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Communication Dans Un Congrès Année : 2022

UV Albedo of Mercury measured by BepiColombo/PHEBUS

Jean-Yves Chaufray
François Leblanc
Eric Quémerais
Dimitra Koutroumpa
Rozenn Robidel

Résumé

Probing the Hermean Exosphere By Ultraviolet Spectroscopy (PHEBUS) is an ultraviolet spectrograph on board the Mercury Planetary Orbiter (MPO) of the BepiColombo mission. The main goal of the instrument is to measure the exosphere of Mercury and the albedo of the surface of the permanently shaded regions near the poles. BepiColombo will be inserted around Mercury in December 2025, but during the cruise phase, several opportunities to observe the illuminated surface of Mercury are possible. Such opportunities are important since these observations will not be possible during the nominal science phase when the spacecraft is close to Mercury. The first observation of the illuminated surface of Mercury by PHEBUS with the EUV detector (55 - 155 nm) was done on 10 Oct 2021 few days after the first flyby from a distance of 0.03 AU at a phase angle of 72°. The solar reflected spectrum is detected from ~80 nm to 160 nm. In this presentation, the UV albedo of Mercury derived from these observations will be presented and compared to the measurements by Mariner 10.
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Dates et versions

hal-03806988 , version 1 (08-10-2022)

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Jean-Yves Chaufray, François Leblanc, Eric Quémerais, Dimitra Koutroumpa, Rozenn Robidel. UV Albedo of Mercury measured by BepiColombo/PHEBUS. 44th COSPAR Scientific Assembly, Jul 2022, Athens, Greece. pp.Abstract B4.5-0003-22. ⟨hal-03806988⟩
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