Sigma Columbae
Star in the constellation Columba
From Wikipedia, the free encyclopedia
Sigma Columbae is a solitary,[10] yellow-white hued star in the southern constellation of Columba. Its name is a Bayer designation that is Latinized from σ Columbae, and abbreviated Sigma Col or σ Col. This star is faintly visible to the naked eye with an apparent visual magnitude of 5.51.[3] Based upon an annual parallax shift of 2.3 mas as seen from Earth,[2] this star is located at a distance of approximately 1,420 light years from the Sun.
 | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Columba[1] |
| Right ascension | 05h 56m 20.943s[2] |
| Declination | −31° 22′ 56.780″[2] |
| Apparent magnitude (V) | 5.51[3] |
| Characteristics | |
| Spectral type | F2 III[4] |
| B−V color index | +0.39[3] |
| Astrometry | |
| Radial velocity (Rv) | +19.4±2.9[5] km/s |
| Proper motion (μ) | RA: +0.692 mas/yr[2] Dec.: +6.510 mas/yr[2] |
| Parallax (π) | 2.2952±0.0438 mas[2] |
| Distance | 1,420 ± 30 ly (436 ± 8 pc) |
| Absolute magnitude (MV) | −2.98[1] |
| Details | |
| Mass | 3.79[6] M☉ |
| Luminosity | 1,312[7] L☉ |
| Surface gravity (log g) | 2.02[6] cgs |
| Temperature | 6,820[8] K |
| Metallicity [Fe/H] | −0.91[6] dex |
| Rotational velocity (v sin i) | 73.4±3.7[8] km/s |
| Age | 400[6] Myr |
| Other designations | |
| σ Col, CD−31°2848, FK5 2454, GC 7499, HD 40248, HIP 28098, HR 2092, SAO 196330[9] | |
| Database references | |
| SIMBAD | data |
At an age of about 400 million years,[6] the spectrum of this star suggests this is an evolved F-type giant with a stellar classification of F2 III.[4] It is spinning with a projected rotational velocity of about 74 km/s,[8] which is giving the star an oblate shape with an equatorial bulge that is 10% larger than the polar radius.[11] It has 3.79[6] times the mass of the Sun and is radiating 1,312[7] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 6,820 K.[8]