Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation
Columba
Right ascension
05h 31m 12.74899s[1]
Declination
−35° 28′ 13.8605″[1]
Apparent magnitude (V)
3.87[2]
Characteristics
Spectral type
K1 II/III[3] or K1 IIIa[4]
U−B color index
+1.08[2]
B−V color index
+1.14[2]
Astrometry
Radial velocity (Rv)
−4.9[5] km/s
Proper motion (μ)
RA: +26.421[1] mas/yr Dec.: −30.085[1] mas/yr
Parallax (π)
12.4610 ± 0.2423 mas[1]
Distance
262 ± 5 ly (80 ± 2 pc)
Absolute magnitude (MV)
−0.67[6]
Details
Mass
2.47[7]M☉
Radius
25.2+3.1 −2.0[1]R☉
Luminosity
251.2±5.6[1]L☉
Surface gravity (log g)
2.05[4] cgs
Temperature
4,575+195 −260[1] K
Metallicity [Fe/H]
−0.03[4] dex
Age
1.53[7] Gyr
Other designations
ε Col, CD−35° 2348, FK5 2413, HD 36597, HIP 25859, HR 1862, SAO 195924[8]
Database references
SIMBAD
data
Epsilon Columbae, Latinized from ε Columbae, is a star in the southern constellation of Columba. It is visible to the naked eye, having an apparent visual magnitude of 3.87.[2] Based upon an annual parallax shift of 12.46 mas,[1] it is located approximately 262 light years distant from the Sun. The star is drifting closer with a radial velocity of −5 km/s.[5]
This is an orange-hued[9] K-type giant star with a stellar classification of K1 II/III.[3] At the age of 1.5[7] billion years old, it has exhausted the supply of hydrogen at its core then cooled and expanded off the main sequence. Epsilon Columbae has 2.5[7] times the mass and 25[1] times the radius of the Sun. The star radiates 251 times the solar luminosity from its enlarged photosphere at an effective temperature of 4,575 K.[1] It has a peculiar velocity of 30.0±3.9 km/s, making it a candidate runaway star system.[10] Based upon changes in the star's movement, it has an orbiting stellar companion of unknown type.[11]
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EpsilonColumbae, Latinized from ε Columbae, is a star in the southern constellation of Columba. It is visible to the naked eye, having an apparent visual...
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traditional star names, there were some coined in modern times, e.g. "Avior" for Epsilon Carinae (1930), and a number of stars named after people (mostly in the...
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stars, with 3 Canis Majoris being placed by Lacaille into Columba as Delta Columbae (Flamsteed had not recognised Columba as a distinct constellation). He...
expanded to include 26 potential members. Possible members include Beta Columbae, Pi Mensae, 14 Tauri and 68 Virginis. The space velocities of this group...
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Astrometric data from the Hipparcos mission reveal that the red giant star Beta Columbae passed within 2 light years of Beta Pictoris about 110,000 years ago, but...