Spectrophotometric properties of CoPhyLab’s dust mixtures

Feller, C; Pommerol, A; Lethuillier, A; Hänni, N; Schürch, S; Bühr, C; Gundlach, B; Haenni, B; Jäggi, N; Kaminek, M (2024). Spectrophotometric properties of CoPhyLab’s dust mixtures. Monthly Notices of the Royal Astronomical Society, 528(1), pp. 61-81. Oxford University Press 10.1093/mnras/stad3890

stad3890.pdf - Published Version
Available under License Creative Commons: Attribution (CC-BY).

Download (3MB) | Preview

Objective: In the framework of the Cometary Physics Laboratory (CoPhyLab) and its sublimation experiments of cometary surface analogues under simulated space conditions, we characterize the properties of intimate mixtures of juniper charcoal and SiO2 chosen as a dust analogue (Lethuillier et al. 2022). We present the details of these investigations for the spectrophotometric properties of the samples. Methods: We measured these properties using a hyperspectral imager and a radio-goniometer. From the samples’ spectra, we evaluated reflectance ratios and spectral slopes. From the measured phase curves, we inverted a photometric model for all samples. Complementary characterizations were obtained using a pycnometer, a scanning electron microscope and an organic elemental analyser. Results: We report the first values for the apparent porosity, elemental composition, and VIS-NIR spectrophotometric properties for juniper charcoal, as well as for intimate mixtures of this charcoal with the SiO2. We find that the juniper charcoal drives the spectrophotometric properties of the intimate mixtures and that its strong absorbance is consistent with its elemental composition. We find that SiO2 particles form large and compact agglomerates in every mixture imaged with the electron microscope, and its spectrophotometric properties are affected by such features and their particle-size distribution. We compare our results to the current literature on comets and other small Solar system bodies and find that most of the characterized properties of the dust analogue are comparable to some extent with the spacecraft-visited cometary nuclei, as well as to Centaurs, Trojans, and the bluest TNOs.

Item Type:

Journal Article (Original Article)


04 Faculty of Medicine > Pre-clinic Human Medicine > Institute of Anatomy
08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences
08 Faculty of Science > Physics Institute

UniBE Contributor:

Feller, Clément Xavier Louis, Pommerol, Antoine, Hänni, Nora Phillys, Bühr, Claudia, Haenni, Beat, Jäggi, Noah Victor, Kaminek, Marek


600 Technology > 610 Medicine & health
500 Science > 520 Astronomy
500 Science > 530 Physics
600 Technology > 620 Engineering




Oxford University Press




Dora Ursula Zimmerer

Date Deposited:

19 Feb 2024 12:19

Last Modified:

19 Feb 2024 12:19

Publisher DOI:






Actions (login required)

Edit item Edit item
Provide Feedback