The Observatorio de Sierra Nevada (Sierra Nevada Observatory, OSN) is located at Loma de Dilar (2896 m altitude) in the Sierra Nevada mountain range, in the province of Granada, established in 1981. It is operated and maintained by the Instituto de Astrofísica de Andalucía (Institute of Astrophysics of Andalusia - IAA) and contains two Nasmyth telescopes with apertures of 1.5 and 0.9 metres.