Optical spectroscopy of comets using Hanle Echelle Spectrograph (HESP)

Observing the vibrational/rotational lines in a comet's optical spectrum requires high-resolution spectroscopy, as they are otherwise seen as a blended feature. To achieve this, we have obtained medium and high-resolution (R (\lambda/\Delta \lambda) = 30000 and 60000) spectra of several comets, including C/2015 V2 (Johnson), 46P/Wirtanen, 41P/Tuttle-Giacobini-Kres\'ak and 38P/Stephan-Oterma, using... Show more