Probing of Hermean Exosphere by Ultraviolet Spectroscopy: instrument presentation, calibration philosophy and first lights results

Abstract : PHEBUS (Probing of Hermean Exosphere by Ultraviolet Spectroscopy) is a double spectrometer for the Extreme Ultraviolet range (55-155 nm) and the Far Ultraviolet range (145-315 nm) dedicated to the characterization of Mercury's exosphere composition and dynamics, and surface-exosphere connections. PHEBUS is part of the ESA BepiColombo cornerstone mission payload devoted to the study of Mercury. The BepiColombo mission consists of two spacecrafts: the Mercury Magnetospheric Orbiter (MMO) and the Mercury Planetary Orbiter (MPO) on which PHEBUS will be mounted. PHEBUS is a French-led instrument implemented in a cooperative scheme involving Japan (detectors), Russia (scanner) and Italy (ground calibration). Before launch, PHEBUS team want to perform a full absolute calibration on ground, in addition to calibrations which will be made in-flight, in order to know the instrument's response as precisely as possible. Instrument overview and calibration philosophy are introduced along with the first lights results observed by a first prototype.
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Jean-François Mariscal, Nicolas Rouanet, Jean-Luc Maria, Eric Quémerais, Pierre-Olivier Mine, et al.. Probing of Hermean Exosphere by Ultraviolet Spectroscopy: instrument presentation, calibration philosophy and first lights results. ICSO 2010 International Conference on Space Optics, 4 - 8 October 2010, Oct 2010, Rhodes, Greece. 6 p. ⟨hal-00625118⟩

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