Universe Guide

CD Velorum

CD Velorum Facts

CD Velorum's Alternative Names

HIP47796 is the reference name for the star in the Hipparcos Star Catalogue.

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

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

Location of CD Velorum

The location of the variable 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 object is compared to the celestial equator and is expressed in degrees. For CD Velorum, the location is 09h 44m 38.27 and -45° 52` 37.4 .

Proper Motion of CD 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 32.95 ± 2.85 milliarcseconds/year towards the north and -41.32 ± 3.60 milliarcseconds/year east if we saw them in the horizon. . 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.

Physical Properties (Colour) of CD Velorum

CD Velorum Colour and Temperature

CD Velorum has a spectral type of F. This means the star is a yellow to white variable star.

CD Velorum Apparent and Absolute Magnitudes

CD Velorum has an apparent magnitude of 12.29 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 6.92 If you used the 2007 Parallax value, you would get an absolute magnitude of 7.55. 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 CD Velorum

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 8.43 which gave the calculated distance to CD Velorum as 386.91 light years away from Earth or 118.62 parsecs. It would take a spaceship travelling at the speed of light, 386.91 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 11.27 which put CD Velorum at a distance of 289.41 light years or 88.73 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 18,301,748.73 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.

Variable Type of CD Velorum

The star is a pulsating RR Lyrae type with a 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. CD Velorum brightness ranges from a magnitude of 12.561 to a magnitude of 11.518 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.6 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 CD Velorum Facts and Figures

Visual Facts

Primary / Proper / Traditional NameCD Velorum
Alternative NamesCD Vel, HIP 47796, CD Vel
Spectral TypeF
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
ColourYellow - White
GalaxyMilky Way
Absolute Magnitude 6.92 / 7.55
Visual / Apparent Magnitude12.29
Naked Eye VisibleRequires a 4.5 - 6 Inch Telescope - Magnitudes
Right Ascension (R.A.)09h 44m 38.27
Declination (Dec.)-45° 52` 37.4
Galactic Latitude5.60 degrees
Galactic Longitude272.33 degrees
1997 Distance from Earth8.43 Parallax (milliarcseconds)
 386.91 Light Years
 118.62 Parsecs
2007 Distance from Earth11.27 Parallax (milliarcseconds)
 289.41 Light Years
 88.73 Parsecs
 18,301,748.73 Astronomical Units
Proper Motion Dec.32.95 ± 2.85 milliarcseconds/year
Proper Motion RA.-41.32 ± 3.60 milliarcseconds/year
B-V Index-99.00

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Variable Star Details

Variable Star ClassPulsating
Variable Star TypeRR Lyrae type with a
Mean Variability Period in Days0.574
Variable Magnitude Range (Brighter - Dimmer)11.518 - 12.561

Sources and Links

SIMBAD SourceLink

Related Stars

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