Global InformationTheta Columbae information
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Columba |
| Right ascension | 06h 07m 31.63216s[1] |
| Declination | −37° 15′ 10.5114″[1] |
| Apparent magnitude (V) | 5.02[2] |
| Characteristics | |
| Spectral type | B8 IV[3] |
| B−V color index | −0.11[2] |
| Astrometry | |
| Radial velocity (Rv) | +45.3±1.8[4] km/s |
| Proper motion (μ) | RA: +0.12[1] mas/yr Dec.: +0.41[1] mas/yr |
| Parallax (π) | 4.52 ± 0.16 mas[1] |
| Distance | 720 ± 30 ly (221 ± 8 pc) |
| Absolute magnitude (MV) | −1.72[5] |
| Details | |
| Mass | 4.13±0.09[6] M☉ |
| Luminosity | 472[7] L☉ |
| Temperature | 9,916[7] K |
| Rotational velocity (v sin i) | 249[3] km/s |
| Age | 237[8] Myr |
| Other designations | |
Elkurud, θ Col, CD−37°2609, FK5 2468, HD 42167, HIP 29034, HR 2177, SAO 196514[9] | |
| Database references | |
| SIMBAD | data |
Theta Columbae, also named Elkurud /ˈɛlkərʌd/,[10] is a solitary[11] star in the southern constellation of Columba. It is faintly visible to the naked eye, having an apparent visual magnitude of 5.02.[2] Based upon parallax measurements taken during the Hipparcos mission, it is roughly 720 light-years (220 parsecs) distant from the Sun.[1] At its present distance, the visual magnitude of the star is reduced by an interstellar extinction factor of 0.11.[8] It is currently moving away from the Sun with a radial velocity of 45.3 km/s.[4] 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).[4]
This is an evolving B-type subgiant star with a stellar classification of B8 IV,[3] having recently left the main sequence.[6] It is spinning rapidly with a projected rotational velocity of 249 km/s.[3] The star has an estimated four times the mass of the Sun.[6] It radiates 472 times the solar luminosity from its outer atmosphere at an effective temperature of 9,916 K.[7]
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