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)
8/6/2025 4:18:54 PM

VarAstro Data Statistics

Objects last month

21

Objects in database

62355

Observations last month

159

Observations in database

82518

Minima last month

68

Minima in database

304209

Transits last month

82

Transits in database

16731

Active observers last month

45

Observers in database

1580

Most active last month

Yves Jongen

Most observed last month

TrES-3