Free Access
Table 13.
Geometric factors of the SIS telescope.
| Element | SIS-A | SIS-B |
|---|---|---|
| Entrance aperture diameter | 4.0 cm | |
| Stop foil aperture diameter | 4.0 cm | |
| Separation of Entrance aperture and Stop foil | 20.775 cm | |
| Geometric factor before losses | 0.360 cm2 sr | |
| Acceptance cone full angle | 22.0° | |
| Transparency factor | 0.6121 | |
| Loss factor due to aperture reduction plate | 26.94% | 0.28% |
| Net geometric factor | 0.161 cm2 sr | 0.220 cm2 sr |
Notes. All but the last two properties are identical for both apertures.
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.