ε Monocerotis, Latinised as Epsilon Monocerotis, is the

Bayer designation A Bayer designation is a stellar designation in which a specific star is identified by a Greek or Latin letter followed by the genitive form of its parent constellation's Latin name. The original list of Bayer designations contained 1,564 stars. ...

of a

binary star A binary star is a system of two stars that are gravitationally bound to and in orbit around each other. Binary stars in the night sky that are seen as a single object to the naked eye are often resolved using a telescope as separate stars, in wh ...

system in the equatorial

constellation A constellation is an area on the celestial sphere in which a group of visible stars forms Asterism (astronomy), a perceived pattern or outline, typically representing an animal, mythological subject, or inanimate object. The origins of the e ...

Monoceros. Its location is a guide for sky navigation toward the Rosette Nebula. The white-hued primary component has a

stellar classification In astronomy, stellar classification is the classification of stars based on their stellar spectrum, spectral characteristics. Electromagnetic radiation from the star is analyzed by splitting it with a Prism (optics), prism or diffraction grati ...

of A5 IV, suggesting it is an aging subgiant star. Its apparent magnitude is 4.39 and it is approximately 122 light years away based on parallax. It is reportedly a spectroscopic binary with a period around 331 days.Vizier catalog entry
/ref> The B component, at a separation of around 12.3", is a yellow-white hued F-type main-sequence star of class F5 V and an apparent magnitude of 6.72.

References

{{DEFAULTSORT:Epsilon Monocerotis A-type subgiants F-type main-sequence stars Binary stars Monoceros (constellation) Monocerotis, Epsilon BD+04 1236 Monocerotis, 08 044769 030419 2298