Open Access

Table 1

Properties of the current (post-2019) H.E.S.S. instruments.

Instrument property CT1-4 value CT5 value
Optical design Davies-Cotton Parabolic
Focal length 15m 36 m
Mirror diameter 12 m (hexagonal) 28 m (circular equivalent)
Number of pixels 960 1758
Pixel size (On Camera) 42 mm 50 mm
Pixel size (On Sky) 0.16° 0.067°
Average field of view 5.0° 3.4°
Optical PSF ∼0.022−0.035° ∼0.022°

Notes. The optical point spread function (PSF) for each telescope varies, depending on the time since the last mirror alignment.

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