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Star in the constellation Columba From Wikipedia, the free encyclopedia
Eta Columbae is a solitary[8] star near the southern boundary of the constellation Columba.[9] It is visible to the naked eye, having an apparent visual magnitude of 3.96.[2] Based upon an annual parallax shift of 6.91 mas,[1] it lies at a distance of roughly 472 light years from the Sun.
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Columba |
Right ascension | 05h 59m 08.80519s[1] |
Declination | −42° 48′ 54.4822″[1] |
Apparent magnitude (V) | 3.96[2] |
Characteristics | |
Spectral type | G8/K1 II[3] or K0 III[4] |
U−B color index | +1.08[2] |
B−V color index | +1.14[2] |
Astrometry | |
Radial velocity (Rv) | +17.0[4] km/s |
Proper motion (μ) | RA: +18.39[1] mas/yr Dec.: −10.87[1] mas/yr |
Parallax (π) | 6.91 ± 0.12 mas[1] |
Distance | 472 ± 8 ly (145 ± 3 pc) |
Absolute magnitude (MV) | −2.10[5] |
Details[4] | |
Mass | 3.33 M☉ |
Radius | 38.6[6] R☉ |
Luminosity | 708 L☉ |
Surface gravity (log g) | 1.72 cgs |
Temperature | 4,620±54 K |
Metallicity [Fe/H] | −0.01 dex |
Other designations | |
Database references | |
SIMBAD | data |
This is an orange-hued[9] K-type giant star with a stellar classification of K0 III,[4] or possibly a bright giant with a crossover class of G8/K1 II.[3] The measured angular diameter of this star, after correction for limb darkening, is 2.48±0.03 mas.[10] At the estimated distance of this star, this yields a physical size of about 38.6 times the radius of the Sun.[6] It has an estimated 3.33 times the mass of the Sun and radiates 708 times the solar luminosity from its outer atmosphere at an effective temperature of 4,620 K.[4]
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