Observing Information

Comparison with Suprime-Cam

  Suprime-Cam HSC
CCD Make and Model Hamamatsu S10892-01 Hamamatsu S10892-02
Number of CCDs 10 104 + AG 4 + AF 8
Pixel 15 micron square (0.2 arc-sec) 15 micron square (0.17 arcsec)
Field of View 34 arcmin x 27 arcmin 90 arcmin daiameter
Conversion Factor 2.5-3.7 e/ADU 3.0 e/ADU
Readout noise ~ 10 e TBD e
Readout time 18 sec 20 sec
Full well 150,000 e 150,000 e
Number of Filters 10 6
Filter Exchange Time 300 s 600 s (900 s while commissioning)


Mosaic Arrangement

There are 104 main science CCDs, f CCDs for auto guider and 8 CCDs for auto focus. 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). This estimate was too ouf of date.


Updated transmission information is shown below, 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 g, r, i, z band filter's result, respectively.


Transmission of the standard broad-band filters

Tx measureed at the center of the filter using F/2 beam are shown below. The absolute scale has error especially apparent in NIR.

Broad Band Filter

Filter Name Data
HSC-g Text
HSC-r Text
HSC-i Text
HSC-z Text
HSC-Y Text