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The filters listed below are used during spectroscopy for order-blocking and (with the exceptions of M, L, and XD) for acquisition. For acquisition they provide complete and unvignetted views of the acquisition "keyhole," whose dimensions are shown here.
TEXES is offered at Gemini North in semester 2013B, probably for one period totaling 10-15 nights in mid-October.
Proposals for TEXES time are encouraged to include one or more of the TEXES team.
One or more members of the team will be present during the blocks of time when TEXES is on Gemini North.
Observations with the TEXES instrument are taken somewhat differently than those of the regular Gemini instruments. The OT files for TEXES observations are rather simple and are used only for two purposes: first, they define the target position and the guide star; second, they indicate various basic items of the TEXES configuration (the cross-disperser, the total requested length of the observation, the slit orientation, the central wavelength).
This page guides you through the main steps and considerations for configuring TEXES observations in the Observing Tool:
ALTAIR with Natural Guide Star (NGS) or Laser Guide Star (LGS) is available with NIRI for imaging, subject to the limitations below, and with NIFS for IFU spectroscopy and coronography and with GNIRS for longslit spectroscopy. LGS + P1 "super-seeing" mode is commissioned for NIRI and NIFS, which allows nearly full sky coverage for targets with elevations >40 degrees from Gemini North. The mode is currently limited for GNIRS spectroscopy use due to flexure issues.
The Gemini North hardware maintenance is complete and the Observing Database is back online. Please submit a Help Desk ticket if you have encounter any problems.
2012 Feb 25
NIRI is available for queue and classical imaging observations.
Not all filters are available at any one time; check the filter list to see which are currently installed.
NIRI occasionally suffers from vertical striping and shifts in DC levels which can both vary from quadrant to quadrant. Details can be found here.
Previous News Items
The Gemini e-newscast #44 (Feb. 14, 2013) features:
- Infrared Supernova Spectroscopy
- GeMS/GSAOI Update
- Users’ Committee for Gemini
- GPI to Start Acceptance Testing
- Gemini North Shutdown Complete
- "Big" Winner of Australian Student Imaging Contest
GNIRS can be used for near-infrared (1.0-2.5µm) imaging science and is in fact quite sensitive. However, as a photometer/imager it has the following limitations.