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)


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.


Transmission of the standard broad-band filters

Broad Band Filter

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