Free Access

Table 1

Number of astrometric parameters per star estimated in the four astrometric solution scenarios.

Case A (optimistic) Case B (conservative)

Gaia 12 HTPM Gaia 12 HTPM

Hipparcos stars 5 5 2 5
Auxiliary stars 5 5 2 2

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.