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Rho Tucanae

Rho Tucanae Facts

  • Rho Tucanae is a main sequence star that can be located in the constellation of Tucana. The description is based on the spectral class.
  • Rho Tucanae is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (F6V) of the star, the star's colour is yellow to white .
  • The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.
  • The star has an estimated age of 1.90 Billion of Years but could be as young as 1.80 to 2.00 according to Hipparcos.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 133.84 light years away from us. Distance

Rho Tucanae's Alternative Names

Rho Tucanae (Rho Tuc) is the Bayer Classification for the star. The Bayer Classification was created by Johann Bayer in 1603. The brightest star in the constellation is normally given the Alpha designation, there are exceptions such as Pollux which is Beta Geminorum.

The Id of the star in the Yale Bright Star Catalogue is HR187. HIP3330 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD4089.

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

Location of Rho Tucanae

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 Rho Tucanae, the location is 00h 42m 28.30 and -65° 28` 05.3 .

Radial Velocity and Proper Motion of Rho Tucanae

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 40.94 ± 0.22 milliarcseconds/year towards the north and 53.07 ± 0.27 milliarcseconds/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 41.50000 km/s with an error of about 0.60 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.

Physical Properties of Rho Tucanae

Rho Tucanae Temperature and Colour

Based on the star's spectral type of F6V , Rho Tucanae's colour and type is yellow to white main sequence star. The star has a B-V Colour Index of 0.5 which means the star's temperature is about 6,285 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

Rho Tucanae 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 10.29 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

Rho Tucanae Radius

Rho Tucanae estimated radius has been calculated as being 2.69 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,873,934.43.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 2.7181296205284651097192462277. 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.

Rho Tucanae Iron Abundance

Rho Tucanae Iron Abundance is 0.08 with an error value of 0.08 Fe/H with the Sun has a value of 1 to put it into context. The value comes from the Hipparcos Extended Catalog.

Rho Tucanae Estimated Age

The stars age according to Hipparcos data files put the star at an age of about 1.90 Billion years old but could be between 1.80 and 2.00 Billion years old. In comparison, the Sun's age is about 4.6 Billion Years Old.

Rho Tucanae Apparent and Absolute Magnitudes

Rho Tucanae has an apparent magnitude of 5.38 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 2.33 If you used the 2007 Parallax value, you would get an absolute magnitude of 2.31. 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 Rho Tucanae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 24.59000 which gave the calculated distance to Rho Tucanae as 132.64 light years away from Earth or 40.67 parsecs. If you want that in miles, it is about 779,740,869,499,074.03, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 24.37000 which put Rho Tucanae at a distance of 133.84 light years or 41.03 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 8,462,986.03 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 7,386.00 Parsecs or 24,090.42 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Travel Time to Rho Tucanae

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)
Walking422,438,832,406.34
Car120747,961,080.21
Airbus A380736121,950,176.12
Speed of Sound (Mach 1)767.269116,980,263.28
Concorde (Mach 2)1,534.5458,490,055.41
New Horizons Probe33,0002,719,858.47
Speed of Light670,616,629.00133.84

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 Rho Tucanae Facts and Figures

Visual Facts


Primary / Proper / Traditional NameRho Tucanae
Alternative NamesRho Tuc, HD 4089, HIP 3330, HR 187
Spectral TypeF6V
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star Type Main Sequence Dwarf Star
ColourYellow - White
GalaxyMilky Way
ConstellationTucana
Age1.90 Billion Years Old
Age Range1.80 - 2.00 Billion Years Old
Absolute Magnitude 2.33 / 2.31
Visual / Apparent Magnitude5.38
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)00h 42m 28.30
Declination (Dec.)-65° 28` 05.3
Galactic Latitude-51.63401064 degrees
Galactic Longitude304.43118805 degrees
1997 Distance from Earth24.59000 Parallax (milliarcseconds)
 132.64 Light Years
 40.67 Parsecs
2007 Distance from Earth24.37000 Parallax (milliarcseconds)
 133.84 Light Years
 41.03 Parsecs
 8,462,986.03 Astronomical Units
Galacto-Centric Distance24,090.42 Light Years / 7,386.00 Parsecs
Proper Motion Dec.40.94000 ± 0.22000 milliarcseconds/year
Proper Motion RA.53.07000 ± 0.27000 milliarcseconds/year
B-V Index0.5
Radial Velocity41.50000 ± 0.60 km/s
Iron Abundance0.0800 ± 0.08 Fe/H
Eccentricity0.09010
Semi-Major Axis7095.0000000
Stellar Luminosity (Lsun)10.2900000

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Calculated Facts


Radius (x the Sun)2.72
Effective Temperature6,285 Kelvin

Sources and Links


SIMBAD SourceLink

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