Beta Monocerotis
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) |
|
|---|---|
| Constellation | Monoceros |
| Right ascension | 06h 28m 49.0700s |
| Declination | −07° 01′ 59.025″ |
| Apparent magnitude (V) | 4.60 |
| Characteristics | |
| Spectral type | B3Ve |
| U−B color index | −0.63 |
| B−V color index | −0.10 |
| R−I color index | −0.16 |
| Astrometry | |
| Radial velocity (Rv) | 20 ± 5 km/s |
| Proper motion (μ) |
RA: −7.00 mas/yr Dec.: −4.97 mas/yr |
| Parallax (π) | 4.72 ± 1.10mas |
| Distance | approx. 700 ly (approx. 210 pc) |
| Absolute magnitude (MV) | −2.0 |
| Details | |
| Mass | 7 M☉ |
| Luminosity | 3,200 L☉ |
| Rotational velocity (v sin i) | 346 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) |
|
|---|---|
| Constellation | Monoceros |
| Right ascension | 06h 28m 49.424s |
| Declination | −07° 02′ 03.88″ |
| Apparent magnitude (V) | 5.40 |
| Characteristics | |
| Spectral type | B3ne |
| U−B color index | −0.52 |
| B−V color index | −0.07 |
| Astrometry | |
| Radial velocity (Rv) | 18 ± 5 km/s |
| Proper motion (μ) |
RA: −7.00 mas/yr Dec.: −4.97 mas/yr |
| Parallax (π) | 4.72 ± 1.10mas |
| Distance | approx. 700 ly (approx. 210 pc) |
| Absolute magnitude (MV) | −1 |
| Details | |
| Mass | 6.2 M☉ |
| Luminosity | 1,600 L☉ |
| Rotational velocity (v sin i) | 123 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) |
|
|---|---|
| Constellation | Monoceros |
| Right ascension | 06h 28m 49.613s |
| Declination | −07° 02′ 04.76″ |
| Apparent magnitude (V) | 5.60 |
| Characteristics | |
| Spectral type | B3e |
| B−V color index | −0.1 |
| Astrometry | |
| Radial velocity (Rv) | 23 ± 5 km/s |
| Proper motion (μ) |
RA: −7.00 mas/yr Dec.: −4.97 mas/yr |
| Parallax (π) | 4.72 ± 1.10mas |
| Distance | approx. 700 ly (approx. 210 pc) |
| Absolute magnitude (MV) | −1 |
| Details | |
| Mass | 6 M☉ |
| Luminosity | 1,300 L☉ |
| Rotational velocity (v sin i) | 331 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) |
|
|---|---|
| Constellation | Monoceros |
| Right ascension | 06h 28m 50.3s |
| Declination | −07° 01′ 41″ |
| Apparent magnitude (V) | 12.2 |
| Position (relative to A) | |
| Epoch of observation | 1999 |
| Angular distance | 25.4″ |
| Position angle | 47° |
| Other designations | |
| Database references | |
| SIMBAD | data |
Beta Monocerotis (Beta Mon, β Monocerotis, β Mon) is a triple star system in the constellation of Monoceros. To the naked eye, it appears as a single star with an apparent visual magnitude of approximately 3.74, making it the brightest visible star in the constellation. A telescope shows a curved line of three pale blue stars (or pale yellow stars, depending on the scope's focus). William Herschel who discovered it in 1781 commented that it is "one of the most beautiful sights in the heavens". The star system consists of three Be stars, β Monocerotis A, β Monocerotis B, and β Monocerotis C. There is also an additional visual companion star that is probably not physically close to the other three stars.
Beta Monocerotis A (Beta Mon A, β Monocerotis A, β Mon A) is a Be shell star with a mass of approximately 7 solar masses and a luminosity of 3,200 times the Sun's.
Beta Monocerotis B (Beta Mon B / β Monocerotis B / β Mon B) is a Be star with a mass of approximately 6.2 solar masses and a luminosity of 1,600 times the Sun's.
Beta Monocerotis C (Beta Mon C / β Monocerotis C / β Mon C) is a Be star with a mass of approximately 6 solar masses and a luminosity of 1,300 times the Sun's. This star was observed to be double in speckle interferometric observations in 1988, but this has not been confirmed by later infrared observations.
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