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AB Pyxidis

AB Pyxidis Facts

AB Pyxidis's Alternative Names

HIP41726 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD72268.

AB Pyxidis has alternative name(s) :- , AB Pyx.

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

Location of AB Pyxidis

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 AB Pyxidis, the location is 08h 30m 29.80 and -36° 43` 16.8 .

Physical Properties (Colour, Temperature) of AB Pyxidis

AB Pyxidis Colour and Temperature

AB Pyxidis has a spectral type of M3/M4Ib. This means the star is a red supergiant star. The star has a B-V Colour Index of 1.9 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 2,472 Kelvin.

AB Pyxidis Radius

Radius has been calculated as being 315.39 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 219,447,064.03.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.

AB Pyxidis Apparent and Absolute Magnitudes

AB Pyxidis has an apparent magnitude of 6.78 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 -3.96 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 AB Pyxidis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 0.71 which gave the calculated distance to AB Pyxidis as 4593.85 light years away from Earth or 1408.45 parsecs. It would take a spaceship travelling at the speed of light, 4593.85 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

Variable Type of AB Pyxidis

The star is a pulsating Slow 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. AB Pyxidis brightness ranges from a magnitude of 6.886 to a magnitude of 6.579 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.3 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 AB Pyxidis Facts and Figures

Visual Facts


Primary / Proper / Traditional NameAB Pyxidis
Alternative NamesHD 72268, HIP 41726, AB Pyx
Spectral TypeM3/M4Ib
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star Type very luminous Supergiant Star less luminour Supergiant Star
ColourRed
GalaxyMilky Way
ConstellationPyxis
Absolute Magnitude -3.96
Visual / Apparent Magnitude6.78
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)08h 30m 29.80
Declination (Dec.)-36° 43` 16.8
Galactic Latitude1.50 degrees
Galactic Longitude256.21 degrees
Distance from Earth0.71 Parallax (milliarcseconds)
 4593.85 Light Years
 1408.45 Parsecs
 290,511,642.05 Astronomical Units
B-V Index1.90
Radial Velocity 24.90 ± 0.60 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeSlow Irregular
Mean Variability Period in Days0.285
Variable Magnitude Range (Brighter - Dimmer)6.579 - 6.886

Estimated Calculated Facts


Radius (x the Sun)315.39
Effective Temperature2,472 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


Comments and Questions

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