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Mg Exosphere of Mercury Observed by PHEBUS Onboard BepiColombo During Its Second and Third Swing-Bys
Korablev, O.; Chaufray, J. -Y.; Leblanc, F. +6 more
Mercury's exosphere is an important target for understanding the dynamics of coupled systems in space environments, tenuous planetary atmospheres, and planetary surfaces. Magnesium (Mg) is especially crucial for establishing methods for estimating the surface chemical composition distribution through observations of the exosphere because its distr…
Mercury's Exosphere as Seen by BepiColombo/PHEBUS Visible Channels During the First Two Flybys
Reberac, A.; Korablev, O.; Leblanc, F. +10 more
BepiColombo, the ESA/JAXA joint mission performed its first flyby of Mercury on 1 October 2021 and its second on 23 June 2022. PHEBUS observed the exosphere of Mercury during these flybys notably with its visible channels c404 (centered on the potassium emission line at 404 nm) and c422 (centered on the calcium emission line at 422 nm). The c422 s…
The EUV Reflectance of Mercury's Surface Measured by BepiColombo/PHEBUS
Korablev, O.; Chaufray, J. -Y.; Leblanc, F. +10 more
On 9 and 10 October 2021, Probing the Hermean Exosphere by Ultraviolet Spectroscopy aboard BepiColombo observed the disk-integrated reflected light from the Sun by Mercury in the spectral range 90-160 nm at a phase angle of 70°. These observations are used to derive the EUV reflectance of the surface of Mercury in this wavelength range for the fir…
Observation of Helium in Mercury's Exosphere by PHEBUS on Bepi-Colombo
Korablev, Oleg; Belyaev, Denis; Chaufray, Jean-Yves +12 more
On 1 October 2021, Bepi-Colombo performed its first flyby of Mercury. During the maneuver, the short wavelength channel (55-155 nm) of "Probing the Hermean Exosphere by UV Spectroscopy" (PHEBUS) was activated for a total duration of 1 hr. The helium resonance line at 58.4 nm was clearly observed during the whole sequence. At large distance from th…
Global Spectral Properties and Lithology of Mercury: The Example of the Shakespeare (H-03) Quadrangle
Capaccioni, F.; Doressoundiram, A.; Perna, D. +4 more
The MErcury Surface, Space ENvironment, GEochemistry and Ranging mission showed the surface of Mercury with an accuracy never reached before. The morphological and spectral analyses performed thanks to the data collected between 2008 and 2015 revealed that the Mercurian surface differs from the surface of the Moon, although they look visually very…
Viscoelastic Tides of Mercury and the Determination of its Inner Core Size
Oberst, J.; Stark, A.; Steinbrügge, G. +3 more
We computed interior structure models of Mercury and analyzed their viscoelastic tidal response. The models are consistent with MErcury Surface, Space Environment, GEochemistry, and Ranging mission inferences of mean density, mean moment of inertia, moment of inertia of mantle and crust, and tidal Love number k2. Based on these constrai…