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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…