| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Pictor |
| Right ascension | 04h 48m 57.47286s[2] |
| Declination | −47° 08′ 04.2557″[2] |
| Apparent magnitude (V) | 7.37 - 7.53[3] |
| Characteristics | |
| TV Pictoris A | |
| Spectral type | A2V[3] |
| Variable type | Ellipsoidal[4] |
| TV Pictoris B | |
| Spectral type | A9-F0V |
| Other designations | |
| TV Pic,CD−47 1526,HD 30861HIP=22370,SAO 217011 | |
| Database references | |
| SIMBAD | data |
TV Pictoris is arotating ellipsoidal variable star in the constellationPictor. It ranges between apparent magnitude 7.37 - 7.53 over a period of 0.85 days.[3] It was first discovered to be variable in 1987.[5] The system is inclined at an angle of 54 degrees to observers on Earth. It is composed of a primary star that has a radius 4.3 times that of the sun and 1.2 times its mass, and aneffective (surface) temperature of 8300 K, and a secondary star with a radius 2.1 times that of the sun and 40% of its mass, and an effective temperature of 7000 K. Both stars are less massive than expected for amain sequence star of their temperatures. The secondary rotates much faster than the primary.[6]
The system shines with a combined spectrum of A2V. Based upon an annualparallax shift of 5.14 milliarc seconds as measured by theHipparcos satellite,[7] this system is 640light-years (195parsecs) fromEarth. Analysing and recalibrating yields a parallax of 4.70 and hence a distance of 690light-years (213parsecs).[8]
