Almost all massive stars explode as supernovae and form a black hole or neutron star. The remnant mass and the impact of the chemical yield on subsequent star formation and galactic evolution strongly depend on the internal physics of the progenitor star, which is currently not well understood. The theoretical uncertainties of stellar interiors accumulate with stellar age, which is particularly pertinent for the blue supergiant phase. Stellar oscillations represent a unique method of probing stellar interiors, yet inference for blue supergiants is hampered by a dearth of observed pulsation

Between August and December 2018, during the Approach and Preliminary Survey phases of the NASA OSIRIS-REx mission, a series of images and spectra of the surface of asteroid Bennu, target of the mission, was acquired. Images acquired with MapCam, using 5 different filters provide an average albedo (fraction of the light reflected by the surface of the asteroid) of about 4.5 %, consistent with the spectral type of Bennu as determined from ground-based observations, and in agreement with the results from OSIRIS-REx disk-integrated photometry. Such a dark surface and spectral behaviour are also