Universe Guide


V1003 Scorpii, HD149711, HIP81472

V1003 Scorpii is a blue rotating subgiant star that can be located in the constellation of Scorpius. V1003 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.

HIP81472 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD149711.

V1003 Scorpii has alternative name(s), V1003 Sco.

Location of V1003 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 V1003 Scorpii, the location is 16h 38m 26.30 and -43d23`54.2 .

Proper Motion of V1003 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 -17.29 ± 1.11 miliarcseconds/year towards the north and -13.08 ± 0.77 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of V1003 Scorpii

V1003 Scorpii has a spectral type of B2.5IV. This means the star is a blue subgiant star. The star is 7224.00000000 Parsecs from the Galactic Centre or terms of Light Years is 23562.0399705600000000s. The star has a B-V Colour Index of -0.05 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 10,395 Kelvin.

V1003 Scorpii Radius has been calculated as being 4.14 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 2,882,349.23.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 3.78. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

V1003 Scorpii Apparent and Absolute Magnitudes

V1003 Scorpii has an apparent magnitude of 5.83 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 -0.79 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.59. 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 V1003 Scorpii

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 4.75 which gave the calculated distance to V1003 Scorpii as 686.66 light years away from Earth or 210.53 parsecs. It would take a spaceship travelling at the speed of light, 686.66 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 5.20 which put V1003 Scorpii at a distance of 627.24 light years or 192.31 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 7,224.00 Parsecs or 23,562.04 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Variable Type of V1003 Scorpii

The star is a rotating Rotating ellipsoidal variable type which means that its size changes over time. The Variable Type is usually named after the first star of that type to be spotted. V1003 Scorpii brightness ranges from a magnitude of 5.834 to a magnitude of 5.799 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.0 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.

V1003 Scorpii Facts

Alternative Names

Traditional/Proper NameV1003 Scorpii
Short NameV1003 Sco
Hipparcos Library I.D.81472
Henry Draper Designation149711

Visual Facts

Star Typesubgiant star
Absolute Magnitude-0.79 / -0.59
Visual / Apparent Magnitude5.83
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)16h 38m 26.30
Declination (Dec.)-43d23`54.2
Galactic Latitude2.37 degrees
Galactic Longitude340.39 degrees
1997 Distance from Earth4.75 Parallax (milliarcseconds)
 686.66 Light Years
 210.53 Parsecs
2007 Revised Distance from Earth5.20 Parallax (milliarcseconds)
 627.24 Light Years
 192.31 Parsecs
Galacto-Centric Distance23,562.04 Light Years / 7,224.00 Parsecs
Proper Motion Dec.-17.29 ± 1.11 milliarcseconds/year
Proper Motion RA.-13.08 ± 0.77 milliarcseconds/year
B-V Index-0.05
Radial Velocity1.20 ± 2.90 km/s
Spectral TypeB2.5IV
Colour(B) blue

Variable Star Details

Variable Star ClassRotating
Variable Star TypeRotating ellipsoidal
Mean Variability Period in Days0.026
Variable Magnitude Range (Brighter - Dimmer)5.799 - 5.834

Estimated Facts

Calculated Effective Temperature10,395 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

Multi-Star System

The star has been identified as being a multi-star system, one in which there is at least one star in close orbit to another star or two or more stars orbiting a central point. The stars may be of equal mass, unequal mass where one star is stronger than the other or be in groups orbiting a central point which doesn't necessarily have to be a star. More information can be found on my dedicated multiple star systems page. The source of the info is Simbad. The file is dated 2000 so any differences between this and any other source will be down to the actual source from where the information came from.

Proper Motion mas/yr
H.D. IdB.D. IdStar CodeMagnitudeR.A.Dec.SpectrumColourYear

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