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BG Indi

BG Indi Facts

BG Indi's Alternative Names

The Id of the star in the Yale Bright Star Catalogue is HR8369. HIP108478 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD208496.

BG Indi has alternative name(s) :- Kappa1 Indi, BG Ind.

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

Location of BG Indi

The location of the main sequence 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 object is compared to the celestial equator and is expressed in degrees. For BG Indi, the location is 21h 58m 30.07 and -59° 00` 44.0 .

Radial Velocity and Proper Motion of BG Indi

Proper Motion

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 27.84 ± 0.31 miliarcseconds/year towards the north and 5.65 ± 0.59 miliarcseconds/year east if we saw them in the horizon.

Radial Velocity

The Radial Velocity, that is the speed at which the star is moving away/towards the Sun is 19.00 km/s with an error of about 0.50 km/s . 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.

BG 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 13.51 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, Age) of BG Indi

BG Indi Colour and Temperature

BG Indi has a spectral type of F3V. This means the star is a blue to white main sequence star. The star has a B-V Colour Index of 0.46 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 6,456 Kelvin.

BG Indi Radius

Radius has been calculated as being 2.94 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 2,048,523.52.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 2.97. 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 -0.21 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

The stars age according to Hipparcos data files put the star at an age of about 1.80 Billion years old but could be between 1.70 and 1.90 Billion years old. In comparison, the Sun's age is about 4.6 Billion Years Old.

BG Indi Apparent and Absolute Magnitudes

BG Indi has an apparent magnitude of 6.13 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 2.02 If you used the 2007 Parallax value, you would get an absolute magnitude of 2.00. 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 BG Indi

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 15.04 which gave the calculated distance to BG Indi as 216.86 light years away from Earth or 66.49 parsecs. It would take a spaceship travelling at the speed of light, 216.86 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 14.90 which put BG Indi at a distance of 218.90 light years or 67.11 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.

Using the 2007 distance, the star is roughly 13,842,334.69 Astronomical Units from the Earth/Sun give or take a few. An Astronomical Unit is the distance between Earth and the Sun. The number of A.U. is the number of times that the star is from the Earth compared to the Sun.

The star's Galacto-Centric Distance is 7,359.00 Parsecs or 24,002.36 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 BG Indi

The star is a eclipsing binary sys Beta Lyrae (Sheliak) 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. BG Indi brightness ranges from a magnitude of 6.477 to a magnitude of 6.212 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 1.5 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.

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Additional BG Indi Facts and Figures

Visual Facts

Primary / Proper / Traditional NameBG Indi
Alternative NamesKap Ind, Kappa1 Indi, HD 208496, HIP 108478, HR 8369, BG Ind
Spectral TypeF3V
Constellation's Main StarNo
Multiple Star SystemYes
Star Type Main Sequence Dwarf Star
ColourYellow - White
GalaxyMilky Way
Age1.80 Billion Years Old
Age Range1.70 - 1.90 Billion Years Old
Absolute Magnitude 2.02 / 2.00
Visual / Apparent Magnitude6.13
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)21h 58m 30.07
Declination (Dec.)-59° 00` 44.0
Galactic Latitude-46.45 degrees
Galactic Longitude333.72 degrees
1997 Distance from Earth15.04 Parallax (milliarcseconds)
 216.86 Light Years
 66.49 Parsecs
2007 Distance from Earth14.90 Parallax (milliarcseconds)
 218.90 Light Years
 67.11 Parsecs
 13,842,334.69 Astronomical Units
Galacto-Centric Distance24,002.36 Light Years / 7,359.00 Parsecs
Proper Motion Dec.27.84 ± 0.31 milliarcseconds/year
Proper Motion RA.5.65 ± 0.59 milliarcseconds/year
B-V Index0.46
Radial Velocity19.00 ± 0.50 km/s
Iron Abundance-0.21 ± 9.99 Fe/H
Semi-Major Axis8710.00
Stellar Luminosity (Lsun)13.51
Orbital Period (Days)740.60
Argument Of Periastron273.50
Associated / Clustered StarsKappa2 Indi

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Variable Star Details

Variable Star ClassEclipsing binary sys
Variable Star TypeBeta Lyrae (Sheliak)
Mean Variability Period in Days1.464
Variable Magnitude Range (Brighter - Dimmer)6.212 - 6.477

Estimated Calculated Facts

Radius (x the Sun)2.97
Effective Temperature6,456 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

Comments and Questions

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