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)
8/28/2025 9:28:28 PM

VarAstro Data Statistics

Objects last month

24

Objects in database

62376

Observations last month

278

Observations in database

82757

Minima last month

149

Minima in database

304337

Transits last month

108

Transits in database

16820

Active observers last month

49

Observers in database

1611

Most active last month

Stanislav Daniš

Most observed last month

RT And