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16 Scorpii, HD145607, HIP79387, HR6033

16 Scorpii is a blue main sequence dwarf star that can be located in the constellation of Scorpius. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

16 Scorpii's Alternative Names

The Id of the star in the Yale Bright Star Catalogue is HR6033. HIP79387 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD145607.

Flamsteed designations are named after the creator, Sir John Flamsteed. Sir John numbered the stars in the constellation with a number and the latin name, this star's Flamsteed designation is 16 Scorpii with it shortened to 16 Sco.

BD number is the number that the star was filed under in the Durchmusterung or Bonner Durchmusterung, a star catalogue that was put together by the Bonn Observatory between 1859 to 1903. The star's BD Number is BD-08 4180.

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

Location of 16 Scorpii

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 16 Scorpii, the location is 16h 12m 07.29 and -08° 32` 51.3 .

Proper Motion of 16 Scorpii

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 0.50 ± 0.34 miliarcseconds/year towards the north and 45.06 ± 0.57 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 5.00000 km/s with an error of about 4.20 km/s .

16 Scorpii 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 34.0000000 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

Physical Properties (Colour, Temperature) of 16 Scorpii

16 Scorpii has a spectral type of A4V. This means the star is a blue main sequence dwarf star. The star is 7333.00000000 Parsecs from the Galactic Centre or terms of Light Years is 23917.5580155200000000s. The star has a B-V Colour Index of 0.11 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 8,375 Kelvin.

16 Scorpii Radius has been calculated as being 2.79 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,938,243.26.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 2.81. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

16 Scorpii Apparent and Absolute Magnitudes

16 Scorpii has an apparent magnitude of 5.43 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 1.01 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.99. 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 16 Scorpii

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 13.05 which gave the calculated distance to 16 Scorpii as 249.93 light years away from Earth or 76.63 parsecs. It would take a spaceship travelling at the speed of light, 249.93 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 12.92 which put 16 Scorpii at a distance of 252.45 light years or 77.40 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 7,333.00 Parsecs or 23,917.56 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.

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16 Scorpii Facts

Visual Facts

Alternative NamesHD 145607, HIP 79387, HR 6033, 16 Sco, BD-08 4180
Star Type main sequence Dwarf Star
GalaxyMilky Way
Absolute Magnitude1.01 / 0.99
Visual / Apparent Magnitude5.43
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)16h 12m 07.29
Declination (Dec.)-08° 32` 51.3
Galactic Latitude29.73 degrees
Galactic Longitude3.92 degrees
1997 Distance from Earth13.05 Parallax (milliarcseconds)
 249.93 Light Years
 76.63 Parsecs
2007 Revised Distance from Earth12.92 Parallax (milliarcseconds)
 252.45 Light Years
 77.40 Parsecs
Galacto-Centric Distance23,917.56 Light Years / 7,333.00 Parsecs
Proper Motion Dec.0.50 ± 0.34 milliarcseconds/year
Proper Motion RA.45.06 ± 0.57 milliarcseconds/year
B-V Index0.11
Radial Velocity5.00 ± 4.20 km/s
Semi-Major Axis9503.00
Stellar Luminosity (Lsun)34.00
Spectral TypeA4V
Colour(A) blue

Estimated Facts

Calculated Effective Temperature8,375 Kelvin

Sources and Links

SIMBAD SourceLink

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