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V929 Scorpii, HD144334, HIP78877

Primary Facts on V929 Scorpii

  • V929 Scorpii's star type is rotating main sequence dwarf star that can be located in the constellation of Scorpius. The description is based on the spectral class.
  • V929 Scorpii is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (B8V) of the star, the star's colour is blue .
  • The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 526.07 light years away from us.

V929 Scorpii's Alternative Names

HIP78877 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD144334.

V929 Scorpii has alternative name(s) :- , V929 Sco.

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

Location of V929 Scorpii

The location of the 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 star is compared to the celestial equator and is expressed in degrees. For V929 Scorpii, the location is 16h 06m 06.38 and -23° 36` 22.5 .

Radial Velocity and Proper Motion of V929 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 -27.81 ± 0.39 miliarcseconds/year towards the north and -12.62 ± 0.67 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 the Sun is -6.60 km/s with an error of about 4.30 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.

V929 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 148.02 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 V929 Scorpii

V929 Scorpii has a spectral type of B8V. This means the star is a blue main sequence dwarf star. The star is 7,254.00 Parsecs from the Galactic Centre or in terms of Light Years is 23,659.89 s. The star has a B-V Colour Index of -0.07 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 10,845 Kelvin.

V929 Scorpii Radius has been calculated as being 2.61 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,815,216.47.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 2.82. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

V929 Scorpii Apparent and Absolute Magnitudes

V929 Scorpii has an apparent magnitude of 5.90 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 0.03 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.14. 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 V929 Scorpii

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 6.70 which gave the calculated distance to V929 Scorpii as 486.81 light years away from Earth or 149.25 parsecs. It would take a spaceship travelling at the speed of light, 486.81 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 6.20 which put V929 Scorpii at a distance of 526.07 light years or 161.29 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 33,268,218.78 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 7,254.00 Parsecs or 23,659.89 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 V929 Scorpii

The star is a rotating SX Arietis 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. V929 Scorpii brightness ranges from a magnitude of 5.907 to a magnitude of 5.869 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 1.5 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.

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Additional V929 Scorpii Facts and Figures

Visual Facts

Primary / Proper / Traditional NameV929 Scorpii
Alternative NamesHD 144334, HIP 78877, V929 Sco
Spectral TypeB8V
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star Type main sequence Dwarf Star
Colour blue
GalaxyMilky Way
Absolute Magnitude 0.03 / -0.14
Visual / Apparent Magnitude5.90
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)16h 06m 06.38
Declination (Dec.)-23° 36` 22.5
Galactic Latitude20.85 degrees
Galactic Longitude350.35 degrees
1997 Distance from Earth6.70 Parallax (milliarcseconds)
 486.81 Light Years
 149.25 Parsecs
2007 Distance from Earth6.20 Parallax (milliarcseconds)
 526.07 Light Years
 161.29 Parsecs
 33,268,218.78 Astronomical Units
Galacto-Centric Distance23,659.89 Light Years / 7,254.00 Parsecs
Proper Motion Dec.-27.81 ± 0.39 milliarcseconds/year
Proper Motion RA.-12.62 ± 0.67 milliarcseconds/year
B-V Index-0.07
Radial Velocity-6.60 ± 4.30 km/s
Semi-Major Axis6962.00
Stellar Luminosity (Lsun)148.02

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Variable Star Details

Variable Star ClassRotating
Variable Star TypeSX Arietis
Mean Variability Period in Days1.495
Variable Magnitude Range (Brighter - Dimmer)5.869 - 5.907

Estimated Facts

Calculated Effective Temperature10,845 Kelvin

Sources and Links

SIMBAD SourceLink

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