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R Velorum, HD87816, HIP49477

R Velorum is a orange to red giant star that can be located in the constellation of Vela. The star can not be seen by the naked eye, you need a telescope to see it.

R Velorum's Alternative Names

HIP49477 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD87816.

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

Location of R 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 R Velorum, the location is 10h 06m 07.26 and -52° 11` 16.7 .

Proper Motion of R 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 16.25 ± 0.31 miliarcseconds/year towards the north and -55.20 ± 0.40 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 4.70000 km/s with an error of about 0.40 km/s .

R 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 51.9000000 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 R Velorum

R Velorum has a spectral type of K0III. This means the star is a orange to red giant star. The star is 7381.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24074.1164206400000000s. The star has a B-V Colour Index of 0.99 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,868 Kelvin.

R Velorum Radius has been calculated as being 7.95 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 5,529,374.30.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 8.63. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

R Velorum Apparent and Absolute Magnitudes

R Velorum has an apparent magnitude of 6.50 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 1.09 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.91. 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 R Velorum

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 8.28 which gave the calculated distance to R Velorum as 393.92 light years away from Earth or 120.77 parsecs. It would take a spaceship travelling at the speed of light, 393.92 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 7.61 which put R Velorum at a distance of 428.60 light years or 131.41 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 7,381.00 Parsecs or 24,074.12 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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R Velorum Facts

Visual Facts

Alternative NamesHD 87816, HIP 49477
Star TypeGiant Star
GalaxyMilky Way
Absolute Magnitude1.09 / 0.91
Visual / Apparent Magnitude6.50
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)10h 06m 07.26
Declination (Dec.)-52° 11` 16.7
Galactic Latitude2.84 degrees
Galactic Longitude279.02 degrees
1997 Distance from Earth8.28 Parallax (milliarcseconds)
 393.92 Light Years
 120.77 Parsecs
2007 Revised Distance from Earth7.61 Parallax (milliarcseconds)
 428.60 Light Years
 131.41 Parsecs
Galacto-Centric Distance24,074.12 Light Years / 7,381.00 Parsecs
Proper Motion Dec.16.25 ± 0.31 milliarcseconds/year
Proper Motion RA.-55.20 ± 0.40 milliarcseconds/year
B-V Index0.99
Radial Velocity4.70 ± 0.40 km/s
Semi-Major Axis7700.00
Stellar Luminosity (Lsun)51.90
Spectral TypeK0III
Colour(K) Orange to Red

Estimated Facts

Calculated Effective Temperature4,868 Kelvin

Sources and Links

SIMBAD SourceLink

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