Techniques d'observation spectroscopique d'astéroïdes
Techniques d'observation spectroscopique d'astéroïdes
Techniques d'observation spectroscopique d'astéroïdes
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78 CHAPTER 5. M4AST - MODELING OF ASTEROIDS SPECTRA<br />
Figure 5.1: M4AST logo and the aims of this project.<br />
tel-00785991, version 1 - 7 Feb 2013<br />
surveys for asteroid have made their data available online. However, there is no centralized<br />
database containing all the asteroid spectra 3 . Moreover, the exploitation of these data in terms<br />
of construction of mineralogical models, comparison to laboratory spectra, and taxonomy is<br />
treated individually by each team working in this field. While the spectral databases for asteroids<br />
have become significant in size and the methods for modeling asteroid spectra are now<br />
well-defined and robust, there are no standard set of routines for handling these data.<br />
I developed M4AST (Modeling for Asteroids), which is a tool dedicated to asteroid spectra<br />
[Popescu et al., 2012b, 2011, Birlan & Popescu, 2011]. The logo of this project and the aims<br />
are given in Fig. 5.1. M4AST was conceived to be available via a web interface (http://<br />
cardamine.imcce.fr/m4ast/) and is free for access to the scientific community.<br />
The flowchart of the M4AST project is presented in Fig. 5.2. This project consists of a<br />
database containing the results of the observational measurements and a set of applications<br />
for spectral analysis and interpretation. Additionally, we start up to build a tool dedicated to<br />
observations planing, already described in chapter 3. Bellow we discuss the spectral database<br />
and the modelling tools parts of M4AST.<br />
5.1 Spectral database<br />
The first component of the project is the spectral database. It contains the results of telescopic<br />
measurements for the reflectance spectra of different wavelength ranges (V - visible, NIR - near<br />
infrared, V+NIR - visible and near infrared) of the asteroids, and the observations logs.<br />
5.1.1 Structure of M4AST database<br />
The information in the database is organized into two type of files: permanent and temporary<br />
files. Additionally, there is a catalog to keep track of the permanent files recorded.<br />
3 Some of these data are archived within the Small Bodies Node of the Planetary Data System (http://pds.nasa.gov/)
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