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FREQUENTLY ASKED QUESTIONS ABOUT PHOENIX ON GEMINI




Telescope: Gemini South
Wavelength range: 1 to 5 microns
Wavelength coverage: 0.51 percent = 1500 km s-1
Limiting magnitude: ~14 at K and H at S/N~10 in 1 hour. Untested on Gemini.
(Also see Exposure Time Calculator.)
Throughput: slitless ~13 percent
Slit loss: Geometric with plate scale and seeing
Slit width: 2 pixel = 0.17", 4 pixel = 0.35"
Slits available: 2, 3, 4 pixel, no slit (i.e. open), 2 pixel pin hole
Slit length: 14"
Resolution: 2 pixel ~ 75000, 4 pixel = 50000
Inverse Linear Dispersion: wavenumbers per pixel = wavenumber /[1.11 x 105 tan (grating angle)]
Flexure: TBD on an alt-az telescope.
~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: IRAF images, easily converted to FITS
Acquisition: IR imaging mode, field of view 14", image through order sorting filters
Guiding: The visible/ir dichroic will not be used at Gemini.
Guiding will be done by Gemini guide probes.
Instrument scientist: Ken Hinkle (hinkle@noao.edu; 520-318-8298)


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National Optical Astronomy Observatories, 950 N. Cherry Avenue, P.O. Box 26732, Tucson, AZ 85726, Phone: (520) 318-8000, Fax: (520) 318-8360

Updated: 10Sep1999