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<<>> Among the components of the infrared and submillimetre sky background,the closest layer is the thermal emission of dust particles and minor bodies inthe Solar System. This contribution is especially important for current andfuture infrared and submillimetre space instruments --like those of Spitzer,Akari and Herschel -- and must be characterised by a reliable statisticalmodel. <<>> We describe the impact of the thermal emission of main beltasteroids on the 5...1000um photometry and source counts, for the current andfuture spaceborne and ground-based instruments, in general, as well as forspecific dates and sky positions. <<>> We used the statistical asteroid model(SAM) to calculate the positions of main belt asteroids down to a size of 1km,and calculated their infrared and submillimetre brightness using the standardthermal model. Fluctuation powers, confusion noise values and number countswere derived from the fluxes of individual asteroids. <<>> We have constructeda large database of infrared and submillimetre fluxes for SAM asteroids with atemporal resolution of 5 days, covering the time span January 1, 2000 --December 31, 2012. Asteroid fluctuation powers and number counts derived fromthis database can be obtained for a specific observation setup via our publicweb-interface. <<>> Current space instruments working in the mid-infraredregime (Akari and Spitzer Space Telescopes) are affected by asteroid confusionnoise in some specific areas of the sky, while the photometry of space infraredand submillimetre instruments in the near future (e.g. Herschel and PlanckSpace Observatories) will not be affected by asteroids. Faint main beltasteroids might also be responsible for most of the zodiacal emissionfluctuations near the ecliptic.

The impact of main belt asteroids on infrared--submillimetre photometry and source counts