+ Windows 8 supported.
+ On some Windows 64-bit systems, The "hardware
fingerprint" dialog box, that is used during the
Peranso license registration, showed alternating
fingerprint values. This issue has been solved.
+ Find Extremum : an error has been detected in the
Kwee van Woerden algorithm implementation, resulting
in ToM values that typically were incorrect in the
4th or 5th decimal. Special thanks to Christopher
Lloyd and Gary Billings for notifying us about this
issue, which now has been resolved. The Kwee-van Woerden method has
been extended and offers three different
Interpolation methods :
- None : if the light curve is rather symmetric and
has a regular, non-complex shape. This corresponds
to the genuine Kwee-van Woerden method.
- Spline : if the light curve is rather asymmetric
or has a complex shape, then the genuine Kwee-van
Woerden method will fail. Observations first have to
be smoothed (interpolated). If you select Spline,
then observations will be interpolated using a
spline interpolation method, and the extremum will
be calculated on the smoothed data.
- Linear : alternatively, for asymmetric or complex
light curves, you may apply a linear interpolation
on the data, before calculating the extremum.
Several improvements have been integrated in this
+ Microsoft Vista and Microsoft Windows 7 (32-bit
and 64-bit) compatibility : we are pleased to
announce that the Peranso user interface has been
adjusted in several places to ensure full
compatibility with both Microsoft Vista and Windows
7. Examples : proper displaying of labels in windows
without truncation, cursor sizes have been adjusted
to keep their appearance consistent with Microsoft
Windows XP. Evidently, Peranso continues to work on
Windows XP as before.
+ Peranso now supports the latest AAVSO file format.
This allows to directly import observations
downloaded from the AAVSO website, using their
"Download Data" tool. AAVSO files can either be
comma delimited or space delimited (not Tab
delimited). To import such observations, select the
"AAVSO (>=2009) format" in the Peranso "Modify
Column format" dialog box.
Peranso still allows to import observations
formatted using the old AAVSO format. Select "AAVSO
(<2009) format" in the Peranso "Modify Column
format" dialog box.
+ Peranso now supports the latest AIP4Win file
format, allowing to directly import data files
generated by AIP4Win.
+ Significant performance improvements for Period
analysis calculations on large observation sets
(containing >30.000 observations), resulting in
speed increases up to a factor 50 when working with
very large data sets (containing >100.000
Note : we advise to use the FALC period analysis
method on small datasets only (<10000 observations).
+ Add ObsSet dialog box : when selecting the "Modify
Column Format" option, one can now increase the
number of columns to a maximum of 50. Used to be 15
+ The minimum 'Dot Size' for drawing observations in
an ObsWin can now be as small as 1 pixel.
Bug fixes :
+ Fixed a crash in the FALC period determination
method, when using large amounts of (>30.000)
observations. The fix applies to the FALC Workbench
+ An ObsSet with only 1 observation in it will now
be drawn in the ObsWin.
+ Fixed a bug in drawing Frequency Cursor labels :
labels are now drawn for all possible time/frequency
+ Various small bug fixes. E.g., PreWhitening
function no longer fails on ObsSets with >100.000
Added ability to import CSV files (from file or from
the Clipboard), that have a variable number of
columns within one observation set.
You can now import multi-column observations, that
are comma-delimited (so called "CSV
files"), in the Modify Column Format dialog
box. You have to set the option "Comma
delimited" in the 'Free format' section of the
dialog box. Then use the Clipboard option, to paste
comma-delimited observations directly from the
Windows clipboard, or use the File option to import
- Bug fix in the Period Determination dialog box :
when working with Hours as time unit, one can now
specify start and end values above 24 hours.
Added compatibility for Windows Vista platform.
- Added Uninstall option.
- Bug fix in Properties dialog box of ObsWin, PerWin
Minor bug fixes.
Period Determination dialog box has been extended
with the Planetary
Transit AoV method, a brand new
and very efficient method to
search for planetary transits in stellar
light curves, invented by A.
supports the AIP4Win™
v2 format in the Add Observation Set dialog box.
