Universe Guide

AE Pyxidis

AE Pyxidis Facts

  • AE Pyxidis is a giant star that can be located in the constellation of Pyxis. The description is based on the spectral class.
  • AE Pyxidis is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (K5III) of the star, the star's colour is orange to red .
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 6939.65 light years away from us. Distance

AE Pyxidis's Alternative Names

HIP42469 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD73805.

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

BD number is the number that the star was filed under in the Durchmusterung or Bonner Durchmusterung, a star catalogue that was put together by the Bonn Observatory between 1859 to 1903. The star's BD Number is BD-21 2538.

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

Location of AE Pyxidis

The location of the giant 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 AE Pyxidis, the location is 08h 39m 29.77 and -21° 55` 33.4 .

Proper Motion of AE Pyxidis

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 1.46 ± 0.55 milliarcseconds/year towards the north and 1.73 ± 0.84 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 of AE Pyxidis

AE Pyxidis Colour and Temperature

Based on the star's spectral type of K5III , AE Pyxidis's colour and type is orange to red giant star. The star has a B-V Colour Index of 1.6 which means the star's temperature is about 3,779 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

AE Pyxidis Radius

AE Pyxidis estimated radius has been calculated as being 42.28 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 29,420,373.62.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 111.73377558470481455056121078. The figure is derived at by using the formula from SDSS rather than peer reviewed papers. It has been known to produce widely incorrect figures.

AE Pyxidis Apparent and Absolute Magnitudes

AE Pyxidis has an apparent magnitude of 8.09 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 -1.44 If you used the 2007 Parallax value, you would get an absolute magnitude of -3.55. 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 AE Pyxidis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 1.24000 which gave the calculated distance to AE Pyxidis as 2630.35 light years away from Earth or 806.45 parsecs. If you want that in miles, it is about 15,462,842,250,353,508.56, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 0.47000 which put AE Pyxidis at a distance of 6939.65 light years or 2127.66 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 438,858,319.65 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.

Travel Time to AE Pyxidis

The time it will take to travel to this star is dependent on how fast you are going. U.G. has done some calculations as to how long it will take going at differing speeds. A note about the calculations, when I'm talking about years, I'm talking non-leap years only (365 days).

The New Horizons space probe is the fastest probe that we've sent into space at the time of writing. Its primary mission was to visit Pluto which at the time of launch (2006), Pluto was still a planet.

DescriptionSpeed (m.p.h.)Time (years)
Airbus A3807366,323,158,545.43
Speed of Sound (Mach 1)767.2696,065,466,856.40
Concorde (Mach 2)1,534.543,032,729,475.57
New Horizons Probe33,000141,025,596.65
Speed of Light670,616,629.006,939.65
AE Pyxidis brightness ranges from a magnitude of 8.248 to a magnitude of 8.166 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 AE Pyxidis Facts and Figures

Visual Facts

Primary / Proper / Traditional NameAE Pyxidis
Alternative NamesHD 73805, HIP 42469, BD-21 2538, AE Pyx
Spectral TypeK5III
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeGiant Star
ColourOrange to Red
GalaxyMilky Way
Absolute Magnitude -1.44 / -3.55
Visual / Apparent Magnitude8.09
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)08h 39m 29.77
Declination (Dec.)-21° 55` 33.4
Galactic Latitude11.81424728 degrees
Galactic Longitude245.33102001 degrees
1997 Distance from Earth1.24000 Parallax (milliarcseconds)
 2630.35 Light Years
 806.45 Parsecs
2007 Distance from Earth0.47000 Parallax (milliarcseconds)
 6939.65 Light Years
 2127.66 Parsecs
 438,858,319.65 Astronomical Units
Proper Motion Dec.1.46000 ± 0.55000 milliarcseconds/year
Proper Motion RA.1.73000 ± 0.84000 milliarcseconds/year
B-V Index1.6

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Variable Star Details

Mean Variability Period in Days0.050
Variable Magnitude Range (Brighter - Dimmer)8.166 - 8.248

Estimated Calculated Facts

Radius (x the Sun)111.73
Effective Temperature3,779 Kelvin

Sources and Links

SIMBAD SourceLink

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