Pi2 Columbae
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Columba |
| Right ascension | 06h 07m 52.86009s |
| Declination | −42° 09′ 14.5488″ |
| Apparent magnitude (V) | 5.50 |
| Characteristics | |
| Spectral type | A0 V + A |
| B−V color index | +0.00 |
| Astrometry | |
| Radial velocity (Rv) | +31.0±3.7 km/s |
| Proper motion (μ) | RA: −10.612 mas/yr Dec.: −16.928 mas/yr |
| Parallax (π) | 12.8296±0.1132 mas |
| Distance | 254 ± 2 ly (77.9 ± 0.7 pc) |
| Absolute magnitude (MV) | +1.17 |
| Details | |
| Mass | 2.64 M☉ |
| Luminosity | 31 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 | |
| π2 Col, CD−42°2351, HD 42303, HIP 29064, HR 2181, SAO 217730 | |
| Database references | |
| SIMBAD | data |
π2 Columbae, Latinized as Pi2 Columbae, is a binary star 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. Based upon an annual parallax shift of 12.8 mas as seen from Earth, this system is located about 254 light years from the Sun. They are receding with a heliocentric radial velocity of +31 km/s.
The pair have an angular separation of 0.1 arc seconds with the primary being an A-type main-sequence star of spectral class A0 V, while the secondary component is a similar A-type star. 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. It is radiating 31 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.