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RT Octantis

RT Octantis Facts

RT Octantis's Alternative Names

HIP113652 is the reference name for the star in the Hipparcos Star Catalogue.

RT Octantis has alternative name(s) :- RT Oct, RT Oct.

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

Location of RT Octantis

The location of the variable 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 RT Octantis, the location is 23h 01m 06.18 and -87° 03` 10.9 .

Physical Properties (Colour, Temperature) of RT Octantis

RT Octantis Colour and Temperature

RT Octantis has a spectral type of Me. This means the star is a red variable star. The star has a B-V Colour Index of 1.24 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,494 Kelvin.

RT Octantis Apparent and Absolute Magnitudes

RT Octantis has an apparent magnitude of 10.35 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 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 RT Octantis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as -2.25 which gave the calculated distance to RT Octantis as -1449.61 light years away from Earth or -444.44 parsecs. It would take a spaceship travelling at the speed of light, -1449.61 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

Variable Type of RT Octantis

The star is a pulsating Omicron Ceti 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. RT Octantis brightness ranges from a magnitude of 14.048 to a magnitude of 9.829 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 177.9 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 RT Octantis Facts and Figures

Visual Facts


Primary / Proper / Traditional NameRT Octantis
Alternative NamesRT Oct, HIP 113652, RT Oct
Spectral TypeMe
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
ColourRed
GalaxyMilky Way
ConstellationOctans
Visual / Apparent Magnitude10.35
Naked Eye VisibleRequires a 4.5 - 6 Inch Telescope - Magnitudes
Right Ascension (R.A.)23h 01m 06.18
Declination (Dec.)-87° 03` 10.9
Galactic Latitude-29.73 degrees
Galactic Longitude304.50 degrees
Distance from Earth-2.25 Parallax (milliarcseconds)
 -1449.61 Light Years
 -444.44 Parsecs
 -91,671,691.71 Astronomical Units
B-V Index1.24

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeOmicron Ceti
Mean Variability Period in Days177.900
Variable Magnitude Range (Brighter - Dimmer)9.829 - 14.048

Estimated Calculated Facts


Effective Temperature4,494 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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