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HSC CCDs
The CCDs of HSC are fully-depleted-type 2048 × 4096 pixel CCDs manufactured by Hamamatsu Photonics KK (S10892-02).
The following plots show the typical quantum efficiency (left) and format (right) of the CCDs.
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There are 104 main science CCDs, which provide a 90 arcmin field-of-view in diameter, as well as 4 CCDs for auto guider and 8 CCDs for focus monitoring.
The CCDs are arranged on the focal plane with two different gaps of approximately 12 arcsec and 53 arcsec between neighboring CCDs.
The following figure shows the CCD arrangement.
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- The "SDO-ID" is an abbreviation of serial data output-ID, which consists of "T_BEEID"-"T_SDOID".
The "T_BEEID", "T_SDOID", and "DET-ID" are FITS header keywords.
- The "FRAMEID" of SDO-ID=0_{00–57} are HSCA?????X00 – HSCA?????X57, where X is even number (X = 0, 2, 4, 6, 8).
For SDO-ID=1_{00–57}, the "FRAMEID" are HSCA?????Y00 – HSCA?????Y57, where Y is odd number (Y = 1, 3, 5, 7, 9).
- For expample,
HSCA00000400 – HSCA00000457 : SDO-ID= 0_00 – 0_57
HSCA00000500 – HSCA00000557 : SDO-ID= 1_00 – 1_57
- As the data of AG CCDs are not stored and archived, you will get 112 CCD data (104 Science + 8 Focusing) as FITS files per one shot.
- Several of the CCDs include an anomaly in counts for a specific range of data which is not available as science data.
The following table shows the CCDs/channels that are not useful with the periods and FRAMEIDs of data that were affected by the anomaly.
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SDO-ID | DET-ID | channel | Period (UT) | Frame ID | Details |
0_43 | 094 | 2 | 2014/03/24 – | HSCA00020400 – | Link |
1_47 | 009 | 1 | 2014/04/03 – | HSCA00183600 – | Link |
2 | 2014/06/30 – | HSCA00343600 – |
3, 4 | Occasionally, not available after 2014/06/30 |
1–4 | Readout has been suspended since February 2018. |
1_53 | 000 | 3 | 2014/06/24 – | HSCA00226000 – | Link |
1_09 | 043 | 4 | 2016/04/1 – | HSCA06440000 – | Link |
0_20 | 033 | 3 | 2016/12/23 – | HSCA09224600 – | Link |
4 | 2016/11/22 – | HSCA08945600 – |
Last update: October 10, 2021
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