Both the magnitude and magnitude error values of the
variable are extracted from the AIP4Win file.
- Several minor bug fixes.
Period Determination dialog box has been extended
with the Phase
Binned AoV (Analysis of Variance)
period analysis method, designed by A.
Schwarzenberg-Czerny. This method is
commonly used by professional astronomers
on a wide variety of variable stars.
- The Period Determination dialog box has
furthermore been extended with an "Auto"
toggle button next to the 'Resolution' field, that
allows to force an automatic calculation of the scan
resolution value (based a/o on the time span of the
- Several minor bug fixes, and optimlzed memory
- The File menu has been extended with a command "Settings" to display and change global Peranso settings. It allows
a/o to modify the number of significant digits used in displaying Time, Frequency and Theta values in Peranso windows.
- MagError values are visually represented as a 'vertical bar' centered around the corresponding magnitude dot
in the light curve. The bar normally extends above and below the observation by the amount of the error. We have
extended the Form tab of the ObsWin Properties dialog box with an entry "Half-size mag-error bars". If this toggle
is set, the MagError bars extend above and below the observation by only half the amount of the error.
- Added function to sort the Observation Sets of an ObsWin by 3 possible criteria : the minimum JD (X Value) of
each obsset, the Observer name or the Description. Most convenient is to either sort the ObsSets by Observer name,
or following the minimum JD. The function is available in the Observation Sets menu of an ObsWin, and is called
- Added function "Write Summary to File" in Observation Sets menu of an ObsWin. This function writes the header
information of all Observation Sets of the current ObsWin to a user specified file. For each ObsSet, the
following information is written : Key (identifier) of ObsSet, Observer, Description, Min JD (X value) of the start
observation, Max JD of the end observation, Timespan between both values, Amount of active observations,
Amount of inactive observations, total amount of observations, and finally the word "True" or "False" to resp.
indicate if the ObsSet has been heliocentric corrected or not. The function is particularly useful to quickly create an "observation log file" of all observation sets.
- Fixed bug in drawing of YError Bars : occassionally, the drawing of YError Bars made the Y axis range (min and
max values of Y axis) abnormally large.
Peranso installation programme now correctly registers all Peranso DLL and system files.
- PhaseWin properties : when opening a v1.x Peranso file, the graph in the PhaseWin became invisible if
the user clicks on "OK" in the PhaseWin properties form. This bug has been corrected.
- AIP4Win v1.4.x files could no longer be imported. This bug has been corrected.
- PhaseWin : the mouse coordinates, that appear in the lower right corner of the PhaseWin, normally are displayed in
light blue color. However, if you now move the mouse over an observation in the PhaseWin, the display will switch to the color of the corresponding observation, and JD value of the observation will be displayed as well.
- PhaseWin : when exporting PhaseWin data, or copying them to the clipboard, the
MagError and JD values are now listed as well.
Each output line thus consists of Phase, Mag,
MagError and JD.
- PhaseWin : if you click on an observation in a PhaseWin, the corresponding observation in the ObsWin will blink for
a few seconds. That way, you can easily correlate observations in the PhaseWin with observations in the ObsWin.
Overview of new
Peranso 2.0 functions.
that indicates how
"planet-like" a transit event
is, using only the transit period,
duration and depth, has been integrated in
Peranso's EELBS Info Form and in the Tool menu.
- Minor bug fixes.
- Peranso now supports the
(Wils)" method for period determination of eclipsing
Algol-type (EA) binaries. It works on photometric survey data with only few observations
showing the variable in faint state. The method is available through the Tool menu of
an Observation window.
- LightCurve Workbench : extremum calculations now also show an extremum error value
(time), that is derived from the residuals of the polynomial fit.
- Heliocentric correction : fixed bug that occasionally made an Observation Set invisible
after an heliocentric correction calculation.
- LightCurve Workbench : if no margin cursors are set, the extremum will be calculated on
the entire lightcurve, and the first minimum or maximum found, is returned.
- Add Observation Set : the Column Format dialog box has been extended with a check box
"Linux file" to be used when reading in observations from a Linux file (which uses specific
line feed characters).
