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Iota Lupi, HD125238, HIP69996, HR5354

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

Iota Lupi's Alternative Names

Iota Lupi is the Bayer Classification for the star. The Id of the star in the Yale Bright Star Catalogue is HR5354. HIP69996 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD125238.

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

Location of Iota Lupi

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 Lupi, the location is 14h 19m 24.23 and -46° 03` 29.1 .

Proper Motion of Iota Lupi

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 -4.76 ± 0.11 miliarcseconds/year towards the north and -12.56 ± 0.20 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 21.60000 km/s with an error of about 4.10 km/s .

Iota Lupi Luminosity

Luminosity is the amount of energy that a star pumps out and its relative to the amount that our star, the Sun gives out. The figure of 1,282.62 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

Physical Properties (Colour, Temperature) of Iota Lupi

Iota Lupi has a spectral type of B2.5IV. This means the star is a blue subgiant star. The star is 7,325.00 Parsecs from the Galactic Centre or terms of Light Years is 23,891.46 s. The star has a B-V Colour Index of -0.18 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 15,433 Kelvin.

Iota Lupi Radius has been calculated as being 2.74 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,907,668.57.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 2.64. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

Iota Lupi Apparent and Absolute Magnitudes

Iota Lupi has an apparent magnitude of 3.55 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 -1.61 If you used the 2007 Parallax value, you would get an absolute magnitude of -1.53. 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 Lupi

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 9.27 which gave the calculated distance to Iota Lupi as 351.85 light years away from Earth or 107.87 parsecs. It would take a spaceship travelling at the speed of light, 351.85 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 9.65 which put Iota Lupi at a distance of 337.99 light years or 103.63 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*.

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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Iota Lupi Facts

Visual Facts


 Iota Lupi
Alternative NamesHD 125238, HIP 69996, HR 5354
Spectral TypeB2.5IV
Multiple Star SystemNo / Unknown
Star TypeSubgiant Star
Colour blue
GalaxyMilky Way
ConstellationLupus
Absolute Magnitude-1.61 / -1.53
Visual / Apparent Magnitude3.55
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)14h 19m 24.23
Declination (Dec.)-46° 03` 29.1
Galactic Latitude14.14 degrees
Galactic Longitude318.48 degrees
1997 Distance from Earth9.27 Parallax (milliarcseconds)
 351.85 Light Years
 107.87 Parsecs
2007 Distance from Earth9.65 Parallax (milliarcseconds)
 337.99 Light Years
 103.63 Parsecs
Galacto-Centric Distance23,891.46 Light Years / 7,325.00 Parsecs
Proper Motion Dec.-4.76 ± 0.11 milliarcseconds/year
Proper Motion RA.-12.56 ± 0.20 milliarcseconds/year
B-V Index-0.18
Radial Velocity21.60 ± 4.10 km/s
Eccentricity0.13
Semi-Major Axis6961.00
Stellar Luminosity (Lsun)1,282.62

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Facts


Calculated Effective Temperature15,433 Kelvin

Sources and Links


SIMBAD SourceLink

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