Free Access

Table 3.

IP (in percent of the total intensity) induced by the telescope mirrors and M4 before and after recoating of M1 and M3.

Date a (°) Y (%) J (%) H (%) Ks (%)
Before 87 0.58 0.42 0.33 0.29
16-04-2017 30 3.5 2.5 1.9 1.5

After 87 0.18 0.12 0.07 0.06
16-04-2017 30 3.0 2.1 1.5 1.3

Notes. The values are shown at optimal, nearly crossed configuration of the reflection planes of M3 and M4 (at a = 87°, with a the altitude angle of the Unit Telescope), and worst, close to aligned reflection planes (a = 30°: the lowest altitude at which the ADC can correct for atmospheric dispersion) for the IRDIS broadband filters.

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.