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S Apodis, HD133444, HIP74179

S Apodis is a carbon red eruptive variable star that can be located in the constellation of Apus. The description is based on the spectral class. The star can not be seen by the naked eye, you need a telescope to see it.

S Apodis's Alternative Names

HIP74179 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD133444.

S Apodis has alternative name(s) :- , S Aps.

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

Location of S Apodis

The location of the 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 star is compared to the celestial equator and is expressed in degrees. For S Apodis, the location is 15h 09m 24.55 and -72° 03` 45.2 .

Proper Motion of S 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 -2.96 ± 1.02 miliarcseconds/year towards the north and -7.52 ± 1.37 miliarcseconds/year east if we saw them in the horizon. The Radial Velocity, that is the speed at which the star is moving away/towards us is -75.00000 km/s with an error of about 999.00 km/s .

Physical Properties (Colour, Temperature) of S Apodis

S Apodis has a spectral type of C+. This means the star is a carbon red variable star. The star has a B-V Colour Index of 1.25 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,476 Kelvin.

S Apodis Apparent and Absolute Magnitudes

S Apodis has an apparent magnitude of 9.72 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 If you used the 2007 Parallax value, you would get an absolute magnitude of -1.18. 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 S Apodis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as -0.89 which gave the calculated distance to S Apodis as -3664.76 light years away from Earth or -1123.60 parsecs. It would take a spaceship travelling at the speed of light, -3664.76 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 0.66 which put S Apodis at a distance of 4941.87 light years or 1515.15 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.

Variable Type of S Apodis

The star is a eruptive R Coronae Borealis 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. S Apodis brightness ranges from a magnitude of 10.467 to a magnitude of 9.713 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.7 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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S Apodis Facts

Visual Facts


Primary / Proper / Traditional NameS Apodis
Alternative NamesHD 133444, HIP 74179, S Aps
Spectral TypeC+
Multiple Star SystemNo / Unknown
Star TypeVariable Star
Colour carbon red
GalaxyMilky Way
ConstellationApus
Visual / Apparent Magnitude9.72
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)15h 09m 24.55
Declination (Dec.)-72° 03` 45.2
Galactic Latitude-12.00 degrees
Galactic Longitude313.20 degrees
1997 Distance from Earth-0.89 Parallax (milliarcseconds)
 -3664.76 Light Years
 -1123.60 Parsecs
2007 Distance from Earth0.66 Parallax (milliarcseconds)
 4941.87 Light Years
 1515.15 Parsecs
Proper Motion Dec.-2.96 ± 1.02 milliarcseconds/year
Proper Motion RA.-7.52 ± 1.37 milliarcseconds/year
B-V Index1.25
Radial Velocity-75.00 ± 999.00 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassEruptive
Variable Star TypeR Coronae Borealis
Mean Variability Period in Days0.696
Variable Magnitude Range (Brighter - Dimmer)9.713 - 10.467

Estimated Facts


Calculated Effective Temperature4,476 Kelvin

Sources and Links


SIMBAD SourceLink

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