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GY Velorum, HD89273, HIP50332

GY Velorum is a red pulsating giant star that can be located in the constellation of Vela. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

GY Velorum's Alternative Names

HIP50332 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD89273.

GY Velorum has alternative name(s) :- , GY Vel.

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

Location of GY Velorum

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 GY Velorum, the location is 10h 16m 40.17 and -51° 12` 16.8 .

Proper Motion of GY Velorum

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 11.71 ± 0.26 miliarcseconds/year towards the north and -41.32 ± 0.33 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 42.40000 km/s with an error of about 0.40 km/s .

GY Velorum 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 331.6100000 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 GY Velorum

GY Velorum has a spectral type of M4/M5III. This means the star is a red giant star. The star is 7366.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24025.1919190400000000s. The star has a B-V Colour Index of 1.43 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,110 Kelvin.

GY Velorum Radius has been calculated as being 22.76 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 15,838,305.02.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 23.29. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

GY Velorum Apparent and Absolute Magnitudes

GY Velorum has an apparent magnitude of 6.20 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 -0.46 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.51. 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 GY Velorum

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 4.66 which gave the calculated distance to GY Velorum as 699.92 light years away from Earth or 214.59 parsecs. It would take a spaceship travelling at the speed of light, 699.92 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 4.56 which put GY Velorum at a distance of 715.27 light years or 219.30 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 7,366.00 Parsecs or 24,025.19 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 GY Velorum

The star is a pulsating Slow Irregular 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. GY Velorum brightness ranges from a magnitude of 6.241 to a magnitude of 6.067 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.2 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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GY Velorum Facts

Visual Facts

Alternative NamesHD 89273, HIP 50332, GY Vel
Star TypeGiant Star
GalaxyMilky Way
Absolute Magnitude-0.46 / -0.51
Visual / Apparent Magnitude6.20
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)10h 16m 40.17
Declination (Dec.)-51° 12` 16.8
Galactic Latitude4.58 degrees
Galactic Longitude279.80 degrees
1997 Distance from Earth4.66 Parallax (milliarcseconds)
 699.92 Light Years
 214.59 Parsecs
2007 Revised Distance from Earth4.56 Parallax (milliarcseconds)
 715.27 Light Years
 219.30 Parsecs
Galacto-Centric Distance24,025.19 Light Years / 7,366.00 Parsecs
Proper Motion Dec.11.71 ± 0.26 milliarcseconds/year
Proper Motion RA.-41.32 ± 0.33 milliarcseconds/year
B-V Index1.43
Radial Velocity42.40 ± 0.40 km/s
Semi-Major Axis5377.00
Stellar Luminosity (Lsun)331.61
Spectral TypeM4/M5III
Colour(M) Red

Variable Star Details

Variable Star ClassPulsating
Variable Star TypeSlow Irregular
Mean Variability Period in Days0.164
Variable Magnitude Range (Brighter - Dimmer)6.067 - 6.241

Estimated Facts

Calculated Effective Temperature4,110 Kelvin

Sources and Links

SIMBAD SourceLink

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