Theta Columbae
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) |
|
|---|---|
| Constellation | Columba |
| Right ascension | 06h 07m 31.63216s |
| Declination | −37° 15′ 10.5114″ |
| Apparent magnitude (V) | 5.02 |
| Characteristics | |
| Spectral type | B8 IV |
| B−V color index | −0.11 |
| Astrometry | |
| Radial velocity (Rv) | +45.3±1.8 km/s |
| Proper motion (μ) |
RA: +0.12 mas/yr Dec.: +0.41 mas/yr |
| Parallax (π) | 4.52 ± 0.16mas |
| Distance | 720 ± 30 ly (221 ± 8 pc) |
| Absolute magnitude (MV) | −1.72 |
| Details | |
| Mass | 4.13±0.09 M☉ |
| Luminosity | 472 L☉ |
| Temperature | 9,916 K |
| Rotational velocity (v sin i) | 249 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
Theta Columbae, Latinized from θ Columbae, is a solitarystar in the southern constellation of Columba. It is faintly visible to the naked eye, having an apparent visual magnitude of 5.02. Based upon an annual parallax shift of just 4.52 mas, it lies roughly 720 light years from the Sun. At that distance, the visual magnitude of the star is reduced by an interstellar extinction factor of 0.11. It is currently moving away from the Sun with a radial velocity of 45.3 km/s. The star made its closest approach about 4.7 million years ago when it underwent perihelion passage at a distance of 10.9 ly (3.33 pc).
For ancient Arabian astronomers, this star, along with ζ CMa, λ CMa, γ Col, δ Col, κ Col, λ Col, μ Col and ξ Col, formed Al Ḳurūd (ألقرد - al-qird), the Apes. In Chinese, 孫 (Sūn), meaning Grandson, refers to an asterism consisting of θ Columbae and κ Columbae. Consequently, θ Columbae itself is known as 孫二 (Sūn èr, English: the Second Star of Grandson.).
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