Peranso includes these powerful features. Detailed information is available in the online User Guide.

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Light Curve and Period Analysis Software

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An extensive set of period analysis methods to detect periodicities in time-series data :

**Lomb-Scargle**, **Generalized Lomb-Scargle**, **Bloomfield**, **Discrete Fourier Transform DFT** (Deeming), **Date Compensated Discrete Fourier Transform DCDFT **(Ferraz-Mello), **CLEANest **(Foster), **FALC** (Harris), **Jurkewich**, **PDM **(Phase Dispersion Minimization), **Dworetsky**, **Renson**, **Analysis of Variance ANOVA **(Schwarzenberg-Czerny), **Phase-binned AoV **(Schwarzenberg-Czerny), **Lafler-Kinman**, Planetary **Transits AoV**, **WWZ** (Weighted Wavelet Z-Transform) (Foster), **EEBLS **(Kovacs) for exoplanet transits.

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Multiple window types to display **observation sets**, **period diagrams**, **phase diagrams**, etc. Each observation set is drawn in a distinctive color, that is consistently used throughout all related windows.

Middle column: Observations window with corresponding Period window and Phase window

Right column top: Extremum finding in an Observations window

Right column bottom: auto-generated AAVSO Observations window

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Import observations using the Microsoft Windows **clipboard**

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Visualization of the CLEANest **Model Function**, showing how selected frequencies/periods fits the observations, completed with the ability to show **Residuals**, resulting from subtracting the Model Function form the observations.

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Seamless integration with **LesvePhotometry**, allowing to directly plot a light curve from a LesvePhotometry AAVSO or CBA (Center for Backyard Astrophyics) report. You can also **clean **your LesvePhotometry reports by graphically marking incorrect observations in the Observations window and initiating a one-step cleaning process of the report.

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Period determination of eclipsing Algol-type (EA) binaries using the **EASolver **method (Wils). It works on photometric survey data with only few observations showing the variable in faint state.

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Calculating and drawing Period windows has become **significantly faster** compared to Peranso 2, using some novel techniques. Compute-intensive operations, such as a Significance Analysis, easily required 30 minutes or more to complete in Peranso 2. They now on average complete in less than a minute.

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Easily visualize light curves with **several hundred thousand of observations**. Peranso uses an **innovative drawing technique **to optimize the amount of observations to be drawn, while still preserving the overall shape and characteristics of the light curve. Using a low-end laptop, it takes less than a few seconds to draw a light curve with over 600,000 observations, and to zoom in on any particular section

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When hoovering the mouse over an observation in an Observations window, a **call-out box** shows up with relevant information about the observation, including the time (Julian and Calendar Dates), brightness, used filter, observer name (if applicable), etc

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Next to a **Julian Date calculator**, Peranso also includes an **Ephermeris Calculator **(see figure at right), that generates an ephemeris for exoplanet transit times, or for variable star eclipse times. Simply enter the name of the object, the epoch data and the observing interval, and you will get the list of all ephemeris dates and times, expressed in Julian Date and Calendar Date formats

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Temporary **deactivate **observations and study the impact on your period analysis results

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Next to **AAVSO **and** ZTF, **Peranso 3 allows to

directly generate light curves from following

surveys and databases (without you having to visit

a survey's website and make complex queries):

**ASAS-3**, **Catalina Surveys DR2**, **Gaia (DR2, **

EDR3, Alerts), Hipparcos, **Kepler, Kepler K2, **

NSVS, **PanSTARRS1 DR2, SkyMapper DR2 **and

**SuperWASP**.

surveys and databases (without you having to visit

a survey's website and make complex queries):

EDR3, Alerts), Hipparcos

NSVS

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Natively import file-based observations from Microsoft **Excel**, **AIP4Win v2**, **AAVSO Extended File Format EFF**, AAVSO International Database AID, **ASAS **(All Sky Automated Survey), **ASAS-SN **(All-Sky Automated Survey for Supernovae), **LesvePhotometry, DASCH **(Digital Access to a Sky Century at Harvard)** **and **ZTF**. We will soon add **ALCDEF **(Asteroid Light Curve Data Exchange File)

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A unique **Lightcurve Workbench** for advanced light curve analysis, comprising functions for data reduction (**binning**), **polynomial fitting**, **extremum finding**, etc. We also added **LOWESS **(locally-weighted scatterplot smoothing) fitting and detrending to smooth light curves and to **auto-detect outliers **(observations that may be removed from the light curve).

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User controlled "**prewhitening**" routine for elimination of aliases and confirmation of secondary periods

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Particularly effective, **fully-automated** multi-period analysis function using the **CLEANest / SLICK** method by Grant Foster

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Analyse photometric time series in search for periodic **transits by exoplanets**, using the **EEBLS **(Edge Enhanced Box-fitting Least Squares) method by Kovacs. Calculate and visualize the EEBLS frequency spectrum, fold the time series over the most significant EEBLS period, calculate the epoch of mid-transit events, the transit depth and duration and graphically display the fit obtained by the EEBLS method.

Lower left: EEBLS period window showing the transit period

Upper right: Phase window folded over transit period with EEBLS fit

Lower right: binned Phase window using 25 observations per bin

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Determination of **period error** values (uncertainties) based on a method by Schwarzenberg-Czerny

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Sophisticated calculation of **False Alarm Probabilities** to determine the **period significances**, using a Fisher Randomization method (Monte-Carlo permutations)

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Powerful data and image **export** capabilities (to file or to clipboard)

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"**One-button-Save**" to store all analysis windows on disk and to continue your work in identical conditions at a later stage

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Toolbars, cursors and indicators let you select prominent periods, indicate intervals for refinement of your period analysis, etc

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Easy navigation bar to step through and zoom in on Observation sets. **Scroll buttons** allow you to pan a light curve.

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