plotting the Results
If the Plot sample
points box is checked, the the data in the Sample Data box
are displayed in a
Plot window as shown below. The calculated time of
minimum is indicated by the red line.
Data Formats and Separator Options
Text-based data can come in many formats and Mira
must understand the format in order to turn text data into numeric
data used for the calculation. Different formats use different
characters, called "separators", to separate the values between
columns. Mira provides several options for the data format and for
the separator characters. In all cases, Mira considers the new-line
character between lines of text to be a separator no matter which
format is chosen. The dialog at the beginning of this topic shows
text data pasted-in as comma-separated values. Mira also supports
tab-spaced text (below, left) and a "User-specified separators"
option (below, right) in which you specify a combination of
possible separator characters. The Other box allows you to specify several
additional separator characters that will be used in addition to
the Space and Tab options.
At right, below, the "User-specified separators"
has the Space check box selected so
that a space character is used in addition to the default new-line
character. These settings were used to import the "VV UMa data for Kwee van Woerden (tab).txt" file
provided in the sample data.
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Several editing commands are available for the Time
and Brightness data. To use them, right-click inside the data box
to open a command menu.
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If a line of data cannot be parsed into a valid
(time, brightness) pair, then Mira will issue the error message
shown below. This can also indicate that the specified column
separator(s) are not valid so that the second number on the line
(the brightness) cannot be interpreted.
Related Topics
Contents
Aperture Photometry
Calculate Julian Date
Mira Pro x64 User's Guide, Copyright Ⓒ 2023 Mirametrics, Inc. All
Rights Reserved.
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