Software Directory

Increasingly, software and data analysis are becoming the heart of what we do as astronomers, even amateur astronomers. More and more a lot of our data gathering is being handled by orbiting satellites and robotic telescopes. It is up to the human beings in the equation to analyze and interpret the results.

Here you will find a list of software that has been developed both by and for the AAVSO. This runs the spectrum from both data entry and data gathering software – still very important for what we do – and data analysis software to enable you to move forward and interpret the data you gather.

Data Entry Software

Observation Manager - Manage your observations and export them into the official Visual Format of the AAVSO. This software is written in Java so can run on any platform (Windows or MacOS). Created by Dirk Lehmann (LDI).

Excel Spreadsheet (Converts BAAVSS to AAVSO and VSNET formats) - by Gary Poyner
This Excel spreadsheet will take visual observations submitted in the BAAVSS format and export them to VSNET and AAVSO formats. Special thanks to Gary Poyner for providing this spreadsheet to the public.

Excel Spreadsheet (Creates AAVSO or VSNET format reports) - Erwin van Ballegoij's version of Gary Poyner's spreadsheet. Zipped files available as: Data_Entry.xls and Data_Entry.xlsx    (updated 23 September 2013)
Enter visual observations and export as AAVSO or VSNET format. Many thanks to Erwin for providing this spreadsheet.

A program that converts VSNET format observations to AAVSO format observations. You also can download the documentation as well as a the needed list of program stars.

OBSVAR V1.5 - Link to web page by Laurent Corp

OBSVAR.TXT - (Readme file)
This is a link to an observation planning tool created by Laurent Corp (CLZ). It will search the AAVSO or AFOEV Bulletins and extract data that meets different criteria such as Constellation, Month, Right Ascension, etc. The web page is in French and there is an English option available. This software is not officially supported by the AAVSO and any questions should be directed to the author.

Data Analysis Software

CLEANest - 3/10/2005
This is Visual Basic source code for the CLEANest and SLICK algorithms in TS. Cleanest is an effective method for removing false peaks from a power spectrum and can also describe and detect multiperiodic signals. (Foster G., AJ Vol 109, Nr 4, April 1995 "The cleanest Fourier spectrum")

LcTools - V16.0, 2/25/2020 by Allan R. Schmitt
LcTools is a Windows-based software system for building, viewing, and analyzing light curves for the TESS, K2, and Kepler projects. Signals of any type (dips or peaks, periodic or single events) may be detected and recorded automatically. See the published research paper and product description for more information.

PhasPlot 2.0 - Version 2.0 released 06/26/2009
PhasPlot is a Windows-based tool for plotting phase diagrams of variable star data. The user interface is designed to make it easy to test different periods on a star. PhasPlot is designed to work with data from the AAVSO International Database downloaded via the official form to download data without any reformatting of the data needed.

Windows software to display and analyse light curves using AAVSO data

Rcodes - Release Date: 7/15/2010
This set of software, in the statistical language "R," is meant to accompany Grant Foster's book, Analyzing Light Curves: A Practical Guide.

WinWWZ (Windows VB.Net)
A VB.Net based time-series analysis program used to study the time-evolution of variable star data, capable of measuring changes in period, amplitude, and mean magnitude. Click here for more information about WinWWZ.

VaST - 2/6/12
VaST (the Variability Search Toolkit) is a UNIX/LINUX based program designed by Kirill Sokolovsky aimed at finding objects of variable brightness on a series of astronomical images. The Tookit has been successfully used by several AAVSO members to aid in published analysis and the discovery of new variable stars.

VStar Release date: Current
A free, java-based, open-source variable star data analysis tool.

VStarModelPlot Release date: 11/30/2018
A supplementary tool for the VStar astronomical software to plot model equations (R-based). Written by Maksym (Max) Pyatnytskyy.

Solar Software

A Java-based data entry program for reporting sunspot counts to the Solar Section. Please use this for your reports.

Useful Windows Software

Software, by Bob Nelson
Programs range from finding times of minima to intermediate processing of spectral data (no IRAF!)

Educational Tools

Introduction to: AAVSO and How to Make a Visual Estimate
A 2.5 Megabyte powerpoint presentation created by Chuck Pullen, AAVSO member, that introduces you to the AAVSO and shows you how to estimate the magnitude of a variable star. There is also a Spanish translation of this presentation by Jaime Garcia: ¡Aprenda cómo divertirse haciendo observaciones de estrellas variables!
and a Chinese version by Tao Fan-Lin: 變星觀測練習

Gamma Ray Burst Presentation
A 3.5 Megabyte powerpoint presentation created by Chuck Pullen, AAVSO member, that introduces you to Gamma Ray Bursts and the AAVSO Gamma Ray Burst Network.

Software Affiliated With the AAVSO

Information on the UNIX planetarium software support for AAVSO light curves.

Software with AAVSO features

AstroPlanner: Astronomical Planning and Logging Software
A software application for Macintosh and Windows computers that facilitates astronomical visual observation planning and logging as well as control of Meade telescopes that use the LX200, LX200GPS or Autostar controllers, Celestron NexStar scopes, Astro-Physics GTO mounts, the Vixen SkySensor 2000 system , and several others. This item is shareware and costs $20 to register.

An application which is able to generate a finder chart for a given variable star (like planetarium software), is able to show the AAVSO observing chart with comparison stars, allows the recording of observations and generates reports in AAVSO format. Be sure to download the latest version.

Observing Aids

CHARA (Charting and Reporting Application) for Windows by Michael Poxon
For visual observers only currently. All-in-one observation tool which displays the user's charts, enters their details, and allows observations to be logged, generating a WebObs-compliant report. Other features include the facility to import one's past observations from AAVSO into the native database, which can then be used to view past observations (including of selected stars) as well as to create, edit or delete chart details. Black-and-white AAVSO charts can be displayed on-screen as red stars on black for night vision. Comes with help files (which you must read because charts have to follow a consistent naming pattern and so on). Feedback is welcome.

KMZ file for plotting AAVSO program stars in Google Sky or other apps
Download this file and open it in Google Earth/Sky or other sky viewing program that supports KML markup language. You will then have the option to turn on or off different AAVSO star lists (such as the Easy to Observe stars, Binocular Program stars, Legacy LPVs, etc.). Click on a star and you will find information about the star as well as handy links to charts and other information. Many thanks to Andrzej Armiński for creating this useful observing aid.

Lew Cook's AAVSO Format Plotting Workbook
Imagine the questions you might wonder about in even one night of observations! What does a particular variable star's light curve look like? Were there any cirrus clouds or smoke in the atmosphere during the observing run? Did the cirrus clouds materially affect the data quality? Is the Comparison star or checK star variable? What is the range in air mass? What are the extinction (absorption due to atmospheric absorption) coefficients? Do the (statistical) errors of the variable star measurements depend on the time, the degree of absorption and scattering of the comparison star, or is it due to the dimming of the variable, or due to more and more atmosphere as it got lower (at high air mass)? Does the color of the star affect its extinction (of course it does!)? How much?

The link above will take you to Lew's is a Workbook that plots out every piece of your data on the star in your run that night which will help you to answer these and many other questions.

Nemesis companion star remover for CCD photometry
Excel spreadsheet developed by Lew Cook

Signal-to-noise calculator for CCD photometry
Excel spreadsheet developed by Michael Newberry

Transforms: Everything you need to transform your CCD observations
This link will take you to a page that contains useful programs for both computing your transformation coefficients and applying the transforms to your observations. A prodigious amont of work has been done by volunteers Gordon Myers, George Silvis, and Richard Sabo to develop these tools.