Click on any image for a larger version The Rosette Nebula is a quite large (90×65 arcmin) emission nebula, located in the constellation Monoceros (Unicorn). It is usually referred to as NGC 2237, but the whole complex is composed of an open cluster (NGC 2244, Caldwell 50), which is responsible for the nebula’s central structure, … Continue reading NGC 2237. The Rosette Nebula. Caldwell 49