| Telescope: | KPNO 4 m, 2.1 m | |
|---|---|---|
| Wavelength range: | 1 to 5 microns | |
| Wavelength coverage: | 0.51 percent = 1500 km s-1 | |
| Limiting magnitude: |
~10 at K and H at S/N~10 in 1 hour on the 2.1 m.
(Also see Exposure Time Calculator.) | |
| Throughput: | ~9 percent (excluding telescope and slit losses) | |
| Slit loss: | Geometric with plate scale and seeing | |
| Slit width: | 2 pixel = 0.34", 4 pixel = 0.70" at 4 m 2 pixel = 0.7", 4 pixel = 1.4" at 2.1 m | |
| Slits available: | 2, 3, 4 pixel, no slit (i.e. open), 2 pixel pin hole | |
| Slit length: | 28" at 4m, 54" at 2.1 m | |
| Resolution: | 2 pixel ~ 75000, 4 pixel = 50000 | |
| Inverse Linear Dispersion: | wavenumbers per pixel = wavenumber /[1.11 x 105 tan (grating angle)] | |
| Flexure: |
~1 km s-1 per hour at high airmass on an equatorial telescope. | |
| Blaze angle/grating: | 63.4 degree, 31 groove per mm echelle. | |
| Order separation: | Order sorting filters (table and specifications ) | |
| Cross dispersed: | No | |
| Scattered light: | ~2 percent in cores of opaque telluric lines | |
| Detector Array: | Aladdin II InSb 1024 x 1024, 1024 x 256 used. 27 micron pixels | |
| ADU per electron: | 9.2 e- | |
| Dark current: | 0.15 e-/second | |
| Read noise: | 40 e- | |
| Computer control: | Wildfire | |
| Data format: | FITS | |
| Acquisition: | IR imaging mode with circular FOV equal slit length through order sorting filter | |
| Guiding: | Visible/IR dichroic | |
| Instrument scientist: | Ken Hinkle (hinkle@noao.edu; 520-318-8298) |
Updated: 2012 Feb