R Monocerotis

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

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 contain this star.

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