Observing Information
Comparison with Suprime-Cam
Suprime-Cam | HSC | |
CCD Make and Model | Hamamatsu S10892-01 | Hamamatsu S10892-02 |
Number of CCDs | 10 | 104 + 4 for auto guider + 8 for focus monitoring |
Pixel | 15 micron square (0.20 arcsec) | 15 micron square (0.17 arcsec) |
Field of View | 34 arcmin x 27 arcmin | 90 arcmin diameter |
Conversion Factor | 2.5-3.7 e/ADU | 3.0 e/ADU |
Readout noise | ~ 10 e- | ~ 4.5 e- |
Readout time | 18 sec | 18 sec |
Full well | 150,000 e- | 150,000 e- |
Number of Filters | 10 | 6 |
Filter Exchange Time | 300 sec | 600 sec (1800 sec incl. overhead) |
CCD
Mosaic Arrangement
There are 104 main science CCDs, 4 CCDs for auto guider, and 8 CCDs for focus monitoring. The gap between pixels on neigboring CCDs are about 1 mm (11 arc-sec). The bottom figures shows the actual CCD arrangement seen from the primary mirror.
Wide Field Corrector
Transmission Curve
Measured on the actual lens system averaged over six light paths (including on-axis and off-axis up to the edge)
Wavelength [nm] | Measured [%] | Sepcification [%] |
405 | 81.6 | > 70 |
633 | 91.4 | > 85 |
1064 | 87.7 | > 80 |
Measured from coating samples. All lens samples are multiplied (csv).
The following is the transmission information updated on June 12, 2014 (Data).
Optics Design
Designed performance (in FWHM) is shown in the figure below; ○ for HSC and □ for Suprime-Cam. Green, red, cyan and black shows the results of g, r, i, and z band filters, respectively.
Filter
Transmission of the standard broad-band filters
Filter Name | Data |
HSC-g | Text |
HSC-r (old r-band) | Text |
HSC-r2 (new r-band) | Text |
HSC-i (old i-band) | Text |
HSC-i2 (new i-band) | Text |
HSC-z | Text |
HSC-Y | Text |