Universe Guide

Alpha Apodis

Alpha Apodis Facts

Alpha Apodis's Alternative Names

Alpha Apodis (Alf Aps) is the Bayer Classification for the star. The Bayer Classification was created by Johann Bayer in the early nineteenth century. The brightest star in the constellation is normally given the Alpha designation although there are exceptions such as Pollux which is Beta Geminorum.

The Id of the star in the Yale Bright Star Catalogue is HR5470. HIP72370 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD129078.

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

Location of Alpha Apodis

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 Alpha Apodis, the location is 14h 47m 51.73 and -79° 02` 41.0 .

Radial Velocity and Proper Motion of Alpha Apodis

Proper Motion

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 -15.88 ± 0.11 milliarcseconds/year towards the north and -4.58 ± 0.13 milliarcseconds/year east if we saw them in the horizon.

Radial Velocity

The Radial Velocity, that is the speed at which the star is moving away/towards the Sun is -0.10 km/s with an error of about 0.70 km/s . 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.

Alpha Apodis Luminosity

Luminosity is the amount of energy that a star pumps out and its relative to the amount that our star, the Sun gives out. The figure of 1,161.51 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

Physical Properties (Colour, Temperature) of Alpha Apodis

Alpha Apodis Colour and Temperature

Alpha Apodis has a spectral type of K5III. This means the star is a orange to red giant star. The star has a B-V Colour Index of 1.43 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,110 Kelvin.

Alpha Apodis Radius

Radius has been calculated as being 39.74 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 27,651,620.11.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 43.18. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

Alpha Apodis Apparent and Absolute Magnitudes

Alpha Apodis has an apparent magnitude of 3.83 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 -1.67 If you used the 2007 Parallax value, you would get an absolute magnitude of -1.85. 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 Alpha Apodis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 7.93 which gave the calculated distance to Alpha Apodis as 411.30 light years away from Earth or 126.10 parsecs. It would take a spaceship travelling at the speed of light, 411.30 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 7.30 which put Alpha Apodis at a distance of 446.80 light years or 136.99 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 28,256,018.92 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.

The star's Galacto-Centric Distance is 7,319.00 Parsecs or 23,871.90 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

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.

Hide Explanations
Show GridLines

Additional Alpha Apodis Facts and Figures

Visual Facts

Primary / Proper / Traditional NameAlpha Apodis
Alternative NamesAlf Aps, HD 129078, HIP 72370, HR 5470
Spectral TypeK5III
Constellation's Main StarYes
Multiple Star SystemNo / Unknown
Star TypeGiant Star
ColourOrange to Red
GalaxyMilky Way
Absolute Magnitude -1.67 / -1.85
Visual / Apparent Magnitude3.83
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)14h 47m 51.73
Declination (Dec.) -79° 02` 41.0
Galactic Latitude-17.45 degrees
Galactic Longitude308.49 degrees
1997 Distance from Earth7.93 Parallax (milliarcseconds)
 411.30 Light Years
 126.10 Parsecs
2007 Distance from Earth7.30 Parallax (milliarcseconds)
 446.80 Light Years
 136.99 Parsecs
 28,256,018.92 Astronomical Units
Galacto-Centric Distance23,871.90 Light Years / 7,319.00 Parsecs
Proper Motion Dec.-15.88 ± 0.11 milliarcseconds/year
Proper Motion RA.-4.58 ± 0.13 milliarcseconds/year
B-V Index1.43
Radial Velocity-0.10 ± 0.70 km/s
Semi-Major Axis8130.00
Stellar Luminosity (Lsun)1,161.51

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Estimated Calculated Facts

Radius (x the Sun)43.18
Effective Temperature4,110 Kelvin

Sources and Links

SIMBAD SourceLink

Location of Alpha Apodis in Apus

Alpha Apodis Location in Apus

The map was generated using Night Vision, an awesome free application by Brian Simpson.

Apus Main Stars

Comments and Questions

There's no register feature and no need to give an email address if you don't need to. All messages will be reviewed before being displayed. Comments may be merged or altered slightly such as if an email address is given in the main body of the comment.

You can decline to give a name which if that is the case, the comment will be attributed to a random star. A name is preferred even if its a random made up one by yourself.

This website is using cookies. More info. That's Fine