Gamma Columbae
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) |
|
|---|---|
| Constellation | Columba |
| Right ascension | 05h 57m 32.20958s |
| Declination | −35° 16′ 59.8153″ |
| Apparent magnitude (V) | 4.366 + 12.664 |
| Characteristics | |
| Spectral type | B2.5 IV + G8 V |
| U−B color index | −0.66 |
| B−V color index | −0.18 |
| Variable type | Candidate SPB |
| Astrometry | |
| Radial velocity (Rv) | +24.2 km/s |
| Proper motion (μ) |
RA: −3.24 mas/yr Dec.: +10.21 mas/yr |
| Parallax (π) | 3.75 ± 0.18mas |
| Distance | 870 ± 40 ly (270 ± 10 pc) |
| Details | |
| γ Col A | |
| Mass | 5.7±0.3 M☉ |
| Radius | 4.8±0.4 R☉ |
| Luminosity | 2,070 L☉ |
| Surface gravity (log g) | 3.72±0.20 cgs |
| Temperature | 12,904 K |
| Rotational velocity (v sin i) | 96±16 km/s |
| Age | 23.6±2.0 Myr |
| γ Col B | |
| Mass | 0.94 M☉ |
| Temperature | 5,367 K |
| Other designations | |
| Database references | |
| SIMBAD | data |
Gamma Columbae is a possible wide binary star system in the southern constellation of Columba. It is visible to the naked eye with an apparent visual magnitude of 4.36. Based upon an annual parallax shift of 3.75 mas, it is located roughly 870 light years from the Sun. For early Arabian astronomers, this star, along with ζ CMa, λ CMa, δ Col, θ Col, κ Col, λ Col, μ Col and ξ Col, formed Al Ḳurūd (ألقرد - al-qird), the Apes.
The primary component is an evolvedB-type subgiant star with a stellar classification of B2.5 IV. It is a candidate slowly pulsating B-type star with a mean longitudinal magnetic field strength of 94±28 G. The star has nearly six times the mass of the Sun and close to five times the Sun's girth. It is radiating over 2,000 times the solar luminosity from its outer atmosphere at an effective temperature of 12,904 K. The estimated age of this star is around 24 million years.
...
Wikipedia