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CX Circini

CX Circini Facts

  • CX Circini is a eruptive supergiant star that can be located in the constellation of Circinus. The description is based on the spectral class.
  • CX Circini is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (B2Ia) of the star, the star's colour is blue .
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • The star is calculated at being about -3882.90 light years away from us. Distance

CX Circini's Alternative Names

HIP74660 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD134959.

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

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

Location of CX Circini

The location of the supergiant 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 CX Circini, the location is 15h 15m 24.09 and -59° 04` 29.3 .

Physical Properties of CX Circini

CX Circini Temperature and Colour

Based on the star's spectral type of B2Ia , CX Circini's colour and type is blue supergiant star. The star has a B-V Colour Index of 1 which means the star's temperature is about 4,973 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

CX Circini Radius

CX Circini Apparent and Absolute Magnitudes

CX Circini has an apparent magnitude of 8.11 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 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 CX Circini

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as -0.84000 which gave the calculated distance to CX Circini as -3882.90 light years away from Earth or -1190.48 parsecs. If you want that in miles, it is about -22,826,114,461,534,639.27, based on 1 Ly = 5,878,625,373,183.61 miles.

Variable Type of CX Circini

The star is a eruptive 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. CX Circini brightness ranges from a magnitude of 8.229 to a magnitude of 8.036 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 CX Circini Facts and Figures

Visual Facts


Primary / Proper / Traditional NameCX Circini
Alternative NamesHD 134959, HIP 74660, CX Cir
Spectral TypeB2Ia
Constellation's Main StarNo
Multiple Star SystemYes
Star Type very luminous Supergiant Star
ColourBlue
GalaxyMilky Way
ConstellationCircinus
Visual / Apparent Magnitude8.11
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)15h 15m 24.09
Declination (Dec.)-59° 04` 29.3
Galactic Latitude-1.20837845 degrees
Galactic Longitude320.51419594 degrees
Distance from Earth-0.84000 Parallax (milliarcseconds)
 -3882.90 Light Years
 -1190.48 Parsecs
 -245,552,415.51 Astronomical Units
B-V Index1
Radial Velocity-49.00000 ± 6.80 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassEruptive
Variable Star TypeIrregular
Mean Variability Period in Days0.147
Variable Magnitude Range (Brighter - Dimmer)8.036 - 8.229

Estimated Calculated Facts


Effective Temperature4,973 Kelvin

Sources and Links


SIMBAD SourceLink

Multi-Star System

The star has been identified as being a multi-star system, one in which there is at least one star in close orbit to another star or two or more stars orbiting a central point. The stars may be of equal mass, unequal mass where one star is stronger than the other or be in groups orbiting a central point which doesn't necessarily have to be a star. More information can be found on my dedicated multiple star systems page. The source of the info is Simbad. The file is dated 2000 so any differences between this and any other source will be down to the actual source from where the information came from.


Proper Motion mas/yr
H.D. IdB.D. IdStar CodeMagnitudeR.A.Dec.SpectrumColourYear
134959-58 5866.4A8.200003.000002.00000B0Blue/White
B11.500001871
C11.500001917
D12.200001917

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