The Infrared Space Observatory (ISO) was the world's first true orbiting infrared observatory. Equipped with four highly-sophisticated and versatile scientific instruments, it was launched by Ariane in November 1995 and provided astronomers world-wide with a facility of unprecedented sensitivity and capabilities for a detailed exploration of the Universe at infrared wavelengths.
European Space Agency, 1999, The Mid-Ir Spectral Energy Distribution Of Ir Luminous Galaxies Part 2, 1.0, European Space Agency, https://doi.org/10.5270/esa-6ngi7u3