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TV Pictoris, HD30861, HIP22370

TV Pictoris is a blue rotating main sequence dwarf star that can be located in the constellation of Pictor. The description is based on the spectral class. The star can not be seen by the naked eye, you need a telescope to see it.

TV Pictoris's Alternative Names

HIP22370 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD30861.

TV Pictoris has alternative name(s) :- , TV Pic.

More details on star alternative names can be found at Star Names .

Location of TV Pictoris

The location of the star in the night sky is determined by the Right Ascension (R.A.) and Declination (Dec.), these are equivalent to the Longitude and Latitude on the Earth. The Right Ascension is how far expressed in time (hh:mm:ss) the star is along the celestial equator. If the R.A. is positive then its eastwards. The Declination is how far north or south the star is compared to the celestial equator and is expressed in degrees. For TV Pictoris, the location is 04h 48m 57.44 and -47° 08` 04.6 .

Proper Motion of TV Pictoris

All stars like planets orbit round a central spot, in the case of planets, its the central star such as the Sun. In the case of a star, its the galactic centre. The constellations that we see today will be different than they were 50,000 years ago or 50,000 years from now. Proper Motion details the movements of these stars and are measured in milliarcseconds. The star is moving 34.28 ± 0.42 miliarcseconds/year towards the north and 42.34 ± 0.44 miliarcseconds/year east if we saw them in the horizon.

TV Pictoris Luminosity

Luminosity is the amount of energy that a star pumps out and its relative to the amount that our star, the Sun gives out. The figure of 32.63 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

Physical Properties (Colour, Temperature) of TV Pictoris

TV Pictoris has a spectral type of A2V. This means the star is a blue main sequence dwarf star. The star is 7,445.00 Parsecs from the Galactic Centre or terms of Light Years is 24,282.86 s. The star has a B-V Colour Index of 0.14 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 8,153 Kelvin.

TV Pictoris Radius has been calculated as being 3.01 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 2,092,876.11.km. If you need the diameter of the star, you just need to multiple the radius by 2. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 2.95. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

TV Pictoris Apparent and Absolute Magnitudes

TV Pictoris has an apparent magnitude of 7.45 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. If you used the 1997 Parallax value, you would get an absolute magnitude of 0.96 If you used the 2007 Parallax value, you would get an absolute magnitude of 1.00. Magnitude, whether it be apparent/visual or absolute magnitude is measured by a number, the smaller the number, the brighter the Star is. Our own Sun is the brightest star and therefore has the lowest of all magnitudes, -26.74. A faint star will have a high number.

Distance to TV Pictoris

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 5.04 which gave the calculated distance to TV Pictoris as 647.15 light years away from Earth or 198.41 parsecs. It would take a spaceship travelling at the speed of light, 647.15 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

In 2007, Hipparcos data was revised with a new parallax of 5.14 which put TV Pictoris at a distance of 634.56 light years or 194.55 parsecs. It should not be taken as though the star is moving closer or further away from us. It is purely that the distance was recalculated.

The star's Galacto-Centric Distance is 7,445.00 Parsecs or 24,282.86 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Variable Type of TV Pictoris

The star is a rotating Rotating ellipsoidal variable type which means that its size changes over time. The Variable Type is usually named after the first star of that type to be spotted. TV Pictoris brightness ranges from a magnitude of 7.572 to a magnitude of 7.432 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.9 days (variability).

Source of Information

The source of the information if it has a Hip I.D. is from Simbad, the Hipparcos data library based at the University at Strasbourg, France. Hipparcos was a E.S.A. satellite operation launched in 1989 for four years. The items in red are values that I've calculated so they could well be wrong. Information regarding Metallicity and/or Mass is from the E.U. Exoplanets. The information was obtained as of 12th Feb 2017.

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TV Pictoris Facts

Visual Facts


Primary / Proper / Traditional NameTV Pictoris
Alternative NamesHD 30861, HIP 22370, TV Pic
Spectral TypeA2V
Multiple Star SystemNo / Unknown
Star Type main sequence Dwarf Star
Colour blue
GalaxyMilky Way
ConstellationPictor
Absolute Magnitude0.96 / 1.00
Visual / Apparent Magnitude7.45
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)04h 48m 57.44
Declination (Dec.)-47° 08` 04.6
Galactic Latitude-39.99 degrees
Galactic Longitude253.11 degrees
1997 Distance from Earth5.04 Parallax (milliarcseconds)
 647.15 Light Years
 198.41 Parsecs
2007 Distance from Earth5.14 Parallax (milliarcseconds)
 634.56 Light Years
 194.55 Parsecs
Galacto-Centric Distance24,282.86 Light Years / 7,445.00 Parsecs
Proper Motion Dec.34.28 ± 0.42 milliarcseconds/year
Proper Motion RA.42.34 ± 0.44 milliarcseconds/year
B-V Index0.14
Stellar Luminosity (Lsun)32.63

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassRotating
Variable Star TypeRotating ellipsoidal
Mean Variability Period in Days0.852
Variable Magnitude Range (Brighter - Dimmer)7.432 - 7.572

Estimated Facts


Calculated Effective Temperature8,153 Kelvin

Sources and Links


SIMBAD SourceLink

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