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DL Tucanae

DL Tucanae Facts

DL Tucanae's Alternative Names

HIP112830 is the reference name for the star in the Hipparcos Star Catalogue.

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

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

Location of DL Tucanae

The location of the variable 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 DL Tucanae, the location is 22h 51m 01.46 and -59° 36` 50.3 .

Proper Motion of DL 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 -45.81 ± 1.85 milliarcseconds/year towards the north and 127.72 ± 3.03 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 (Colour, Temperature) of DL Tucanae

DL Tucanae Colour and Temperature

DL Tucanae has a spectral type of K7. This means the star is a orange to red variable star. The star has a B-V Colour Index of 1.23 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,512 Kelvin.

DL Tucanae Radius

Radius has been calculated as being 0.61 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 421,289.69.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 0.91. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

DL Tucanae Apparent and Absolute Magnitudes

DL Tucanae has an apparent magnitude of 11.77 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 7.01 If you used the 2007 Parallax value, you would get an absolute magnitude of 6.13. 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 DL Tucanae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 11.17 which gave the calculated distance to DL Tucanae as 292.00 light years away from Earth or 89.53 parsecs. It would take a spaceship travelling at the speed of light, 292.00 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 7.45 which put DL Tucanae at a distance of 437.80 light years or 134.23 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 27,686,732.02 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. DL Tucanae brightness ranges from a magnitude of 12.019 to a magnitude of 11.740 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.1 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 DL Tucanae Facts and Figures

Visual Facts

Primary / Proper / Traditional NameDL Tucanae
Alternative NamesHIP 112830, DL Tuc
Spectral TypeK7
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
ColourOrange to Red
GalaxyMilky Way
Absolute Magnitude 7.01 / 6.13
Visual / Apparent Magnitude11.77
Naked Eye VisibleRequires a 4.5 - 6 Inch Telescope - Magnitudes
Right Ascension (R.A.)22h 51m 01.46
Declination (Dec.)-59° 36` 50.3
Galactic Latitude-51.52 degrees
Galactic Longitude326.99 degrees
1997 Distance from Earth11.17 Parallax (milliarcseconds)
 292.00 Light Years
 89.53 Parsecs
2007 Distance from Earth7.45 Parallax (milliarcseconds)
 437.80 Light Years
 134.23 Parsecs
 27,686,732.02 Astronomical Units
Proper Motion Dec.-45.81 ± 1.85 milliarcseconds/year
Proper Motion RA.127.72 ± 3.03 milliarcseconds/year
B-V Index1.23

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Variable Star Details

Mean Variability Period in Days0.138
Variable Magnitude Range (Brighter - Dimmer)11.740 - 12.019

Estimated Calculated Facts

Radius (x the Sun)0.91
Effective Temperature4,512 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

Comments and Questions

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