Gaia Data Release 1
Free Access

Table 1

Selected operating mode characteristics for the science instruments nominal CCD modes.

CCD mode Readout Readout Binning
frequency mode (Ser. × Par.)

SM 833 kHz Full Frame 2 × 2
AF1 400 kHz Window 2 × 1
AF 103 kHz Window 1 × 1, 12 × 1
BP 164 kHz Window 1 × 1, 12 × 1
RP 164 kHz Window 1 × 1, 12 × 1
RVS-HRa 172kHz Window 1 × 1, 10 × 1

CCD mode System Charge TDI gate
gain injection activation

SM low no permanent
AF1 low yes yes
AF low yes yes
BP low yes yes
RP low yes yes
RVS-HR high no no



It was originally planned to also use a low-resolution RVS mode (RVS-LR) for acquisition of fainter spectra. However, its use was discarded at the end of the commissioning phase owing to some small thermal instabilities introduced into the payload as a result of the constant sky-dependent reconfiguring of the detectors.

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