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CD Phoenicis

CD Phoenicis Facts

CD Phoenicis's Alternative Names

HIP7940 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD10560.

CD Phoenicis has alternative name(s) :- CD Phe, CD Phe.

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

Location of CD Phoenicis

The location of the main sequence 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 Phoenicis, the location is 01h 42m 02.93 and -41° 07` 04.9 .

Radial Velocity and Proper Motion of CD Phoenicis

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 -12.95 ± 0.68 miliarcseconds/year towards the north and 10.09 ± 1.03 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 4.00 km/s with an error of about 10.00 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.

Physical Properties (Colour, Temperature) of CD Phoenicis

CD Phoenicis has a spectral type of A3Vn. This means the star is a blue main sequence star. The star has a B-V Colour Index of 0.16 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 8,017 Kelvin.

CD Phoenicis Radius has been calculated as being 1.95 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,359,392.04.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 2.37. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

CD Phoenicis Apparent and Absolute Magnitudes

CD Phoenicis has an apparent magnitude of 8.66 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 1.97 If you used the 2007 Parallax value, you would get an absolute magnitude of 1.55. 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 Phoenicis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 4.60 which gave the calculated distance to CD Phoenicis as 709.05 light years away from Earth or 217.39 parsecs. It would take a spaceship travelling at the speed of light, 709.05 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 3.78 which put CD Phoenicis at a distance of 862.87 light years or 264.55 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 54,566,974.26 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. CD Phoenicis brightness ranges from a magnitude of 8.739 to a magnitude of 8.688 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 3.2 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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Additional CD Phoenicis Facts and Figures

Visual Facts


Primary / Proper / Traditional NameCD Phoenicis
Alternative NamesCD Phe, HD 10560, HIP 7940, CD Phe
Spectral TypeA3Vn
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star Type main sequence Dwarf Star
ColourBlue
GalaxyMilky Way
ConstellationPhoenix
Absolute Magnitude 1.97 / 1.55
Visual / Apparent Magnitude8.66
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)01h 42m 02.93
Declination (Dec.)-41° 07` 04.9
Galactic Latitude-72.56 degrees
Galactic Longitude269.51 degrees
1997 Distance from Earth4.60 Parallax (milliarcseconds)
 709.05 Light Years
 217.39 Parsecs
2007 Distance from Earth 3.78 Parallax (milliarcseconds)
 862.87 Light Years
 264.55 Parsecs
 54,566,974.26 Astronomical Units
Proper Motion Dec.-12.95 ± 0.68 milliarcseconds/year
Proper Motion RA.10.09 ± 1.03 milliarcseconds/year
B-V Index0.16
Radial Velocity4.00 ± 10.00 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Mean Variability Period in Days3.212
Variable Magnitude Range (Brighter - Dimmer)8.688 - 8.739

Estimated Calculated Facts


Radius (x the Sun)2.37
Effective Temperature8,017 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


Comments and Questions

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