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CW Circini

CW Circini Facts

CW Circini's Alternative Names

HIP74654 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD134958.

CW Circini has alternative name(s) :- , CW Cir.

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

Location of CW Circini

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 CW Circini, the location is 15h 15m 16.18 and -58° 10` 22.4 .

Physical Properties (Colour, Temperature) of CW Circini

CW Circini has a spectral type of B0.5Vne. This means the star is a blue main sequence star. The star has a B-V Colour Index of 0.27 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 7,375 Kelvin.

CW Circini Radius has been calculated as being 13.91 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 9,680,164.30.km. If you need the diameter of the star, you just need to multiple the radius by 2. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

CW Circini Apparent and Absolute Magnitudes

CW Circini has an apparent magnitude of 8.16 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. Using the supplied Parallax value, you would get an absolute magnitude of -1.93 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 CW Circini

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 0.96 which gave the calculated distance to CW Circini as 3397.53 light years away from Earth or 1041.67 parsecs. It would take a spaceship travelling at the speed of light, 3397.53 years to get there. We don't have the technology or spaceship that can carry people over that distance yet. CW Circini brightness ranges from a magnitude of 8.275 to a magnitude of 8.170 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.1 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 CW Circini Facts and Figures

Visual Facts


Primary / Proper / Traditional NameCW Circini
Alternative NamesHD 134958, HIP 74654, CW Cir
Spectral TypeB0.5Vne
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star Type main sequence Dwarf Star
ColourBlue
GalaxyMilky Way
ConstellationCircinus
Absolute Magnitude -1.93
Visual / Apparent Magnitude8.16
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)15h 15m 16.18
Declination (Dec.)-58° 10` 22.4
Galactic Latitude-0.43 degrees
Galactic Longitude320.97 degrees
Distance from Earth0.96 Parallax (milliarcseconds)
 3397.53 Light Years
 1041.67 Parsecs
 214,858,363.57 Astronomical Units
B-V Index0.27
Radial Velocity-10.00 ± 14.00 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Mean Variability Period in Days0.084
Variable Magnitude Range (Brighter - Dimmer)8.170 - 8.275

Estimated Calculated Facts


Radius (x the Sun)13.91
Effective Temperature7,375 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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