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Table 1 Characteristics of UVI

From: Ultraviolet imager on Venus orbiter Akatsuki and its initial results

Observation target

Solar radiation scattered at cloud top

Optics design

Camera with off-axial catadioptric optics

Observational wavelength

283 and 365 nm

Field-of-view

12°

FOV per pixel

0.20 mrads

Spatial resolution

~ 200 m (periapsis)–76 km (60Rv)

Optics

F-number

16

Focal length

63.3 mm

Aperture size

39.89 mm (hood entrance)

Bandpass widths of the filters

14 nm

Detector

CCD

SiCCD (back-illuminated and full-frame transfer)

Pixel number

1024 × 1024 pixels

CCD control

Exposure time

4 ms–11 s

Data depth

12 bit

Weight (kg)

UVI-S

2.9

UVI-AE

1.2

Size

UVI-S

199 mm × 206 mm × 376 mm

UVI-AE

220 mm × 220 mm × 50 mm

Power (W)

Stand-by mode

17

FW movement mode

34

Observation mode

19