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The second Gaia data release is scheduled to happen at Noon CEST tomorrow, 25 Apr 2018.

It'll include positions for 1,692,919,135 stars.

Information about Gaia is available at http://sci.esa.int/gaia/
and about DR2 at https://www.cosmos.esa.int/web/gaia/dr2

According to the DR2 Media Kit, which is available at http://sci.esa.int/gaia/60174-media-kit-for-gaia-data-release-2/

The press event about the Gaia Data Release 2 is being organised by ESA at
the ILA Berlin Air and Space Show in Germany on Wednesday 25 April 2018,
11:00–12:15 CEST.

The event will be streamed live at: http://www.esa.int/live  

Yes, it is 9.1 GB data. 97 million stars.

Added after 53 seconds:
There is a bigger one with 600 million stars.

Added after 32 seconds:
https://zah.uni-heidelberg.de/institutes/ari/gaia/outreach/gaiasky/downloads/#dr2catalogs

Thanks for let us know when DR2 is now available. I did downloaded Gaia Sky package and Gaia DR2 archives.

I executed Gaia Sky with default package. Very interesting! It immediately resulted image of Milky Way cloud from particles database!

I am now learning how Gaia Sky handle very large particle database with octree files. They are written in Java language.

Tim