The ESSTE-JWST Coordinated Project will investigate the surface and compositional properties of a diverse and representative sample of primitive small bodies across the Solar System, with the main goal of studying if there exists a continuum from the inner main belt to the outer and icy trans- Neptunian region. The project will focus on the non-icy materials, mainly refractory, in the form of dry or hydrated silicates and complex organics, on the surface of primitive asteroids, Jupiter and Neptune Trojans, Centaurs, and trans-Neptunian objects (TNOs). To achieve this goal, we will primarily make use of data collected with the James Webb Space Telescope (JWST) in the frame of the DiSCo Large Program and other Cycle 1-3 programs led or coled by the Coordinator (University of Oviedo - Uniovi) and the IAC researchers, as well as from the JWST public database. This collaborative project, by combining the expertises of the two teams, will allow us to take a timely and significant step forward in the field of understanding the chemistry of small body surfaces in planetary systems. It has the potential to generate groundbreaking knowledge that could be further applied to space exploration, the study of exoplanets, disks, and the interstellar medium, as well as the exploitation of resources in space. It will also provide inputs to answer fundamental questions like how water was delivered to the Earth, and what was the role of these primitive objects in the development of life in our planet. Additionally, it will form new generations with integral training in the acquisition, analysis, and exploitation of data from very competitive facilities like the Webb and space missions. 

The MinHiCAP-2 project (IAC) aims to continue with our research work on primitive asteroids and comet-asteroid transitional objects. This is a continuation of our previous work (MinHiCAP, PID2020-120464GB-I100), with a special emphasis in the compositional analysis of primitive asteroids using the visible to infrared spectra we are obtaining with NIRSpec and the JWST, its extension to the UV with Gaia DR3 and data from the HST, and the participation of our group in missions OSIRIS-REx and Hayabusa2. OSIRIS-REx and Hayabusa2 already finished their work at primitive near-Earth asteroids (NEAs) Bennu and Ryugu, respectively, but there is still a lot of work to do in the analysis of the samples returned to Earth. These two primitive NEAs are believed to have their origin in the primitive collisional families of main asteroid belt. Therefore, by studying the samples, the families in the asteroid belt, and their connection with comets, asteroid-comet transitional objects, Trojan asteroids, and icy objects in the outer solar system (TNOs, and Centaurs), which are the aim of Subproject1, we will enhance and put into context the science return of the two missions. All this work will be done in the context of our Primitive Asteroids Spectroscopic Survey (PRIMASS), currently the largest spectral database of primitive asteroids, with more than 400 objects observed.