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AK Indi, HD201110, HIP104424

AK Indi is a red pulsating giant star that can be located in the constellation of Indus. 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.

AK Indi's Alternative Names

HIP104424 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD201110.

AK Indi has alternative name(s) :- , AK Ind.

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

Location of AK Indi

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 AK Indi, the location is 21h 09m 12.22 and -46° 46` 04.5 .

Proper Motion of AK 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 -0.55 ± 0.59 miliarcseconds/year towards the north and 2.49 ± 0.87 miliarcseconds/year east if we saw them in the horizon. . When the value is negative then the star and the Sun are getting closer to one another, likewise, a positive number means that two stars are moving away. Its nothing to fear as the stars are so far apart, they won't collide in our life-time, if ever.

Physical Properties (Colour, Temperature) of AK Indi

AK Indi has a spectral type of M4/M5III. This means the star is a red giant star. The star has a B-V Colour Index of 1.53 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 3,933 Kelvin.

AK Indi Radius has been calculated as being 25.91 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 18,027,908.16.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 47.59. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

AK Indi Apparent and Absolute Magnitudes

AK Indi has an apparent magnitude of 8.07 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 -0.55 If you used the 2007 Parallax value, you would get an absolute magnitude of -1.87. 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 AK Indi

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 1.89 which gave the calculated distance to AK Indi as 1725.73 light years away from Earth or 529.10 parsecs. It would take a spaceship travelling at the speed of light, 1725.73 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 1.03 which put AK Indi at a distance of 3166.63 light years or 970.87 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 AK Indi

The star is a pulsating Slow Irregular 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. AK Indi brightness ranges from a magnitude of 8.168 to a magnitude of 7.954 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.2 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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AK Indi Facts

Visual Facts


Primary / Proper / Traditional NameAK Indi
Alternative NamesHD 201110, HIP 104424, AK Ind
Spectral TypeM4/M5III
Multiple Star SystemNo / Unknown
Star TypeGiant Star
Colour red
GalaxyMilky Way
ConstellationIndus
Absolute Magnitude-0.55 / -1.87
Visual / Apparent Magnitude8.07
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)21h 09m 12.22
Declination (Dec.)-46° 46` 04.5
Galactic Latitude-42.61 degrees
Galactic Longitude353.06 degrees
1997 Distance from Earth1.89 Parallax (milliarcseconds)
 1725.73 Light Years
 529.10 Parsecs
2007 Distance from Earth1.03 Parallax (milliarcseconds)
 3166.63 Light Years
 970.87 Parsecs
Proper Motion Dec.-0.55 ± 0.59 milliarcseconds/year
Proper Motion RA.2.49 ± 0.87 milliarcseconds/year
B-V Index1.53

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeSlow Irregular
Mean Variability Period in Days0.151
Variable Magnitude Range (Brighter - Dimmer)7.954 - 8.168

Estimated Facts


Calculated Effective Temperature3,933 Kelvin

Sources and Links


SIMBAD SourceLink

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