HDS Exposure Time Calculator

Input flux spectrum

magnitude:	Power law	Spectral index: (S_nu ~ nu^{-alpha})
Redshift:	Blackbody	Temperature: K
	Template	(from the UVKLIB spectral library)

Instrument setting

Setup: ADC No ImRot Blue ImRot Red ImRot
For non-standard setups, use the grating with a central wavelength of A
(default selects the most appropriate grating for the wavelength range).

Messia: Messia4 Messia5
Binning: 1x1 2x1 2x2 2x4 4x1 4x4 (spatial x spectral)
Echelle grating angle: degrees. Detector rotation angle: degrees
Use a slit width of arcseconds in arcsecond seeing.

Exposure time: seconds.

Note1: Use HDS Echelle Format Simulator to check the detailed spectrum format with the desired instrument setting.

Note2: Since the template spectra cover a limited wavelength range, correct normalization of the spectrum may not be possible at high redshift.

Akito Tajitsu, 1 March 2005
Chris Simpson, 4 January 2002