TV Pictoris
Star in the constellation Pictor
From Wikipedia, the free encyclopedia
TV Pictoris is a rotating ellipsoidal variable star in the constellation Pictor. 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 an effective (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 a main sequence star of their temperatures. The secondary rotates much faster than the primary.[6]
| 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 30861, HIP 22370, SAO 217011 | |
| Database references | |
| SIMBAD | data |
The system shines with a combined spectrum of A2V. Based upon an annual parallax shift of 5.14 milliarc seconds as measured by the Hipparcos satellite,[7] this system is 640 light-years (195 parsecs) from Earth. Analysing and recalibrating yields a parallax of 4.70 and hence a distance of 690 light-years (213 parsecs).[8]