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SW Lyncis, HD67008, HIP39771

SW Lyncis is a blue to white eclipsing binary system main sequence dwarf star that can be located in the constellation of Lynx. The star can not be seen by the naked eye, you need a telescope to see it.

HIP39771 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD67008.

SW Lyncis has alternative name(s), SW Lyn.

Location of SW Lyncis

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 SW Lyncis, the location is 08h 07m 41.59 and +41d 48` 02.1 .

Proper Motion of SW Lyncis

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 -39.21 ± 0.70 miliarcseconds/year towards the north and -20.81 ± 1.59 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 32.39000 km/s with an error of about 1.35 km/s .

Physical Properties (Colour, Temperature, Radius) of SW Lyncis

SW Lyncis has a spectral type of F1V. This means the star is a blue to white main sequence dwarf star. The star has a B-V Colour Index of 0.25 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 7,483 Kelvin.

SW Lyncis Radius has been calculated as being 2.29 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,596,678.55.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 2.53. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

SW Lyncis Apparent and Absolute Magnitudes

SW Lyncis has an apparent magnitude of 9.58 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 1.92 If you used the 2007 Parallax value, you would get an absolute magnitude of 1.71. 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 SW Lyncis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 2.94 which gave the calculated distance to SW Lyncis as 1109.40 light years away from Earth or 340.14 parsecs. It would take a spaceship travelling at the speed of light, 1109.40 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 2.67 which put SW Lyncis at a distance of 1221.59 light years or 374.53 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 SW Lyncis

The star is a eclipsing binary system Beta Lyrae (Sheliak) 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. SW Lyncis brightness ranges from a magnitude of 10.284 to a magnitude of 9.583 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.6 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.

SW Lyncis Facts

Alternative Names

Traditional/Proper NameSW Lyncis
Short NameSW Lyn
Hipparcos Library I.D.39771
Bonner DurchmusterungBD+42 1811
Henry Draper Designation67008

Visual Facts

Star Typemain sequence dwarf star
Absolute Magnitude1.92 / 1.71
Visual / Apparent Magnitude9.58
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)08h 07m 41.59
Declination (Dec.)+41d 48` 02.1
Galactic Latitude31.37 degrees
Galactic Longitude178.55 degrees
1997 Distance from Earth2.94 Parallax (milliarcseconds)
 1109.40 Light Years
 340.14 Parsecs
2007 Revised Distance from Earth2.67 Parallax (milliarcseconds)
 1221.59 Light Years
 374.53 Parsecs
Proper Motion Dec.-39.21 ± 0.70 milliarcseconds/year
Proper Motion RA.-20.81 ± 1.59 milliarcseconds/year
B-V Index0.25
Radial Velocity32.39 ± 1.35 km/s
Spectral TypeF1V
Colour(F) blue to white

Variable Star Details

Variable Star ClassEclipsing binary system
Variable Star TypeBeta Lyrae (Sheliak)
Mean Variability Period in Days0.644
Variable Magnitude Range (Brighter - Dimmer)9.583 - 10.284

Estimated Facts

Calculated Effective Temperature7,483 Kelvin

Sources and Links

SIMBAD SourceLink

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