R Monocerotis is a red giant star located in the constellation of Monoceros, approximately 1,500 light-years away from Earth. It is classified as a variable star, meaning its brightness changes over time. This star is part of a group known as the M-type stars, which are characterized by their cool temperatures and reddish hue. The name "R Monocerotis" refers to its designation in the Henry Draper Catalogue, a system used to classify stars. As a red giant, it has expanded and cooled after exhausting the hydrogen in its core. This transformation is a common stage in the life cycle of stars similar to our Sun.