R Monocerotis is at the bottom left of this photo. Credit: HST/NASA/JPL
Observation data Epoch J2000 Equinox J2000
Constellation
Monoceros
Right ascension
06h 39m 09.954s[1]
Declination
+08° 44′ 09.56″[1]
Apparent magnitude (V)
11.85[2]
Characteristics
Spectral type
B8IIIev[3]
Variable type
T Tauri[2]
Astrometry
Distance
2600 ly (800[4] pc)
Details
Mass
~2–10[5]M☉
Age
~105 yr[5] years
Other designations
R Mon, BD+08°1427, 2MASS J06390995+0844097, NGC 2261[2]
Database references
SIMBAD
data
R Monocerotis, abbreviated R Mon, is a very young binary star[5] system in the equatorial constellation of Monoceros. The apparent magnitude of R Mon varies between 10 and 12 and the spectral type is B8IIIe.[3]
A visual band light curve for R Monocerotis, plotted from ASAS data[6]
This is a massive Herbig Ae/Be star, a type of pre-main-sequence star that is surrounded by an orbiting circumstellar disk of gas and dust. This disk has a mass of ~0.007 M☉ and extends outward to a distance of under 150 AU from the host. Because of this dust, the star is obscured from direct visual sight but can still be observed in the infrared.[5] R Mon is still in the accretion phase of star formation and it is driving an optically opaque bipolar outflow with a velocity of 9 km/s. The northern flow is blue-shifted, and thus moving more toward the Sun.[7] There is a T Tauri-type stellar companion at an angular separation of 0.69″ from the primary.[5]
This system is located in a diffuse nebula called "Hubble's Variable Nebula" (NGC 2261), which is being illuminated by a conical beam of light from the primary.[5]
^ abCite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
^ abcCite error: The named reference SIMBAD was invoked but never defined (see the help page).
^ abCite error: The named reference Mora_et_al_2001 was invoked but never defined (see the help page).
^Cite error: The named reference Manoj2006 was invoked but never defined (see the help page).
^ abcdefCite error: The named reference Fuente_et_al_2006 was invoked but never defined (see the help page).
^Cite error: The named reference ASASServer was invoked but never defined (see the help page).
^Cite error: The named reference Sandell_et_al_2020 was invoked but never defined (see the help page).
RMonocerotis, abbreviated R Mon, is a very young binary star system in the equatorial constellation of Monoceros. The apparent magnitude of R Mon varies...
V838 Monocerotis (Nova Monocerotis 2002) is a spectroscopic binary star system in the constellation Monoceros about 19,000 light years (6 kpc) from the...
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with the naked eye. Alpha Monocerotis has a visual magnitude of 3.93, while for Gamma Monocerotis it is 3.98. Beta Monocerotis is a triple star system;...
Z.; Masson, C. R.; Zuckerman, B.; et al. (October 1986). "Small-scale structure of the circumstellar gas of HL Tauri and RMonocerotis". The Astrophysical...
the constellation Monoceros. The nebula is illuminated by the star RMonocerotis (R Mon), which is not directly visible itself. The first recorded observation...
73 5.85 489 K0V has two planets (b & c) and one unconfirmed planet (d) R Mon R 06h 39m 09.95s +08° 44′ 10.8″ 11.85 B0 in NGC 2261; Orion variable BN Mon...
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star VY Tauri", ApJ 360 (1990) 639–649 "The Structure and Spectrum of RMonocerotis", ApJ 152 (1968) 439 "The Spectra of Two Nebulous Objects Near NGC 1999"...
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the constellation of Monoceros, less than a degree to the ESE of Delta Monocerotis. It is informally known as the Butterfly Nebula. The nebula is bright...
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in front of a faint emission nebula containing hydrogen ionized by S Monocerotis, the brightest star of NGC 2264. The faint nebula is approximately seven...
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