Pi2 Columbae
| 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 | |
| π2 Col, CD−42°2351, HD 42303, HIP 29064, HR 2181, SAO 217730[8] | |
| 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]
References
[edit | edit source]- ^ a b c d e f Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). Gaia DR2 record for this source at VizieR.
- ^ a b c Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b c d Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
