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Epsilon Apodis, HD124771, HIP70248, HR5336

Epsilon Apodis is a blue eruptive main sequence dwarf star that can be located in the constellation of Apus. Epsilon Apodis is the brightest star in Apus based on the Hipparcos 2007 apparent magnitude. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

Epsilon Apodis is the Bayer Classification for the star. The Id of the star in the Yale Bright Star Catalogue is HR5336. HIP70248 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD124771.

Epsilon Apodis has alternative name(s), eps Aps.

Location of Epsilon Apodis

The location of the star in the galaxy 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 star is compared to the celestial equator and is expressed in degrees. For Epsilon Apodis, the location is 14h 22m 23.20 and -80d 06` 32.1 .

Proper Motion of Epsilon Apodis

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 -14.34 ± 0.18 miliarcseconds/year towards the north and -9.51 ± 0.22 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of Epsilon Apodis

Epsilon Apodis has a spectral type of B4V. This means the star is a blue main sequence dwarf star. The star is 7289.00000000 Parsecs from the Galactic Centre or terms of Light Years is 23774.0461441600000000s. The star has a B-V Colour Index of -0.1 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 11,677 Kelvin.

Epsilon Apodis Radius has been calculated as being 3.75 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 2,610,573.18.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 4.39. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

Epsilon Apodis Apparent and Absolute Magnitudes

Epsilon Apodis has an apparent magnitude of 5.06 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 -1.08 If you used the 2007 Parallax value, you would get an absolute magnitude of -1.42. 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 Epsilon Apodis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 5.92 which gave the calculated distance to Epsilon Apodis as 550.95 light years away from Earth or 168.92 parsecs. It would take a spaceship travelling at the speed of light, 550.95 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 5.06 which put Epsilon Apodis at a distance of 644.59 light years or 197.63 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.

The star's Galacto-Centric Distance is 7,289.00 Parsecs or 23,774.05 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Variable Type of Epsilon Apodis

The star is a eruptive Gamma Cassiopeiae 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. Epsilon Apodis brightness ranges from a magnitude of 5.039 to a magnitude of 4.992 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.

Epsilon Apodis Facts

Alternative Names

Short Nameeps Aps
Bayer DesignationEpsilon Apodis
Hipparcos Library I.D.70248
Yale Bright Star Catalogue (HR) Id5336
Henry Draper Designation124771

Visual Facts

Star Typemain sequence dwarf star
Absolute Magnitude-1.08 / -1.42
Visual / Apparent Magnitude5.06
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)14h 22m 23.20
Declination (Dec.)-80d 06` 32.1
Galactic Latitude-17.95 degrees
Galactic Longitude306.93 degrees
1997 Distance from Earth5.92 Parallax (milliarcseconds)
 550.95 Light Years
 168.92 Parsecs
2007 Revised Distance from Earth5.06 Parallax (milliarcseconds)
 644.59 Light Years
 197.63 Parsecs
Galacto-Centric Distance23,774.05 Light Years / 7,289.00 Parsecs
Proper Motion Dec.-14.34 ± 0.18 milliarcseconds/year
Proper Motion RA.-9.51 ± 0.22 milliarcseconds/year
B-V Index-0.10
Radial Velocity4.50 ± 4.20 km/s
Spectral TypeB4V
Colour(B) blue

Variable Star Details

Variable Star ClassEruptive
Variable Star TypeGamma Cassiopeiae
Mean Variability Period in Days0.067
Variable Magnitude Range (Brighter - Dimmer)4.992 - 5.039

Estimated Facts

Calculated Effective Temperature11,677 Kelvin

Sources and Links

SIMBAD SourceLink

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