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Lambda Tucanae - HD5190 - HIP4084

Lambda Tucanae is a blue to white subgiant star that can be located in the constellation of Tucana. The star can not be seen by the naked eye, you need a telescope to see it. The star has an estimated age of 2.40 Billion of Years but could be as young as 2.20 to 2.60 according to Hipparcos.

Lambda Tucanae is the Bayer Classification for the star. HIP4084 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD5190. Lambda Tucanae is a multiple star system with 2 stars orbiting in its solar system.

Location of Lambda Tucanae

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 Lambda Tucanae, the location is 00h 52m 24.51 and -69d30`12.9 .

Proper Motion of Lambda Tucanae

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 -70.79 ± 1.17 miliarcseconds/year towards the north and 4.87 ± 1.41 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Age, Radius) of Lambda Tucanae

Lambda Tucanae has a spectral type of F7IV/V. This means the star is a blue to white subgiant star. The star is 7377.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24061.0698868800000000s. The star has a B-V Colour Index of 0.51 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 6,243 Kelvin.

Lambda Tucanae Radius has been calculated as being 2.27 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,579,699.06.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 2.34. 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 0.02 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 2.40 Billion years old but could be between 2.20 and 2.60 Billion years old. In comparison, the Sun's age is about 4.6 Billion Years Old.

The star has a companion star which is in orbit close by, it has at least the following companions in close orbit, Lambda Tucanae B.

Lambda Tucanae Apparent and Absolute Magnitudes

Lambda Tucanae has an apparent magnitude of 6.67 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 2.73 If you used the 2007 Parallax value, you would get an absolute magnitude of 2.66. 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 Lambda Tucanae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 16.33 which gave the calculated distance to Lambda Tucanae as 199.73 light years away from Earth or 61.24 parsecs. It would take a spaceship travelling at the speed of light, 199.73 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 15.80 which put Lambda Tucanae at a distance of 206.43 light years or 63.29 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 7,377.00 Parsecs or 24,061.07 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

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.

Lambda Tucanae Facts

Alternative Names

Bayer DesignationLambda Tucanae
Hipparcos Library I.D.4084
Henry Draper Designation5190

Visual Facts

Star Typesubgiant star
Age2.40 Billion Years Old
Age Range2.20 - 2.60 Billion Years Old
Absolute Magnitude2.73 / 2.66
Visual / Apparent Magnitude6.67
Naked Eye VisibleRequires a 7x50 Binoculars - Ref: Wiki
Right Ascension (R.A.)00h 52m 24.51
Declination (Dec.)-69d30`12.9
Galactic Latitude-47.62 degrees
Galactic Longitude302.81 degrees
1997 Distance from Earth16.33 Parallax (milliarcseconds)
 199.73 Light Years
 61.24 Parsecs
2007 Revised Distance from Earth15.80 Parallax (milliarcseconds)
 206.43 Light Years
 63.29 Parsecs
Galacto-Centric Distance24,061.07 Light Years / 7,377.00 Parsecs
Proper Motion Dec.-70.79 ± 1.17 milliarcseconds/year
Proper Motion RA.4.87 ± 1.41 milliarcseconds/year
B-V Index0.51
Radial Velocity29.40 ± 0.20 km/s
Iron Abundance0.02 ± 9.99 Fe/H
Spectral TypeF7IV/V
Colour(F) blue to white

Companions (Multi-Star and Exoplanets) Facts

Stars in Solar System2
Companion StarsLambda Tucanae B

Estimated Facts

Calculated Effective Temperature6,243 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars


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