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Beta Horologii, HD18866, HIP13884, HR909

Beta Horologii is a blue giant star that can be located in the constellation of Horologium. Beta Horologii is the brightest star in Horologium based on the Hipparcos 2007 apparent magnitude. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

Beta Horologii is the Bayer Classification for the star. The Id of the star in the Yale Bright Star Catalogue is HR909. HIP13884 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD18866.

Location of Beta Horologii

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 Beta Horologii, the location is 02h 58m 47.77 and -64d 04` 16.7 .

Proper Motion of Beta Horologii

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 5.18 ± 0.19 miliarcseconds/year towards the north and 22.76 ± 0.19 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of Beta Horologii

Beta Horologii has a spectral type of A5III. This means the star is a blue giant star. The star is 7387.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24093.6862212800000000s. The star has a B-V Colour Index of 0.12 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 8,298 Kelvin.

Beta Horologii Radius has been calculated as being 4.37 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 3,043,969.40.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 4.12. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

Beta Horologii Apparent and Absolute Magnitudes

Beta Horologii has an apparent magnitude of 4.98 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 0.07 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.20. 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 Beta Horologii

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 10.40 which gave the calculated distance to Beta Horologii as 313.62 light years away from Earth or 96.15 parsecs. It would take a spaceship travelling at the speed of light, 313.62 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 11.07 which put Beta Horologii at a distance of 294.64 light years or 90.33 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 7,387.00 Parsecs or 24,093.69 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.

Beta Horologii Facts

Alternative Names

Bayer DesignationBeta Horologii
Hipparcos Library I.D.13884
Yale Bright Star Catalogue (HR) Id909
Henry Draper Designation18866

Visual Facts

Star Typegiant star
Absolute Magnitude0.07 / 0.20
Visual / Apparent Magnitude4.98
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)02h 58m 47.77
Declination (Dec.)-64d 04` 16.7
Galactic Latitude-47.79 degrees
Galactic Longitude282.85 degrees
1997 Distance from Earth10.40 Parallax (milliarcseconds)
 313.62 Light Years
 96.15 Parsecs
2007 Revised Distance from Earth11.07 Parallax (milliarcseconds)
 294.64 Light Years
 90.33 Parsecs
Galacto-Centric Distance24,093.69 Light Years / 7,387.00 Parsecs
Proper Motion Dec.5.18 ± 0.19 milliarcseconds/year
Proper Motion RA.22.76 ± 0.19 milliarcseconds/year
B-V Index0.12
Radial Velocity23.60 ± 2.80 km/s
Spectral TypeA5III
Colour(A) blue

Estimated Facts

Calculated Effective Temperature8,298 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

Location of Beta Horologii in Horologium

Beta Horologii (Beta Horologii) Location in Horologium

The map was generated using Night Vision, an awesome free application by Brian Simpson.

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