ESO 1.52m + B&C Grating Angle

Wavelength -->Grating Angle

grating #
diff. order
Central Wavelength (in nm)
Lower Wav. (nm)	Upper Wav. (nm)
Slit width

You can either enter the central wavelength or one of the limits (lower or upper). If you give both lower and upper limits, the mean value will be used as central wavelength. If you give all the three wavelengths, the Central wavelength will be used. Finally, you can enter a slit width (in arcsec, pixels, µm, nm or km/s) to know its projection on the CCD (or reverse).
µm = real slit width (the value you need to set when defining an exposure on the HP1000; min=114 max=1055);
pixels = slit width as projected on the CCD in pixels;
arcsec = slit width as projected on the CCD in arcsec;
nm = instrumental FWHM in nm.;
km/s = instrumental sigma in km/s. In output, the instrumental sigma computed at the center of the spectral range and at the blue and red edges is given.

Last Update: July 2000	Validate Page	2p2 Team	La Silla	Comments: 2p2team@eso.org