JANUS




PI: P.Palumbo (Universita’ Parthenope, Napoli, Italy)

CoPI: R.Jaumann (DLR, Berlin, Germany)

Deputy PI & Instrument Scientist: G.Cremonese (INAF-OAPD, Padova, Italy)

Instrument Scientist: H. Hoffmann (DLR, Berlin, Germany)

National Team Leaders: L.M.Lara (CSIC-IAA, Granada, Spain), A.Holland (Open University, Milton Keynes, UK)




JANUS (Jovis, Amorum ac Natorum Undique Scrutator) is the visible camera on board the ESA mission JUICE (JUpiter ICy moon Explorer).

JUICE will fully characterize Ganymede as a planetary object and will carry out through investigation of the Jupiter system, including Europa, Callisto, enhancement of spatial and temporal coverage of the Jovian atmosphere and the other components of the Jovian system.

The man goals of JANUS can be summarized as follows:






The instrument characteristics and expected performances are reported in the following table.


Parameter

Unit

Value / Description

Notes

Type of optics

N/A

Catoptric

Off-axis aplanatic three-mirror design

Type of camera

N/A

Matrix scanner

 

Aperture dia

mm

100


FOV

°

1.72 across track

1.30 along track

Allows swath of about 15 km from 500 km and 3 104 km from 106 km

IFOV

mrad

15

Allows GIFOV of 7.5 m/pix from 500 km, 3 m/pix from 200 km and 15 km/pix from 106 km

Spectral range

nm

350-1050

Optical quality parameters met on a wide wavelength range; sensitivity at 1064 to allow cross-calibration

Filters

#

13






MTF at Nyquist frequency

%

64

worst case in the field

Binning

N/A

2x2, 3x3, 4x4, 6x6, 8x8

Increase instrument flexibility to cope with data volume limitation and frame rate in all obs. phases

Windowing

N/A

Any dimension and position

Same as above;

Compression factor

N/A

1 to 28

Values considered for nominal operations: 3 ¸ 7. Wavelet

Max acquisition rate

Mpix/s

2

Through compression unit