Harvard University

Astronomy Lab and Clay Telescope


Day Labs | Evening Labs | Cloudy Day Labs | MaximDL/CCDOps Help

Taking Calibration Spectra

Whenever you take a spectrum, you need to take a spectrum of a calibration source so you can generate a wavelength solution. Calibration spectra are best taken immediately before or immediately after your object spectrum, while being sure not to bump or disrupt the spectrograph or telescope pointing. In our lab, we have a Mercury-Argon fiber fed calibration lamp. Since this lamp does emit some UV light, it is important not to look directly at the light source.