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Iota Mensae, HD38602, HIP26264, HR1991

Iota Mensae is a blue star that can be located in the constellation of Mensa. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

Iota Mensae is the Bayer Classification for the star. The Id of the star in the Yale Bright Star Catalogue is HR1991. HIP26264 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD38602.

Iota Mensae has alternative name(s), iot Men.

Location of Iota Mensae

The location of the star in the galaxy 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 Iota Mensae, the location is 05h 35m 36.13 and -78d 49` 15.2 .

Proper Motion of Iota Mensae

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 18.21 ± 0.32 miliarcseconds/year towards the north and 12.29 ± 0.35 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 12.60000 km/s with an error of about 4.30 km/s .

Physical Properties (Colour, Temperature, Radius) of Iota Mensae

Iota Mensae has a spectral type of B8III. This means the star is a blue star. The star is 7325.00000000 Parsecs from the Galactic Centre or terms of Light Years is 23891.4649480000000000s. The star has a B-V Colour Index of -0.01 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 9,679 Kelvin.

Iota Mensae Radius has been calculated as being 5.03 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 3,497,322.54.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 5.39. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

Iota Mensae Apparent and Absolute Magnitudes

Iota Mensae has an apparent magnitude of 6.04 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 -0.90 If you used the 2007 Parallax value, you would get an absolute magnitude of -1.05. 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 Iota Mensae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 4.10 which gave the calculated distance to Iota Mensae as 795.52 light years away from Earth or 243.90 parsecs. It would take a spaceship travelling at the speed of light, 795.52 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 3.82 which put Iota Mensae at a distance of 853.83 light years or 261.78 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.

The star's Galacto-Centric Distance is 7,325.00 Parsecs or 23,891.46 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*. Iota Mensae brightness ranges from a magnitude of 6.049 to a magnitude of 6.035 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 2.4 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.

Iota Mensae Facts

Alternative Names

Short Nameiot Men
Bayer DesignationIota Mensae
Hipparcos Library I.D.26264
Yale Bright Star Catalogue (HR) Id1991
Henry Draper Designation38602

Visual Facts

Star Type star
Absolute Magnitude-0.90 / -1.05
Visual / Apparent Magnitude6.04
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)05h 35m 36.13
Declination (Dec.)-78d 49` 15.2
Galactic Latitude-30.22 degrees
Galactic Longitude290.68 degrees
1997 Distance from Earth4.10 Parallax (milliarcseconds)
 795.52 Light Years
 243.90 Parsecs
2007 Revised Distance from Earth3.82 Parallax (milliarcseconds)
 853.83 Light Years
 261.78 Parsecs
Galacto-Centric Distance23,891.46 Light Years / 7,325.00 Parsecs
Proper Motion Dec.18.21 ± 0.32 milliarcseconds/year
Proper Motion RA.12.29 ± 0.35 milliarcseconds/year
B-V Index-0.01
Radial Velocity12.60 ± 4.30 km/s
Spectral TypeB8III
Colour(B) blue

Variable Star Details

Mean Variability Period in Days2.373
Variable Magnitude Range (Brighter - Dimmer)6.035 - 6.049

Estimated Facts

Calculated Effective Temperature9,679 Kelvin

Sources and Links

SIMBAD SourceLink

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