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)
6/9/2025 9:22:04 PM

VarAstro Data Statistics

Objects last month

34

Objects in database

62270

Observations last month

235

Observations in database

82053

Minima last month

305

Minima in database

303968

Transits last month

109

Transits in database

16547

Active observers last month

34

Observers in database

1502

Most active last month

Yves Jongen

Most observed last month

UCAC4 636-025480