NIRC-2 General Specifications

The following tables have been taken partly from the original NIRC2 proposal by Keith Matthews and Tom Soifer, and partly from more recent information on the as-built instrument.
 

Input f/ ratio	f/15
Wavelength range	0.9-5.3 microns
Field of view	10x10 arcsec (narrow camera) 20x20 arcsec (medium camera) 40x40 arcsec (wide camera)
Pixel scale	0.009942 arcsec/pixel (+/- 0.00005") 0.019829 arcsec/pixel 0.039686 arcsec/pixel
Filters	J, H, K, Ks, Kp, Lp, Ms, H2, Fe II
Pupil mask	1 circular fixed, circumscribes the telescope pupil 1 circular rotating, inscribes the telescope pupil and masks the spiders 3 hexagonal, rotating
Slits	10, 20, 30, 40, 60, 80, 120, and 160 milliarcsec
Coronagraphic spots	circular: 100, 150, 200, 300, 400, 600, 800, 1000, 1500, 2000 milliarcsec
Grisms
Minimum frame time	0.25 sec, full frame
Detector	1024x1024 InSb Aladdin-3 array, 27 micron pixels  32 simultaneous outputs, grouped in 8 pixels across a row in each of 4 quadrants subarray capability 35 K operating temperature normal gain, 4 electrons/DN
Read noise	60 electrons per CDS read 15 electrons for MCDS with 16 reads
Dark current	< 0.1 electrons/pixel/sec
QE	80% at 1.7 microns
Well depth	~18,000 DN at 5% linearity

NIRC2 Master
10 October 2001