R Monocerotis

Stellar classification



  • X 1210
  • Y 68
  • Z -2744
→ Sol: 3,000

Object type

  • Herbig Ae/Be star
  • Star
  • Double or multiple star
  • Emission-line Star
  • HII region
  • Infra-Red source
  • Interstellar matter
  • Reflection nebula
  • Variable Star
simbad:V* R Mon


R Monocerotis (R Mon) is a T Tauri variable in the constellation Monoceros. The apparent magnitude of R Mon varies between 10 and 12 and the spectral type B8IIIe.

The star is located in a diffuse nebula called "Hubble's Variable Nebula" (NGC 2261). According to some astronomers, the "star" R Monocerotis is not more than a very bright concentration of gases within the nebula, and some sky catalogues and atlases do not list it as a star.

This article uses material from the Wikipedia article "R Monocerotis", which is released under the Creative Commons Attribution-Share-Alike License 3.0.