- Lightcurve Workbench : the Polynomial fit function has been extended with a "drawing resolution"
field that determines the number of steps with which the polynomial will be drawn. It is just a
visualization parameter, that does not influence the internal accuracy of the polynomial calculation.
- Lightcurve Workbench : when clicking on one of the Extremum overlays in the table of the Extremum
tab, the Results values "Ext. at" and "Value" will show the X resp. Y value of the Extremum indicator.
For Peranso files prior to version 1.36, no Y value will be shown.
- Add Observation set dialog box : fixed problem with
pasting data to the clipboard at first time usage.
supports the ASAS (All Sky Automated
Survey) format in the Add Observation Set dialog box. Simply copy the
ASAS data to the Windows clipboard and paste the contents in the Peranso Add
Observation Set dialog box.
- Peranso supports the NSVS (Northern Sky Variability
Survey) format in the Add Observation Set
dialog box. Simply copy the NSVS data to the Windows clipboard and paste the contents in the Peranso
Add Observation Set dialog box.
- When adding observations to an Observation Window, by reading data from file, there is no
longer a limit on the number of columns in the data file. The Column Format dialog box has been
extended with the option ">3 columns" to read data from multi-column files. The first column
must contain the time of observation and the second column the magnitude. All other columns are
- File Open/Save : the path most recently used in a File Open or File Save command is made persistent
(if you exit Peranso, the most recently used path will be memorised for next launches of Peranso).
- Several other settings have been made persistent,
such as all settings in the Column Format dialog box of an Add
Observation Set operation; the unit (Freq or Time) setting in the Period Determination dialog box; number of significant digits in SignificantPeriodsTable; etc.
- A user can now hide parts of the Add Observation Set dialog box to simplify its appearance, using the
small arrow buttons at the right side of the dialog box. These settings are persistent.
- Added a "Getting Started" welcome screen for first time Peranso users.
- Lightcurve Workbench : Fixed bug in "Extremum" tab. The "Export" of polynomial coefficients is now
only possible for rows of type 'polynomial'.
- Binned Observation Window : when applying an heliocentric correction, the window is now correctly
Lafler-Kinman string length period determination technique. Used mainly
for analysis of Cepheid and RR Lyr observations.
- File menu shows list of recently opened/saved Peranso files
- Bug fix in reading of Peranso v1.32 files.
Occasionally, Phase Windows of v1.32 files were not
EEBSL method for exoplanet transit detection.
- Binned ObsWin (Lightcurve Workbench) : Y Error bars are redrawn after detrending and/or
applying a JD or mag offset.
- Binned ObsWin now also inherits the X- and Y-axis extrema values from its parent ObsWin.
- Binned ObsWin : when using the 'Export data to file' or 'Copy data to clipboard' commands, the
Y Error Bar values (stdev) are also exported/copied.
- Trendlines are stored/read from Peranso files
Period Significance analysis : Period windows now are correctly drawn when reading
ANOVA and Renson windows from a Peranso file and immediately starting a Period Significance
- Changed Epoch handling for Phase windows : default
epoch is JD of first observation
LightCurve Workbench : export of coefficients
prohibited if no polynomial is selected
- LightCurve Workbench : fixed bug in drawing of YError Bars (binned window) after deleting inactive observations
- Fixed bug in reading of AIP4Win files when decimal separator
for magnitude field is not a "."
- New dialog box "Frequency Cursor Value" in Period Analysis menu of a Period Window.
Through this dialog box, as user can enter a precise value at which to position the
Frequency cursor of the Period Window. If a Phase Window is associated
to that Period window, it will be redrawn to show the corresponding phase.
- Info dialog box of Period Window and Phase Window
modified. It no longer displays the dominant period and its error value, but the period and error value corresponding to the
position of the Frequency cursor.
Lightcurve Workbench in Observation Window. This
powerful tool allows sophisticated light curve
analyses, such as data binning with
error bar plots, polynomial fitting,
extremum finding, etc. Find all details here.
- Ability to save multiple Observation Windows to
one single Peranso file.
