telluric lines

telluric lines

(tĕ-loor -ik) Absorption lines seen in the spectrum of a celestial object but due to components, such as water vapor, oxygen, or carbon dioxide, in the Earth's atmosphere. Telluric lines can be distinguished because they are generally narrower than solar or stellar lines, etc. In addition, they vary in strength with the position of the source and are strongest when the source is on the horizon.
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A month or two preceding opposition the earth was approaching the planet rather rapidly, at least rapidly enough for the water vapor absorption lines of the Martian atmosphere to be displaced (according to the Doppler-Fizeau principle) to the violet of the telluric lines.
We discussed finding charts, refraction, guiding problems, telluric lines, bias-, flatfield- and dark-correction images, shock fronts, excitation levels, ftp servers, USB extenders, FITS formats, and, and .