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V573 Persei, HD20277, HIP15241

V573 Persei is a white to yellow pulsating subgiant star that can be located in the constellation of Perseus. V573 Persei is the brightest star in Perseus based on the Hipparcos 2007 apparent magnitude. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

HIP15241 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD20277.

V573 Persei has alternative name(s), V573 Per.

Location of V573 Persei

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 V573 Persei, the location is 03h 16m 35.19 and +32d11`03.2 .

Proper Motion of V573 Persei

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 -85.98 ± 0.77 miliarcseconds/year towards the north and -6.74 ± 1.18 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of V573 Persei

V573 Persei has a spectral type of G8IV. This means the star is a white to yellow subgiant star. The star is 7511.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24498.1287678400000000s. The star has a B-V Colour Index of 0.98 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,888 Kelvin.

V573 Persei Radius has been calculated as being 14.02 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 9,752,748.09.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 11.19. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

V573 Persei Apparent and Absolute Magnitudes

V573 Persei has an apparent magnitude of 5.98 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 -0.16 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.33. 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 V573 Persei

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 5.92 which gave the calculated distance to V573 Persei as 550.95 light years away from Earth or 168.92 parsecs. It would take a spaceship travelling at the speed of light, 550.95 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 7.43 which put V573 Persei at a distance of 438.98 light years or 134.59 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 7,511.00 Parsecs or 24,498.13 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Variable Type of V573 Persei

The star is a pulsating Semi-Regular Star which are giants or supergiants of intermediate and late spectral 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. V573 Persei brightness ranges from a magnitude of 6.188 to a magnitude of 6.108 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.1 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.

V573 Persei Facts

Alternative Names

Traditional/Proper NameV573 Persei
Short NameV573 Per
Hipparcos Library I.D.15241
Bonner DurchmusterungBD+31 576
Henry Draper Designation20277

Visual Facts

Star Typesubgiant star
Absolute Magnitude-0.16 / 0.33
Visual / Apparent Magnitude5.98
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)03h 16m 35.19
Declination (Dec.)+32d11`03.2
Galactic Latitude-21.36 degrees
Galactic Longitude155.47 degrees
1997 Distance from Earth5.92 Parallax (milliarcseconds)
 550.95 Light Years
 168.92 Parsecs
2007 Revised Distance from Earth7.43 Parallax (milliarcseconds)
 438.98 Light Years
 134.59 Parsecs
Galacto-Centric Distance24,498.13 Light Years / 7,511.00 Parsecs
Proper Motion Dec.-85.98 ± 0.77 milliarcseconds/year
Proper Motion RA.-6.74 ± 1.18 milliarcseconds/year
B-V Index0.98
Radial Velocity17.00 ± 0.90 km/s
Spectral TypeG8IV
Colour(G) White to Yellow

Variable Star Details

Variable Star ClassPulsating
Variable Star TypeSemi-Regular Star which are giants or supergiants of intermediate and late spectral
Mean Variability Period in Days0.062
Variable Magnitude Range (Brighter - Dimmer)6.108 - 6.188

Estimated Facts

Calculated Effective Temperature4,888 Kelvin

Sources and Links

SIMBAD SourceLink

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