A radial velocity spectrograph for zodiacal light

Astronomy and Astrophysics – Astronomy

Scientific paper

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Instrumentation: Spectrographs, Techniques: Interferometric, Interplanetary Medium, Dust, Extinction

Scientific paper

This is an account of the design of a radial velocity spectrograph for observing zodiacal light and similar extremely feeble extended sources with absorption spectra. The instrument is intended for making measurements of the radial velocity of the zodiacal dust particles, as a function of elongation and ecliptic latitude. A resolution of 3000 m s^-1 is shown to be feasible at a surface brightness of 3x10^-13 of the solar disc with an exposure time of 100s.

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