Experiment
Title
Vis-NIR reflectance spectra of a mixture of Magnetite, NH4-Nontronite, Antigonite and Dolomite, pure, mixed with Water ice, during and after ice sublimation
DOI
10.26302/SSHADE/EXPERIMENT_OP_20200623_001
Data reference
Schroeder, Stefan; Poch, Olivier; Ferrari, Marco; DeAngelis, Simone (2019): Vis-NIR reflectance spectra of a mixture of Magnetite, NH4-Nontronite, Antigonite and Dolomite, pure, mixed with Water ice, during and after ice sublimation. SSHADE/CSS (OSUG Data Center). Dataset/Spectral Data. https://doi.org/10.26302/SSHADE/EXPERIMENT_OP_20200623_001
Publications
Type(s)
laboratory measurement
Description
This mixture was prepared as a spectral analogue for Ceres surface material. We measured the reflectance spectra (from 0.5 to 4 µm) of the mixture pure (at room temperature) and mixed with water ice particles (at 173 K), as well as during and after sublimation of the water ice under high vacuum (at 173 K). The spectrum of the surface obtained after sublimation exhibits a blue spectral slope.
Number of spectra
26
Variable type(s)
  • sample composition
  • sample abundance
  • constituent
Instrument
SHINE Spectro-Gonio bidirectional reflection Vis-NIR
Sample holder
Aluminum sample holder, closed by a sapphire window and cooled by a He cryostat in a vacuum chamber (Carbo-NIR)
Standard medium
vacuum
Observation mode
spectrum
Spectral range type(s)
Vis, NIR
Valid spectral range(s)
Min - Max ($nm$) Sampling ($nm$) Resolution ($nm$) Position accuracy ($nm$) Absorption edge
#1 500.0 - 660.0 20.0 3.2
#2 680.0 - 1380.0 20.0 6.3
#3 1400.0 - 2980.0 20.0 13.0
#4 3000.0 - 4180.0 20.0 26.0
Filters
Type Center/Edge ($nm$) Width ($nm$) Place
#1 long-pass filters of the spectro-gonio radiometer
Observation geometry
bidirectional
Observation mode
fixed angles
Incidence angle
0.0°
Emergence angle
30.0°
Azimuth angle
0.0°
Phase angle
30.0°
Resolution observation
4.1°
Comments
The spectro-radio-goniometer SHINE was used in Gognito mode, as described in Potin et al. (2018, https://doi.org/10.1364/AO.57.008279), section D.2. The illumination beam was focused on an area of 6 mm in diameter on the sample, in order to increase the signal-to-noise ratio of our measurements.
Illumination
Observation
Comments
partial polarization variable with wavelength (from monochromator grating)
Observation mode
single spot
Spatial resolution
6.0 $mm$
Date begin - end
2019-04-23 - 2019-04-29

Versions

Release date
2020-11-02 14:08:15 UTC+0000
Version (Date)
#1 (2020-06-26 09:24:51 UTC+0000, Updated: 2020-11-02 14:08:15 UTC+0000)