R Monocerotis

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R Monocerotis
R Monocerotis is at the bottom left of this photo.
Observation data
Epoch J2000      Equinox J2000
Constellation Monoceros
Right ascension 06h 39m 09.95s[1]
Declination +08° 44′ 09.7″[1]
Apparent magnitude (V) 11.85[2]
Spectral type B8IIIe[2]
Variable type T Tauri[2]
Radial velocity (Rv)12[2] km/s
Distance2600 ly
(800[3] pc)
Other designations
R Mon, BD+08°1427, GCTP 1550.00, NGC 2261, 2MASS J06390995+0844097
Database references

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.[4]

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.


  1. ^ a b Cutri, R. M. (2003). "2MASS All-Sky Catalog of Point Sources". VizieR On-line Data Catalog. Bibcode:2003yCat.2246....0C.
  2. ^ a b c d "R Mon". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 26 December 2016.
  3. ^ Manoj, P. (2006). "Evolution of Emission-Line Activity in Intermediate-Mass Young Stars". The Astrophysical Journal. 653 (1): 657–674. arXiv:astro-ph/0608541. Bibcode:2006ApJ...653..657M. doi:10.1086/508764.
  4. ^ Mora, A.; Merín, B.; Solano, E.; Montesinos, B.; De Winter, D.; Eiroa, C.; Ferlet, R.; Grady, C. A.; Davies, J. K.; Miranda, L. F.; Oudmaijer, R. D.; Palacios, J.; Quirrenbach, A.; Harris, A. W.; Rauer, H.; Collier Cameron, A.; Deeg, H. J.; Garzón, F.; Penny, A.; Schneider, J.; Tsapras, Y.; Wesselius, P. R. (2001). "EXPORT: Spectral classification and projected rotational velocities of Vega-type and pre-main sequence stars". Astronomy and Astrophysics. 378: 116. Bibcode:2001A&A...378..116M. doi:10.1051/0004-6361:20011098.

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