Spanish Virtual Observatory

Grant PID2020-112494GBI00 funded by

I Escuela Latinoamericana de Observatorio Virtual


14-15-16 marzo de 2023


It is important to have installed beforehand in your laptops the VO-tools to be used in the School, namely: 


************* IMPORTANT NOTE *************

The normal topcat/stilts web pages are down. While they are getting back on
their feet, the following alternatives have been set up:

The topcat application for Java and MacOS can be accessed at:



The topcat and stilts web pages can be found at: 

   TOPCAT web page:

   STILTS web page:

These are provided as zip files which you can unzip and point your browser at (use the top-level
index.html file as the entry point).


  • ALADIN: Download the Aladin.jar file (Linux users only) and execute it from a terminal using “java -jar Aladin.jar”. MacOS and Windows users: download the suitable files here. Aladin is compatible with Java releases from Java release 1.7 to the last one. More information here.

  • TOPCAT: Download the topcat-full.jar file and execute it from a terminal using “java -jar topcat-full.jar” (Linux and Windows users. For windows users, double-click on the topcat-full.jar file may also work ). MacOS users: download the suitable file here. TOPCAT is written in the Java language using the Java 2 Standard Edition version 8, and should run on any Java SE 8 or more recent system. See the documentation here.

  • VOSA: Web server (you don't need to install anything). All participants must register in advance.

  • STILTS: Download the stilts.jar file. MacOS users may need to install JDK to be able to run STILTS. See the documentation here.

  • Python: The tutorial #4 is designed to be followed using the web service Google Colab, an easy-to-use Jupyter Notebook environment hosted in Google's cloud (no Python installation required in local computer). Requirements: to have a Google account and download and extract the files included in Please, do it before the tutorial.

    For the participants who would like to follow the tutorial in their own Python & Jupyter Notebook environment, the requirements_march2023.txt file includes the Python packages that need to be installed before the tutorial. Using pip, you can install the packages using the command "pip install -r requirements.txt" (when the packages are installed, please check the import cell of the notebook is working). If you experience problems when installing the Python packages in your own environment, please, contact

 For a correct developement of the school, we encourage all participants to test Aladin, TOPCAT and STILTS following this short video and using this file.



Day 1. Tuesday 14 March (15:50h - 18:35h) (Central European Time)

  • 15:50 - 16:15 Reception of participants. Check that everything (zoom, video, audio,...) is working well.

  • 16:15 - 16:45 Introduction to VO and the School (Enrique Solano). Recorded session

Host: Patricia Cruz

Tutor: M. Cruz Gálvez
Backup tutors:Raquel Murillo, Pedro Mas, Belén López, Miriam Cortés


Day 2. Wednesday 15 March (15:50h - 20:15h) (Central European Time)

  • 15:50 - 16:15 Reception of participants. Check that everything (zoom, video, audio,...) is working well.

  • 16:15 - 18:05 Tutorial #2: Determination of the distance to the Pleiades cluster using TOPCAT (PDF)Recorded session

Host: Patricia Cruz

Tutor: Francisco Jiménez

Backup tutors:Raquel Murillo, Pedro Mas, M. Cruz Gálvez, Belén López


Day 3. Thursday 16 March (15:50 - 18:35h)

  • 15:50 - 16:15 Reception of participants. Check that everything (zoom, video, audio,...) is working well.

Host: Alba Aller

Tutor: Pedro Mas

Backup tutors:Raquel Murillo, M. Cruz Gálvez, Francisco Jiménez, Ricardo Rizzo

  • 18:05 - 18:35 Feedback and open time for discussion (Enrique Solano)


  • Bonus material:

    • Exploring Gaia with TOPCAT and STILTS (PDF)

    • TOPCAT and Gaia DR3 (PDF)

    • Transient events exploration (PDF

    • Introduction to ADQL (PDF)

    • Discovery of Brown Dwarfs mining the 2MASS and SDSS databases using ADQL and TAP (PDF)

    • The CDS tutorial (PDF)

    • The CDS tutorial using Jupyter notebooks

    • Other VO tools and services (PDF)

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