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Observing Overheads

Current estimates are that the overheads associated with each new science target (for target acquisition, telescope, WFS and instrument re-configuration etc) depend upon the guide configuration chosen for the observation.

Setup times for various observation types are:

Sensitivity and Overheads

This section contains information on the sensitivity and performance of NIFS in its various observing modes. Go directly to:

GNIRS Properties

GNIRS Optical Properties

All links will need updating when GNIRS pages are in place

The optical elements of GNIRS (e.g. cameras, gratings, cross-dispersing prisms and slits) are described in detail on the GNIRS components (broke) pages.

T-ReCS Properties

T-ReCS Optical Properties

The optical elements of T-ReCS (e.g. windows, filters, gratings and slits) are described in detail on the T-ReCS instrument pages

Acquisition Camera Properties

Acq Cam Optical Properties

The optical elements of Acquisition Camera (e.g. filters) are described in detail on the Acq Cam pages.



Acq Cam Detector Properties

Detector read noise: typical noise characteristics are given on the Acq Cam pages. The ITC currently adopts a fixed value of 6e-.

GMOS Properties in the ITC

GMOS Optical Properties

The optical elements of GMOS (e.g. filters, gratings and slits) are described in detail on the main GMOS pages.

Observing Condition Constraints in the ITC

The observing condition constraints define the poorest conditions under which a queue-scheduled observation should be executed and indicate the conditions that can be expected by classically-scheduled observers. See the detailed translation between frequency of occurrence (the %-ile bin) and physical property, which is a function of observing wavelength and zenith distance of the source.

Telescope Properties

This page describes some telescope properties relevant to ITC calculations. See the Gemini telescope pages for more details.

Mirror coating

The Gemini coating chamber is capable of depositing either alumini(u)m or silver. Currently the primary, secondary and tertiary (science fold) mirrors on both telescopes are silver coated. This graph shows the reflectivity of Al and Ag.