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MW Pavonis, HD197070, HIP102508

MW Pavonis is a blue to white eclipsing binary system subgiant star that can be located in the constellation of Pavo. The star can not be seen by the naked eye, you need a telescope to see it.

HIP102508 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD197070.

MW Pavonis has alternative name(s), MW Pav.

Location of MW Pavonis

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 MW Pavonis, the location is 20h 46m 27.69 and -71d 56` 58.3 .

Proper Motion of MW Pavonis

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 -17.06 ± 0.81 miliarcseconds/year towards the north and 30.05 ± 0.96 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of MW Pavonis

MW Pavonis has a spectral type of F3IV/V. This means the star is a blue to white subgiant star. The star has a B-V Colour Index of 0.35 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 6,967 Kelvin.

MW Pavonis Radius has been calculated as being 2.32 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,611,664.03.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 2.33. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

MW Pavonis Apparent and Absolute Magnitudes

MW Pavonis has an apparent magnitude of 8.80 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 2.21 If you used the 2007 Parallax value, you would get an absolute magnitude of 2.20. 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 MW Pavonis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 4.80 which gave the calculated distance to MW Pavonis as 679.51 light years away from Earth or 208.33 parsecs. It would take a spaceship travelling at the speed of light, 679.51 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 4.78 which put MW Pavonis at a distance of 682.35 light years or 209.21 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 MW Pavonis

The star is a eclipsing binary system W Ursae Majoris 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. MW Pavonis brightness ranges from a magnitude of 9.148 to a magnitude of 8.711 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.8 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.

MW Pavonis Facts

Alternative Names

Traditional/Proper NameMW Pavonis
Short NameMW Pav
Hipparcos Library I.D.102508
Henry Draper Designation197070

Visual Facts

Star Typesubgiant star
Absolute Magnitude2.21 / 2.20
Visual / Apparent Magnitude8.80
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)20h 46m 27.69
Declination (Dec.)-71d 56` 58.3
Galactic Latitude-34.49 degrees
Galactic Longitude322.17 degrees
1997 Distance from Earth4.80 Parallax (milliarcseconds)
 679.51 Light Years
 208.33 Parsecs
2007 Revised Distance from Earth4.78 Parallax (milliarcseconds)
 682.35 Light Years
 209.21 Parsecs
Proper Motion Dec.-17.06 ± 0.81 milliarcseconds/year
Proper Motion RA.30.05 ± 0.96 milliarcseconds/year
B-V Index0.35
Radial Velocity-42.75 ± 1.38 km/s
Spectral TypeF3IV/V
Colour(F) blue to white

Variable Star Details

Variable Star ClassEclipsing binary system
Variable Star TypeW Ursae Majoris
Mean Variability Period in Days0.795
Variable Magnitude Range (Brighter - Dimmer)8.711 - 9.148

Estimated Facts

Calculated Effective Temperature6,967 Kelvin

Sources and Links

SIMBAD SourceLink

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