The Sigma Ori open cluster has been the focus of Osorio's team observations due to the age of the cluster which is approximately 3 to 8 million years, it also has little extinctions, its distance and it is observed to be rich and dense.
The Sigma Ori open cluster has been the focus of Osorio's team observations due to the age of the cluster (approximately 3 to 8 million years). The cluster also has few extinctions, its distance is convenient, and it is observed to be rich and dense.