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R40, HD6884, HIP5267

R40 is a blue supergiant star that can be located in the constellation of Tucana. 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.

R40's Alternative Names

HIP5267 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD6884.

R40 has alternative name(s) :- , SMC V2018.

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

Location of R40

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 R40, the location is 01h 07m 18.22 and -72° 28` 03.6 .

Physical Properties (Colour, Temperature) of R40

R40 has a spectral type of B8Iab:e. This means the star is a blue supergiant star. The star has a B-V Colour Index of 0.09 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 8,573 Kelvin.

R40 Apparent and Absolute Magnitudes

R40 has an apparent magnitude of 10.27 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 R40

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as -1.88 which gave the calculated distance to R40 as -1734.91 light years away from Earth or -531.91 parsecs. It would take a spaceship travelling at the speed of light, -1734.91 years to get there. We don't have the technology or spaceship that can carry people over that distance yet. R40 brightness ranges from a magnitude of 10.397 to a magnitude of 10.180 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.2 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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R40 Facts

Visual Facts


Primary / Proper / Traditional NameR40
Alternative NamesHD 6884, HIP 5267, SMC V2018
Spectral Type B8Iab:e
Multiple Star SystemNo / Unknown
Star Type very luminous Supergiant Star
Colour blue
GalaxyMilky Way
ConstellationTucana
Visual / Apparent Magnitude10.27
Naked Eye VisibleRequires a 4.5 - 6 Inch Telescope - Magnitudes
Right Ascension (R.A.)01h 07m 18.22
Declination (Dec.)-72° 28` 03.6
Galactic Latitude-44.61 degrees
Galactic Longitude301.25 degrees
Distance from Earth-1.88 Parallax (milliarcseconds)
 -1734.91 Light Years
 -531.91 Parsecs
B-V Index0.09
Radial Velocity170.00 ± 4.70 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Mean Variability Period in Days0.182
Variable Magnitude Range (Brighter - Dimmer)10.180 - 10.397

Estimated Facts


Calculated Effective Temperature8,573 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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