Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Columba |
Right ascension | 06h 07m 52.86009s[1] |
Declination | −42° 09′ 14.5488″[1] |
Apparent magnitude (V) | 5.50[2] |
Characteristics | |
Spectral type | A0 V + A[3] |
B−V color index | +0.00[2] |
Astrometry | |
Radial velocity (Rv) | +31.0±3.7[4] km/s |
Proper motion (μ) | RA: −10.612[1] mas/yr Dec.: −16.928[1] mas/yr |
Parallax (π) | 12.8296 ± 0.1132 mas[1] |
Distance | 254 ± 2 ly (77.9 ± 0.7 pc) |
Absolute magnitude (MV) | +1.17[5] |
Details[6] | |
Mass | 2.64 M☉ |
Luminosity | 31[7] L☉ |
Surface gravity (log g) | 4.38±0.14 cgs |
Temperature | 11,223±382 K |
Rotational velocity (v sin i) | 274 km/s |
Age | 98 Myr |
Other designations | |
Database references | |
SIMBAD | data |
π2 Columbae, Latinized as Pi2 Columbae, is a binary star[9] system in the southern constellation of Columba, near the southern constellation border with Pictor. It is white-hued and dimly visible to the naked eye with a combined apparent visual magnitude of 5.50.[2] Based upon an annual parallax shift of 12.8 mas as seen from Earth,[1] this system is located about 254 light years from the Sun. They are receding with a heliocentric radial velocity of +31 km/s.[4]
The pair have an angular separation of 0.1[3] arc seconds with the primary being an A-type main-sequence star of spectral class A0 V,[3] while the secondary component is a similar A-type star.[9] The primary is 98 million years old with 2.6 times the mass of the Sun and is spinning rapidly with a projected rotational velocity of 274 km/s.[6] It is radiating 31[7] times the luminosity of the Sun from its photosphere at an effective temperature of 11,223 K. The system is a source of X-ray emission with a luminosity of 184.3×1020 W, which is considered unusual since A-type stars are not expected to display magnetic activity.[3]
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