Europlanet Science Congress 2021
Virtual meeting
13 – 24 September 2021
Europlanet Science Congress 2021
Virtual meeting
13 September – 24 September 2021
EPSC Abstracts
Vol. 15, EPSC2021-112, 2021
European Planetary Science Congress 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Gaia spectroscopic view of the asteroid main belt and beyond

Marco Delbo1, Laurent Galluccio1, Francesca De Angeli2, Paolo Tanga1, Alberto Cellino3, Thierry Pauwels4, and Francois Mignard1
Marco Delbo et al.
  • 1CNRS-Laboratoire Lagrange, Laboratoire Lagrange, Nice, France (
  • 2Institute of Astronomy, University of Cambridge, Cambridge, UK.
  • 3Instituto Nazionale di Astrofisica, Osservatorio di Torino, Torino, Italy.
  • 4Koninklijke Sterrenwacht van Belgie, Brussel, Belgium
Asteroids reflectance spectra in the visible light will be one of the novel products of the Gaia Data Release 3 (DR3). These spectra are produced from Gaia observations obtained by means of the blue and red photometers — the so-called BP and RP, respectively. We will review the strategy adopted to produce asteroid reflectance spectra from BP-RP data, focusing on the choice of spectro-photometric calibrations computed taking into account solar system object astrometry and suitable lists of solar-analog stars.
Our preliminary investigation shows that we will be able to obtain reflectance spectra for asteroids as small as some km in the main belt, by exploiting the fact that each object has been observed multiple times by Gaia. We will show the capability of Gaia to probe the detailed compositional gradient of the main belt down to small sizes and to study correlations between spectral classes and other asteroid physical parameters, such as albedo and size.
Concerning the brightest asteroids, we expect to have substantial signal at wavelengths shorter than 450 nm, allowing Gaia to examine this region of the spectrum that has been poorly investigated by ground-based asteroid spectroscopic surveys. This region is characterised by the presence of a reflectance downturn that is diagnostic for the composition of classes of primitive asteroids, for instance those including the parent bodies of carbonaceous chondrites. These asteroids may have played an important role for the delivery of prebiotic compounds to Earth during the early phases of solar system' s history and, as such, are at the center of attention of the planetary science community. 

How to cite: Delbo, M., Galluccio, L., De Angeli, F., Tanga, P., Cellino, A., Pauwels, T., and Mignard, F.: Gaia spectroscopic view of the asteroid main belt and beyond, European Planetary Science Congress 2021, online, 13–24 Sep 2021, EPSC2021-112,, 2021.

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