Universe Guide

BL Indi

BL Indi Facts

  • BL Indi is a eruptive giant star that can be located in the constellation of Indus. The description is based on the spectral class.
  • BL Indi is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (M3III) of the star, the star's colour is red .
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 953.69 light years away from us. Distance

BL Indi's Alternative Names

HIP101366 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD195210.

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

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

Location of BL Indi

The location of the giant 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 BL Indi, the location is 20h 32m 41.97 and -57° 29` 06.7 .

Proper Motion of BL 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 -11.50 ± 0.79 milliarcseconds/year towards the north and 0.66 ± 1.22 milliarcseconds/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 of BL Indi

BL Indi Temperature and Colour

Based on the star's spectral type of M3III , BL Indi's colour and type is red giant star. The star has a B-V Colour Index of 1.46 which means the star's temperature is about 4,059 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

BL Indi Radius

BL Indi estimated radius has been calculated as being 12.14 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 8,443,845.98.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 9.205555227152936338925498230. The figure is derived at by using the formula from SDSS rather than peer reviewed papers. It has been known to produce widely incorrect figures.

BL Indi Apparent and Absolute Magnitudes

BL Indi has an apparent magnitude of 8.89 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 1.56. 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 BL Indi

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 2.59000 which gave the calculated distance to BL Indi as 1259.32 light years away from Earth or 386.10 parsecs. If you want that in miles, it is about 7,403,070,504,957,583.75, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 3.42000 which put BL Indi at a distance of 953.69 light years or 292.40 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 60,311,409.09 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.

Travel Time to BL Indi

The time it will take to travel to this star is dependent on how fast you are going. U.G. has done some calculations as to how long it will take going at differing speeds. A note about the calculations, when I'm talking about years, I'm talking non-leap years only (365 days).

The New Horizons space probe is the fastest probe that we've sent into space at the time of writing. Its primary mission was to visit Pluto which at the time of launch (2006), Pluto was still a planet.

DescriptionSpeed (m.p.h.)Time (years)
Airbus A380736868,967,897.98
Speed of Sound (Mach 1)767.269833,554,298.31
Concorde (Mach 2)1,534.54416,776,605.96
New Horizons Probe33,00019,380,617.36
Speed of Light670,616,629.00953.69

Variable Type of BL Indi

The star is a eruptive 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. BL Indi brightness ranges from a magnitude of 9.025 to a magnitude of 8.762 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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Additional BL Indi Facts and Figures

Visual Facts

Primary / Proper / Traditional NameBL Indi
Alternative NamesHD 195210, HIP 101366, BL Ind
Spectral TypeM3III
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeGiant Star
GalaxyMilky Way
Absolute Magnitude 0.96 / 1.56
Visual / Apparent Magnitude8.89
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)20h 32m 41.97
Declination (Dec.)-57° 29` 06.7
Galactic Latitude-36.09082780 degrees
Galactic Longitude339.89475119 degrees
1997 Distance from Earth2.59000 Parallax (milliarcseconds)
 1259.32 Light Years
 386.10 Parsecs
2007 Distance from Earth3.42000 Parallax (milliarcseconds)
 953.69 Light Years
 292.40 Parsecs
 60,311,409.09 Astronomical Units
Proper Motion Dec.-11.50000 ± 0.79000 milliarcseconds/year
Proper Motion RA.0.66000 ± 1.22000 milliarcseconds/year
B-V Index1.46

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Variable Star Details

Variable Star ClassEruptive
Variable Star TypeIrregular
Mean Variability Period in Days0.248
Variable Magnitude Range (Brighter - Dimmer)8.762 - 9.025

Estimated Calculated Facts

Radius (x the Sun)9.21
Effective Temperature4,059 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

Comments and Questions

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