Beta Canis Minoris
 Position of Beta Canis Minoris. | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Canis Minor |
| Right ascension | 07h 27m 09.0s |
| Declination | +08° 17′ 22″ |
| Apparent magnitude (V) | 2.89 (2.84–2.92) |
| Characteristics | |
| Spectral type | B8Ve |
| U−B color index | -0.28 |
| B−V color index | -0.09 |
| Variable type | γ Cas |
| Astrometry | |
| Radial velocity (Rv) | +22 km/s |
| Proper motion (μ) | RA: -50.28 mas/yr Dec.: -38.45 mas/yr |
| Parallax (π) | 19.16 ± 0.85 mas |
| Distance | 170 ly (52.2 pc) |
| Absolute magnitude (MV) | -0.70 |
| Details | |
| Mass | 3 M☉ |
| Radius | 4 R☉ |
| Luminosity | 250 L☉ |
| Temperature | 11,500 K |
| Metallicity | ? |
| Rotation | 250 km/s |
| Age | ? years |
| Other designations | |
Beta Canis Minoris (β CMi / β Canis Minoris) is a star in the constellation of Canis Minor. It also has the traditional name Gomeisa.
Beta Canis Minoris is a hot, B8-class main sequence star of apparent magnitude 2.9, easily visible to the naked eye. It is slightly variable, and belongs to the Gamma Cassiopeiae category of variable stars. This star is rotating rapidly and is surrounded by a disk of material, which the emissions are heating up.
The traditional name is supposed to be from an Arabic word al-ghumaisa’ "the bleary-eyed one", cognate with the modern Arabic name for Procyon, غموص ghumūş.
References
- SIMBAD Query Result
- Alcyone emphemeris entry
- Gomeisa by Professor Jim Kaler.
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