- Ability to store/read Margin Cursors of an
Observation Window from a Peranso file
- Ability to set the epoch value, used in calculating a Phase Window. The epoch value can be entered through the "Info" form of a
Period Window (in that case, the epoch value is propagated to all child Phase Windows of the current Period Window), or through
the "Info" form of a Phase Window (in that case, the epoch value is specific to that Phase Window, and is propagated to the
parent Period Window, but not to any other Phase Window).
- Added file MSSTDFMT.DLL to the setup programme.
- Fixed problem in reading AAVSO file format.
- Fixed small bug in calculating start and end
values for Jurkewich period analysis.
CLEANest / SLICK method (Foster) for multi-periodic
data analysis. All functions are conveniently
grouped in the CLEANest WorkBench dialog box. It
includes a/o operations to display a Model Function
and residuals (see help text for more information).
- Bug fix in reading AIP4WIN files (files could not be read in v1.15).
- When you start an analysis, the period analysis Parameters dialog box defaults to scan by frequency
(i.s.o. by period). The information content in a spectrum analysis is evenly spaced in frequency, not
- A default value for the 'resolution' field in the Parameters dialog box will be calculated, based on the time span of the observations and the start and end values for the frequency/period scan. The resolution value proposed by Peranso is
small enough that you don't waste CPU time, and big enough that you can be sure you won't miss any significant peak. The lowest value suggested by Peranso is '500'. Evidently, you may overwrite
the value suggested by Peranso.
- Improved algorithm to calculate default start and end values for frequency/period scan.
- Number of significant digits in displaying a Frequency Cursor value is determined by the Precision Indicators used in the Significant Periods table.
Period determination dialog box : Start and End values
are automatically generated (based on the time span
of the observations), but may be overwritten by the
- Significant Periods Table : the table has been
completely reworked, and the algorithm to identify
significant periods has been optimized as well. The
'Copy to Clipboard' command will only copy the
selected entries of the Significant Periods Table to
the Microsoft clipboard.
- Double clicking a Peranso file (.PER) in your
Windows Explorer, or dropping a Peranso file or text file
(with time-mag pairs) on the Peranso program icon, will start
Peranso and open the indicated files.
- Peranso files now memorize start, end and resolution values used for period calculations.
- Observations window : the Info form now also lists mean, standard and variance Y-values of
active observations (last 3 fields)
- Several minor bug fixes.
- Fixed a bug in reading
negative V-C values from AIP4WIN files
- ObsWin : added operation to delete all inactive observations from one observation set, or from all observation
sets at once.
- Fixed a bug for Windows98 users that have no scripting (VBScript) installed on their PC. Those users sometimes reported that
Observation or Period Windows appeared without a light curve or graph.
- Fixed clipping problem
with mouse label (specific graphics cards).
- Extended SetUp program
with additional Microsoft component (ocx) files.
- Added ANOVA method for period analysis. It employs periodic orthogonal
polynomials to fit observations, and the analysis of variance (ANOVA) statistic
to evaluate the quality of the fit. This method was recently
proposed by Schwarzenberg-Czerny (AJ, 460, L107-110, 1996). It
strongly improves peak detection sensitivity and damps alias
- Full View command : fixed bug in redrawing of prewhitened period windows
- Added RoboEx32.dll file to SetUp program.
- Added support for AAVSO
file format : observations now can be directly imported from
an AAVSO data file into a Peranso Observations Window, using
the "Add Observation Set" command. Fainter-than
(<) and uncertain (:) observations are omitted.
- Fixed bug in Phase window related to the drawing of inactive observations in the folded light curve.
- When importing data from an AIP4Win file in the command " Add Observation Set" of an Observations Window, the time of the observation (JD) no longer refers to the start of the exposure, but to mid-exposure time.
- A trial version now
operates for 10 minutes before shutting down, during the
14-days trial period.
- Fix in Period Window :
sometimes the period curve is not drawn, when selecting one of
the period analysis methods from the "Period Analysis"
menu of the Peranso desktop. Work-around : use the
"Period Determination" icon on the Period Window
- Change in Peranso
licensing strategy (shareware model applied)