About VarAstro

Welcome to VarAstro, unique portal for publication and sharing of photometric data running by Czech Astronomical Society, Variable Star and Exoplanet Section. The portal is a successor of famous web var.astro.cz ran for last two decades, Exoplanet Transit Database (ETD) and O-C gateway.

User Info

Most of functionality of VarAstro is available for logged users. If you don't have logging credentials, you can create your own new account free of charge. If you had an account at portal var2.astro.cz, use the same e-mail address as a login and you can migrate all your data easily to the new portal. | Login, Register

Object search

Star catalog

Enter full or partial star name
Or enter equatorial coordinates (J2000.0)

Exoplanet catalog

Enter full or partial exoplanet name
Or enter equatorial coordinates (J2000.0)
10/20/2025 8:54:47 PM

VarAstro Data Statistics

Objects last month

73

Objects in database

62317

Observations last month

436

Observations in database

83349

Minima last month

233

Minima in database

304819

Transits last month

199

Transits in database

17082

Active observers last month

56

Observers in database

1669

Most active last month

Yves Jongen

Most observed last month

QS Vir