Variable Star and Exoplanet Section of the CAS

Science may be hidden
in every astronomical image.

Evolution of the light echo of V838 Monocerotis · Credit: NASA/ESA/Hubble Heritage Team.

Year founded
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Observation

Quick access to astronomical equipment, processing, information sources, manuals, and observation programs.

varastrologonew 400 | Introduction
Observation database

Move to our database server with one click to plan and submit your observations.

SPHE ČAS
Membership and support

Do you want to become a member? Do you want to get involved? Step right in, please…

ROST Section Telescope

One click to ROST.

Hvězda z poloviny vyplněná
About variable stars

Direct access to professional information about variable stars and exoplanets, observation, and how to get started.

Observation programs

These are no longer just programs, but rather areas where to direct observations. Where and how to choose an observation target? That is here too.

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The Variable Star and Exoplanet Section of the CAS has a new website. You will
11. 8. 2026
screenshot 2026 08 11 195549 | Introduction
The planned summer service mission at ROST was changed to a cleaning-only mission. ROST is
18. 7. 2026
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This weekend, from April 10 to April 12, 2026, a major meeting of the CAS
12. 4. 2026
Friday
04
December 2026
Fyzikální ústav AV ČR, Praha 8

Number of participants: 6

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Are you interested in variable stars and exoplanets?

Join us, or participate in our events

Learn more about us here.

How to start? Get to know variable stars.

Where to find us?

The Variable Star and Exoplanet Section of the CAS has been bringing together amateur and professional observers from Czechia and Slovakia since 1924. We coordinate observations of variable stars and exoplanet transits, and we operate the VarAstro database and the CzeV catalog. Data from our observers are included in professional publications, helping to develop astrophysics; some even contribute to the preparation of space missions.

What defines us

Connecting amateurs with professionals
Discovering new variable stars
Turning backyards into observatories
Turning amateurs into discoverers
Teaching how to observe, measure, and publish
Passing on experience
Our database serves the world
Measuring stars for over 100 years
Researching multiple systems
Our data will outlive us

Our supporters