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DF Octantis

DF Octantis Facts

DF Octantis's Alternative Names

HIP101572 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD194973.

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

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

Location of DF Octantis

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 DF Octantis, the location is 20h 35m 06.56 and -75° 09` 59.5 .

Proper Motion of DF Octantis

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 -14.61 ± 0.69 milliarcseconds/year towards the north and 11.55 ± 0.93 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 (Colour, Temperature) of DF Octantis

DF Octantis Colour and Temperature

DF Octantis has a spectral type of M3III. This means the star is a red giant star. The star has a B-V Colour Index of 1.66 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 3,608 Kelvin.

DF Octantis Radius

Radius has been calculated as being 31.07 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 21,620,232.92.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 25.61. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

DF Octantis Apparent and Absolute Magnitudes

DF Octantis has an apparent magnitude of 8.88 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 -0.57 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.15. 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 DF Octantis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 1.29 which gave the calculated distance to DF Octantis as 2528.40 light years away from Earth or 775.19 parsecs. If you want that in miles, it is 12,290,971,143,998,539.04.

In 2007, Hipparcos data was revised with a new parallax of 1.56 which put DF Octantis at a distance of 2090.79 light years or 641.03 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 132,221,007.42 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.

Time to Travel to DF Octantis

A note about the calculations, when I'm talking about years, I'm talking non-leap years only (365 days).

If you were to drive there at about 120 m.p.h. in a car with an infinity engine so you didn't have to pull over for petrol, it would take you 123,862,636,612,978.45 hours or 14,139,570,389.61 years.

At the time of writing, the fastest probe so far created is the New Horizon probe which is travelling at a speed of 33,000 m.p.h. If the probe was travelling to DF Octantis then it would take 450,409,587,683.56 hours / 51,416,619.60 years to get there. Speed Ref: N.A.S.A.

It would to take a spaceship journey travelling at the speed of light, 2528.40 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

DF Octantis brightness ranges from a magnitude of 8.995 to a magnitude of 8.852 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 DF Octantis Facts and Figures

Visual Facts


Primary / Proper / Traditional NameDF Octantis
Alternative NamesHD 194973, HIP 101572, DF Oct
Spectral TypeM3III
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeGiant Star
ColourRed
GalaxyMilky Way
ConstellationOctans
Absolute Magnitude -0.57 / -0.15
Visual / Apparent Magnitude8.88
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)20h 35m 06.56
Declination (Dec.)-75° 09` 59.5
Galactic Latitude-32.71 degrees
Galactic Longitude318.81 degrees
1997 Distance from Earth1.29 Parallax (milliarcseconds)
 2528.40 Light Years
 775.19 Parsecs
2007 Distance from Earth1.56 Parallax (milliarcseconds)
 2090.79 Light Years
 641.03 Parsecs
 132,221,007.42 Astronomical Units
Proper Motion Dec.-14.61 ± 0.69 milliarcseconds/year
Proper Motion RA.11.55 ± 0.93 milliarcseconds/year
B-V Index1.66

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Mean Variability Period in Days0.089
Variable Magnitude Range (Brighter - Dimmer)8.852 - 8.995

Estimated Calculated Facts


Radius (x the Sun)25.61
Effective Temperature3,608 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


Comments and Questions

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