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]

TV Pictoris

A light curve for TV Pictoris, plotted from TESS data[1]
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

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]

References