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Table 1
Parameters of the SODISM CCD camera.
| Parameter | Value (at −7.2 °C when relevant) |
|
|
|
| CCD type | E2V CCD 42-80 series |
| Flight CCD name and reference | Mehen, CCD#60 |
| Image zone format | 2048 × 2048 |
| Memory zone format | 2048 × 2052 |
| Pixel size | 13.5 × 13.5 μm2 |
| CTI at BOL | ≤ 10-6 |
| Saturation level | 77–111 ke− |
| Operating temperature in flight | −7.2° ± 0.1C |
| Expected dark current of non hot pixels | ~4 e− pxl-1 s-1 |
| Expected dark current of hottest pixel | 300 ke− pxl-1 s-1 |
| Gain of the left readout port (image bottom) | 4.22 μV/e− |
| Gain of the right readout port (image top) | 4.14 μV/e− |
| Overall gain of the readout chain (16 bit) | ~1.18 ADU16 bit/e− ⇒ 0.85 e−/ADU16 bit |
| Overall gain of the readout chain (15 bit) | ~0.59 ADU15 bit/e− ⇒ 1.685 e−/ADU15 bit |
| RN | Increasing from 15 e−rms at BOL, to 20 e−rms at EOL |
| Exposure time | 0.5–16 s |
| Integration time | is worth “exposure time” + 0.4 s |
| IZ–MZ frame-transfer duration | 369.46 ms |
| Line readout duration | 11.05 ms |
| Frame readout duration | ~22 s |
Notes. Abbreviations used in this table: Analog-to-digital unit (ADU), beginning of life (BOL), charge transfer inefficiency (CTI), end of life (EOL), image zone (IZ), memory zone (MZ), read noise (RN).
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