Change page style:
Changes and bugs (coded red, or black if fixed) within the Integration Time Calculator are listed below. See the main ITC page for a list of the most recent changes.
There are two modes available:
- Calculate the total signal-to-noise ratio (S/N) for an observation with the specified exposure time, number of exposures and sky subtraction method
- Calculate the total integration time to achieve the requested S/N for an observation with the specified exposure time and sky subtraction method
Each new calculation will post results into the same page. The results page can be printed and re-sized e.g. so that the ITC form and results are both visible on your screen.
Additional information is available for:
22 Feb 2006
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