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28 Feb 2005
It has recently been determined that all spectral flats using the low resolution 10um grating obtained prior to Feb 27, 2005 were saturated. This means that:
- all unratioed spectra that have been flatfielded prior to then have incorrect spectral shapes;
- all spectra of extended sources that were ratioed by spectra of a point source (std) have incorrect shapes.
These differences are not huge, but are noticeable.
The following letter is being circulated to the Gemini community as of September 14, 2004.
Jean-Rene Roy, Associate Director Gemini North
29 May 2003
13 Mar 2003
Michelle is on Gemini and will have one final night of alignment tests on March 17, prior to being removed from the telescope for about three months. During that period it is expected that the dead array channel will be revived and the internal optical alignment will be adjusted/improved. In addition, there will be work done at the telescope to increase the cooling efficiency and thereby reduce the detector temperature.
Last update March 13, 2003; R. S. Fisher & T. R. Geballe
With the possibility of dangerous conditions associated with the Pacific hurricane Flossie, the Gemini Observatory offices in Hilo, Hawaii and the facilities on Mauna Kea will be closed on Monday night and Tuesday (day and night).
For more information on the current status of the storm see the Central Pacific Hurricane Center: http://www.prh.noaa.gov/cphc/tcpages/FLOSSIE.php
Updates will be provided here as circumstances require and allow.
The NIRI near-IR science detector is a 1024x1024 Aladdin InSb array with 27 micron pixels and sensitive from ~1 to 5 microns made by Raytheon/Santa Barbara Research Center. The camera lenses focus the telescope beam onto the detector with precise focussing being achieved by a translational focus stage upon which the array is mounted. The photo below shows the Aladdin array mounted on this focus stage.