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Omega2 Scorpii, 10 Scorpii, HD144608, HIP78990, HR5997

Omega2 Scorpii is a white to yellow giant star that can be located in the constellation of Scorpius. Omega2 Scorpii is the brightest star in Scorpius 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.

Omega2 Scorpii is the Bayer Classification for the star. The Id of the star in the Yale Bright Star Catalogue is HR5997. HIP78990 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD144608.

Location of Omega2 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 Omega2 Scorpii, the location is 16h 07m 24.30 and -20d 52` 07.2 .

Proper Motion of Omega2 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 -45.42 ± 0.18 miliarcseconds/year towards the north and 44.81 ± 0.32 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of Omega2 Scorpii

Omega2 Scorpii has a spectral type of G6/G8III. This means the star is a white to yellow giant star. The star is 7319.00000000 Parsecs from the Galactic Centre or terms of Light Years is 23871.8951473600000000s. The star has a B-V Colour Index of 0.83 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 5,212 Kelvin.

Omega2 Scorpii Radius has been calculated as being 12.79 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 8,899,823.06.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 14.02. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures. The star's Iron Abundance is -0.04 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

Omega2 Scorpii Apparent and Absolute Magnitudes

Omega2 Scorpii has an apparent magnitude of 4.31 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 -0.24 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.44. 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 Omega2 Scorpii

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 12.32 which gave the calculated distance to Omega2 Scorpii as 264.74 light years away from Earth or 81.17 parsecs. It would take a spaceship travelling at the speed of light, 264.74 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 11.22 which put Omega2 Scorpii at a distance of 290.70 light years or 89.13 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 7,319.00 Parsecs or 23,871.90 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.

Omega2 Scorpii Facts

Alternative Names

Flamsteed Name10 Scorpii
Flamsteed Short Name10 Sco
Bayer DesignationOmega2 Scorpii
Hipparcos Library I.D.78990
Yale Bright Star Catalogue (HR) Id5997
Bonner DurchmusterungBD-20 4408
Henry Draper Designation144608

Visual Facts

Star Typegiant star
Absolute Magnitude-0.24 / -0.44
Visual / Apparent Magnitude4.31
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)16h 07m 24.30
Declination (Dec.)-20d 52` 07.2
Galactic Latitude22.53 degrees
Galactic Longitude352.70 degrees
1997 Distance from Earth12.32 Parallax (milliarcseconds)
 264.74 Light Years
 81.17 Parsecs
2007 Revised Distance from Earth11.22 Parallax (milliarcseconds)
 290.70 Light Years
 89.13 Parsecs
Galacto-Centric Distance23,871.90 Light Years / 7,319.00 Parsecs
Proper Motion Dec.-45.42 ± 0.18 milliarcseconds/year
Proper Motion RA.44.81 ± 0.32 milliarcseconds/year
B-V Index0.83
Radial Velocity-4.80 ± 0.30 km/s
Iron Abundance-0.04 ± 9.99 Fe/H
Spectral TypeG6/G8III
Associated / Clustered StarsOmega1 Scorpii
Colour(G) White to Yellow

Estimated Facts

Calculated Effective Temperature5,212 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

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