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Astrophysical Research Consortium - Apache Point Observatory

Astrophysical Research Consortium
Apache Point Observatory
3.5m Telescope

 

CorMass - Quick Information and Specifications

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This page last updated: July 6, 2006 - JMD
This page last checked: September 26, 2004 - JMD


Information in Yellow may not be correct or is missing for this instrument!!!


Brief Instrument Description

CorMASS (Cornell Massachusetts Slit Spectrograph) is a low-resolution (R~300) prism cross-dispersed NIR Spectrograph. It has been used on the Palomar Observatory 60-inch telescope, the Vatican Observatory 1.8-meter telescope, and the Magellan 6.5-meter telescope but resides at APO until further notice. CorMASS' 2-dimensional spectral format provides simultaneous coverage of the IJHK bands, from ~0.75 microns to 2.5 microns. A remotely operated flip mirror allows the use of a slit viewing mode for object placement on the 5.5 x 0.75 arcsecond slit. CorMASS science includes rapid classification of brown dwarfs, determining redshifts of heavily reddened AGN, Wolf-Rayet star spectroscopy, examining temporal variation of T Tauri star absorption and emission lines, carbon star spectroscopy, novae spectroscopy, characterization of ices on outer solar-system icy satellites, and has obtained an integrated spectrum of Earth from lunar reflected earthshine. Also available is Cormasstool, a spectral reduction widget- based IDL package modified from Spextool, written by Mike Cushing and Bill Vacca.


CorMass Quick  Information

  • CCD is a NICMOS3 256x256 CCD
  • CCD pixel size = 40µm pixels
  • CCD gain = 8.5 e-/ADU
  • CCD read noise = 43 e-
  • Quantum Effeciency ~70%
  • Dark Current: <1 e- / second
  • Pixel scale = 0.375"/pixel in slit mode, 0.105"/pixel in slit view mode
  • Full well depth: 300k e-
  • Saturation is at 40k, therefore try to keep counts < 20k
  • Installed filters (User selectable):
  • Available gratings (Observing Specialist installable):
  • Resolution: R ~ 300
  • Spectral Coverage: 0.6-2.5 micron (although efficiency is poor shortward of 0.75 micron)
  • Field of View: 0.75" x 5.7" in slit mode, 10" in slit view mode
  • Ks filter (slit viewer)
  • Minimum Exposure time: 0.7s
  • Readout Time: 1.4s