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V Indi, HD201484, HIP104613

V Indi is a blue to white pulsating main sequence dwarf star that can be located in the constellation of Indus. V Indi is the brightest star in Indus based on the Hipparcos 2007 apparent magnitude. The star can not be seen by the naked eye, you need a telescope to see it.

HIP104613 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD201484.

V Indi has alternative name(s), V Ind.

Location of V Indi

The location of the star in the galaxy 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 V Indi, the location is 21h 11m 29.96 and -45d04`27.7 .

Proper Motion of V Indi

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 -83.70 ± 0.90 miliarcseconds/year towards the north and -70.39 ± 1.47 miliarcseconds/year east if we saw them in the horizon.

V Indi 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 5.0000000 that I have given is based on the Spectral Types page that I have found on the Internet. You might find a different figure, one that may have been calculated rather than generalised that I have done. The figure is always the amount times the luminosity of the Sun. It is an imprecise figure because of a number of factors including but not limited to whether the star is a variable star and distance.

Physical Properties (Colour, Temperature, Radius) of V Indi

V Indi has a spectral type of F0V. This means the star is a blue to white main sequence dwarf star. The star has a B-V Colour Index of 0.28 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 7,322 Kelvin.

V Indi Radius has been calculated as being 3.55 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 2,466,708.76.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 3.39. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures. The star's Iron Abundance is -1.46 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

V Indi Apparent and Absolute Magnitudes

V Indi has an apparent magnitude of 10.19 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 1.07 If you used the 2007 Parallax value, you would get an absolute magnitude of 1.17. 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 V Indi

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 1.50 which gave the calculated distance to V Indi as 2174.42 light years away from Earth or 666.67 parsecs. It would take a spaceship travelling at the speed of light, 2174.42 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 1.57 which put V Indi at a distance of 2077.47 light years or 636.94 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.

Variable Type of V Indi

The star is a pulsating RR Lyrae type with asymmetric light curves 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. V Indi brightness ranges from a magnitude of 10.483 to a magnitude of 9.316 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.5 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.

V Indi Facts

Alternative Names

Traditional/Proper NameV Indi
Short NameV Ind
Hipparcos Library I.D.104613
Henry Draper Designation201484

Visual Facts

Star Typemain sequence dwarf star
Absolute Magnitude1.07 / 1.17
Visual / Apparent Magnitude10.19
Naked Eye VisibleRequires a 4.5 - 6 Inch Telescope - Magnitudes
Right Ascension (R.A.)21h 11m 29.96
Declination (Dec.)-45d04`27.7
Galactic Latitude-43.12 degrees
Galactic Longitude355.33 degrees
1997 Distance from Earth1.50 Parallax (milliarcseconds)
 2174.42 Light Years
 666.67 Parsecs
2007 Revised Distance from Earth1.57 Parallax (milliarcseconds)
 2077.47 Light Years
 636.94 Parsecs
Proper Motion Dec.-83.70 ± 0.90 milliarcseconds/year
Proper Motion RA.-70.39 ± 1.47 milliarcseconds/year
B-V Index0.28
Radial Velocity202.00 ± 2.00 km/s
Iron Abundance-1.46 ± 9.99 Fe/H
Spectral TypeF0V
Colour(F) blue to white

Variable Star Details

Variable Star ClassPulsating
Variable Star TypeRR Lyrae type with asymmetric light curves
Mean Variability Period in Days0.480
Variable Magnitude Range (Brighter - Dimmer)9.316 - 10.483

Estimated Facts

Luminosity (x the Sun)5.0000000
Calculated Effective Temperature7,322 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars


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