Notes

The constellation of Monoceros is relatively new in Western astronomy; it isn’t part of Ptolemy’s 48 constellations listed in his Almagest.
Among the 88 modern constellations, Monoceros is the 35th largest, occupying an area of 482 square degrees.
Monoceros is quite faint since it doesn’t have any stars brighter than magnitude 3.0.
The brightest star in Monoceros is Beta Monocerotis, which is a triple star system that has a combined visual magnitude of 3.74.
Currently, around 16 stars in Monoceros have been confirmed to host planets.
There is only one Messier object in Monoceros, the open cluster Messier 50.
There are two minor meteor showers associated with the constellation of Monoceros, the December Monocerids, and the Alpha Monocerids.
Some other notable stars in Monoceros are CoRoT-7 (which hosts super-Earth planets), Alpha Monocerotis, Gamma Monocerotis, Epsilon Monocerotis, S Monocerotis, V838 Monocerotis, Plaskett’s Star, and one of the nearest black holes to our Solar System, the A0620-00 binary star system.
The constellation of Monoceros hosts numerous interesting deep-sky objects, such as the Rosette Nebula, the Christmas Tree Cluster, the Cone Nebula, Hubble’s Variable Nebula, and the reflection nebula IC 447 among others.
The best time to observe stars and deep-sky objects in the constellation of Monoceros is during the month of February.
The constellation of Monoceros was introduced by the Dutch astronomer and cartographer Petrus Plancius, through the observations of Dutch navigators in the 17th century.
The constellation of Monoceros’ first appearance occurred on a globe created by Dutch astronomer and cartographer Petrus Plancius in 1612. It was later charted by German astronomer Jakob Bartsch as Unicornu, on his star chart of 1624.