SITELLE - Performance Summary
(the basics to prepare an observing proposal)
Interferometer
Number of ports 2
Maximal mechanical displacement $±$5 mm
Mirror motion limited resolution (2 cm$^{-1}$) Wavelength (nm) Resolving power
370 13500
400 12500
450 11110
500 10000
650 7690
800 6250
Modulation efficiency 365 nm: TBD
400 nm: TBD
450 nm: TBD
500 nm: TBD
600 nm: TBD
700 nm: TBD
800 nm: TBD
Median on-sky wavefront stability TBD (<10 nm expected)
OPD metrology laser Single 1550 nm laser diode
Calibration sources 543.5 nm HeNe laser & white light
Optics
Field of view 10.97' x 11.06' (camera A)
10.95' x 11.03' (camera B)
Mean pixel scale 0.321"
Orientation North is up, East to left
Field distortion Distance from center Camera A / Camera B
1.2' 0% / 0%
2.4' 0.12% / 0.09%
3.6' 0.42% / 0.44%
4.8' 0.88% / 0.93%
6.0' 1.67% / 1.71%
Image quality TBD (<0.7" expected for a 100 nm pass band, at image center, on lab measurements)
Cameras
CCD type E2V CCD231-42-x-F61, Grad 0, back illuminated, NIMO Four Output, deep depletion silicon
Number of detectors 2 (1 per port)
Detector size 2048 x 2064 pixels each
Prescan pixels 50
Cosmetic quality Defect type Camera A / Camera B
Point defects 0 / 0
Bright columns 0 / 0
Dark points 0 / 13
Dark columns 0 / 0
Traps (>200e$^{-}$) 0 / 1
Total points 0 / 13
Total columns 0 / 0
Crosstalk between channels Signal < 20,000e$^{-}$: < 1e$^{-}$ (0.005%)
Signal < 30,000e$^{-}$: < 20e$^{-}$ (0.07%)
Signal < 50,000e$^{-}$: < 50e$^{-}$ (0.1%)
Transfer constant No binning: 0.76$±$0.01 e$^{-}$/ADU
2x2 binning: 0.350$±$0.005 e$^{-}$/ADU (TBD)
3x3 binning: 0.35$±$0.01 e$^{-}$/ADU (TBD)
Digital encoding 16 bit
Pixel full well No binning: 49400$±$0.01e$^{-}$
2x2 binning: 22800 e$^{-}$/ADU (TBD)
3x3 binning: 22800 e$^{-}$/ADU (TBD)
Readout noise No binning: 4.1$±$0.8 e$^{-}$ (3.3$±$0.4 e$^{-}$, 1 outlier removed)
2x2 binning: 3.0$±$0.1 e$^{-}$
3x3 binning: 3.1$±$0.2 e$^{-}$
Regulation target temperature -110ºC
Photo response non-linearity TBD
Fringing TBD
Dark current < 2 e$^{-}$/pixel/hour (E2V value)
< 2 e$^{-}$/pixel/hour (E2V value)
Filters
Filter exchange time Maximum excursion (3 positions): TBD
Minimum excursion (1 position): TBD
Filters available SN1: 365-385 nm
link to all transmission curves SN2: 480-520 nm
SN3: 651-685 nm
C1: 385-490 nm
C2: 562-625 nm
Shutter
Shutter type Bi-stable shutter (zero power consumption in open or closed state)
Shutter accuracy TBD (jitter less than 5 ms expected from early testing)
Shutter maximum operation rate 1 Hz
Shutter expected lifetime 500,000 operations
Shutter opening time 22 ms
Observing
Observing mode Exclusively Queue Service Observing (QSO)
Dark/light time operation To be scheduled based on science requirements of approved projects
North safe physical pointing limit 45 degrees from zenith (+64.8 declination)
South safe physical pointing limit 53 degrees from zenith (-30.2 declination)
Operation pointing limit 45 degrees cone around zenith
Instrument rotation Fixed, within $±$6'
Maximum image cadence No binning: 3.25s/image
2x2 binning: 2.03s/image
3x3 binning: 1.28s/image
Data pre-processing ORBS processing pipeline at CFHT