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Nu Tucanae, HD213442, HIP111310, HR8582

Nu Tucanae is a red pulsating giant star that can be located in the constellation of Tucana. The description is based on the spectral class. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

Nu Tucanae's Alternative Names

Nu Tucanae (Nu. Tuc) is the Bayer Classification for the star. The Id of the star in the Yale Bright Star Catalogue is HR8582. HIP111310 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD213442.

Nu Tucanae has alternative name(s) :- , nu. Tuc.

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

Location of Nu Tucanae

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 Nu Tucanae, the location is 22h 33m 00.01 and -61° 58` 55.5 .

Proper Motion of Nu 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 -20.17 ± 0.14 miliarcseconds/year towards the north and 40.07 ± 0.23 miliarcseconds/year east if we saw them in the horizon. The Radial Velocity, that is the speed at which the star is moving away/towards us is -3.40000 km/s with an error of about 0.80 km/s .

Physical Properties (Colour, Temperature) of Nu Tucanae

Nu Tucanae has a spectral type of M4III. This means the star is a red giant star. The star is 7,351.00 Parsecs from the Galactic Centre or terms of Light Years is 23,976.27 s. The star has a B-V Colour Index of 1.61 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 3,754 Kelvin.

Nu Tucanae Radius has been calculated as being 19.23 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 13,378,158.85.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 20.51. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

Nu Tucanae Apparent and Absolute Magnitudes

Nu Tucanae has an apparent magnitude of 4.91 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 0.30 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.16. 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 Nu Tucanae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 11.96 which gave the calculated distance to Nu Tucanae as 272.71 light years away from Earth or 83.61 parsecs. It would take a spaceship travelling at the speed of light, 272.71 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 11.24 which put Nu Tucanae at a distance of 290.18 light years or 88.97 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 7,351.00 Parsecs or 23,976.27 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 Nu Tucanae

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. Nu Tucanae brightness ranges from a magnitude of 5.060 to a magnitude of 4.793 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.3 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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Nu Tucanae Facts

Visual Facts

Primary / Proper / Traditional NameNu Tucanae
Alternative NamesNu. Tuc, HD 213442, HIP 111310, HR 8582, nu. Tuc
Spectral TypeM4III
Multiple Star SystemNo / Unknown
Star TypeGiant Star
Colour red
GalaxyMilky Way
Absolute Magnitude0.30 / 0.16
Visual / Apparent Magnitude4.91
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)22h 33m 00.01
Declination (Dec.)-61° 58` 55.5
Galactic Latitude-48.30 degrees
Galactic Longitude326.58 degrees
1997 Distance from Earth11.96 Parallax (milliarcseconds)
 272.71 Light Years
 83.61 Parsecs
2007 Distance from Earth11.24 Parallax (milliarcseconds)
 290.18 Light Years
 88.97 Parsecs
Galacto-Centric Distance23,976.27 Light Years / 7,351.00 Parsecs
Proper Motion Dec.-20.17 ± 0.14 milliarcseconds/year
Proper Motion RA.40.07 ± 0.23 milliarcseconds/year
B-V Index1.61
Radial Velocity-3.40 ± 0.80 km/s
Semi-Major Axis7611.00

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Variable Star Details

Variable Star ClassPulsating
Variable Star TypeSlow Irregular
Mean Variability Period in Days0.251
Variable Magnitude Range (Brighter - Dimmer)4.793 - 5.060

Estimated Facts

Calculated Effective Temperature3,754 Kelvin

Sources and Links

SIMBAD SourceLink

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