During the week beginning Monday, August 3, 2026, and over the following weekend, there may be brief service interruptions due to data imports and database maintenance. Thank you for your understanding.
About VarAstro
Welcome to VarAstro, a unique portal for the publication and sharing of photometric data, run by the Czech Astronomical Society, Variable Star and Exoplanet Section. The portal is a successor to the famous website var.astro.cz, which ran for the last two decades, the Exoplanet Transit Database (ETD), and the O-C gateway.
User Info
Most of the functionality of VarAstro is available to logged-in users. If you don't have login credentials, you can create a new account free of charge. If you had an account on the var2.astro.cz portal, use the same email address as your login to easily migrate all your data to the new portal. | Login, Register
Object search
Star catalog
Exoplanet catalog
VarAstro Data Statistics
Objects last month
65
Objects in database
62656
Observations last month
425
Observations in database
97069
Minima last month
334
Minima in database
322440
Transits last month
74
Transits in database
18092
Active observers last month
63
Observers in database
1935
Most active last month
Martin Magris
Most observed last month
GJ 3236
