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FW Lupi, HD136483, HIP75234

FW Lupi is a blue to white pulsating subgiant star that can be located in the constellation of Lupus. 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.

FW Lupi's Alternative Names

HIP75234 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD136483.

FW Lupi has alternative name(s) :- , FW Lup.

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

Location of FW Lupi

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 FW Lupi, the location is 15h 22m 25.38 and -40° 55` 36.1 .

Proper Motion of FW 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 -16.34 ± 0.69 miliarcseconds/year towards the north and -5.51 ± 1.18 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 3.00000 km/s with an error of about 3.00 km/s .

Physical Properties (Colour, Temperature) of FW Lupi

FW Lupi has a spectral type of F5IV. This means the star is a blue to white subgiant star. The star has a B-V Colour Index of 0.54 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 6,122 Kelvin.

FW Lupi Radius has been calculated as being 4.91 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 3,416,567.36.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 8.19. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures. The star's Iron Abundance is -0.20 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

FW Lupi Apparent and Absolute Magnitudes

FW Lupi has an apparent magnitude of 9.05 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 1.14 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.03. 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 FW Lupi

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 2.62 which gave the calculated distance to FW Lupi as 1244.90 light years away from Earth or 381.68 parsecs. It would take a spaceship travelling at the speed of light, 1244.90 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 1.57 which put FW Lupi at a distance of 2077.47 light years or 636.94 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.

Variable Type of FW Lupi

The star is a pulsating RR Lyrae type with asymmetric light curves 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. FW Lupi brightness ranges from a magnitude of 9.339 to a magnitude of 8.921 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.5 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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FW Lupi Facts

Visual Facts


Primary / Proper / Traditional NameFW Lupi
Alternative NamesHD 136483, HIP 75234, FW Lup
Spectral TypeF5IV
Multiple Star SystemNo / Unknown
Star TypeSubgiant Star
Colour blue to white
GalaxyMilky Way
ConstellationLupus
Absolute Magnitude1.14 / 0.03
Visual / Apparent Magnitude9.05
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)15h 22m 25.38
Declination (Dec.)-40° 55` 36.1
Galactic Latitude13.47 degrees
Galactic Longitude331.33 degrees
1997 Distance from Earth2.62 Parallax (milliarcseconds)
 1244.90 Light Years
 381.68 Parsecs
2007 Distance from Earth1.57 Parallax (milliarcseconds)
 2077.47 Light Years
 636.94 Parsecs
Proper Motion Dec.-16.34 ± 0.69 milliarcseconds/year
Proper Motion RA.-5.51 ± 1.18 milliarcseconds/year
B-V Index0.54
Radial Velocity3.00 ± 3.00 km/s
Iron Abundance-0.20 ± 9.99 Fe/H

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeRR Lyrae type with asymmetric light curves
Mean Variability Period in Days0.484
Variable Magnitude Range (Brighter - Dimmer)8.921 - 9.339

Estimated Facts


Calculated Effective Temperature6,122 Kelvin

Sources and Links


SIMBAD SourceLink

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