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VZ Persei, HIP12325

VZ Persei is a pulsating variable star that can be located in the constellation of Perseus. The description is based on the spectral class. VZ Persei is not part of the constellation but is within the borders of the constellation.

The star can not be seen by the naked eye, you need a telescope to see it.

VZ Persei's Alternative Names

HIP12325 is the reference name for the star in the Hipparcos Star Catalogue.

VZ Persei has alternative name(s) :- , VZ Per.

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

Location of VZ Persei

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 VZ Persei, the location is 02h 38m 43.09 and +55° 45` 59.4 .

Radial Velocity and Proper Motion of VZ 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 0.71 ± 1.16 miliarcseconds/year towards the north and -1.17 ± 2.00 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 the Sun is -16.00 km/s with an error of about 4.80 km/s . When the value is negative then the star and the Sun are getting closer to one another, likewise, a positive number means that two stars are moving away. Its nothing to fear as the stars are so far apart, they won't collide in our life-time, if ever.

Physical Properties (Temperature) of VZ Persei

VZ Persei has a spectral type of R4v. The star has a B-V Colour Index of 1.55 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 3,903 Kelvin.

VZ Persei Radius has been calculated as being 7.21 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 5,018,437.73.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 7.87. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

VZ Persei Apparent and Absolute Magnitudes

VZ Persei has an apparent magnitude of 10.62 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 2.26 If you used the 2007 Parallax value, you would get an absolute magnitude of 2.07. 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 VZ Persei

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 2.13 which gave the calculated distance to VZ Persei as 1531.28 light years away from Earth or 469.48 parsecs. It would take a spaceship travelling at the speed of light, 1531.28 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 1.95 which put VZ Persei at a distance of 1672.63 light years or 512.82 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.

Using the 2007 distance, the star is roughly 105,775,980.88 Astronomical Units from the Earth/Sun give or take a few. An Astronomical Unit is the distance between Earth and the Sun. The number of A.U. is the number of times that the star is from the Earth compared to the Sun.

Variable Type of VZ Persei

The star is a pulsating Slow Irregular 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. VZ Persei brightness ranges from a magnitude of 10.854 to a magnitude of 10.608 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.2 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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VZ Persei Facts

Visual Facts


Primary / Proper / Traditional NameVZ Persei
Alternative NamesHIP 12325, VZ Per
Spectral TypeR4v
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
GalaxyMilky Way
ConstellationPerseus
Absolute Magnitude 2.26 / 2.07
Visual / Apparent Magnitude10.62
Naked Eye VisibleRequires a 4.5 - 6 Inch Telescope - Magnitudes
Right Ascension (R.A.)02h 38m 43.09
Declination (Dec.)+55° 45` 59.4
Galactic Latitude-4.00 degrees
Galactic Longitude137.67 degrees
1997 Distance from Earth2.13 Parallax (milliarcseconds)
 1531.28 Light Years
 469.48 Parsecs
2007 Distance from Earth1.95 Parallax (milliarcseconds)
 1672.63 Light Years
 512.82 Parsecs
 105,775,980.88 Astronomical Units
Proper Motion Dec.0.71 ± 1.16 milliarcseconds/year
Proper Motion RA.-1.17 ± 2.00 milliarcseconds/year
B-V Index1.55
Radial Velocity-16.00 ± 4.80 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeSlow Irregular
Mean Variability Period in Days0.196
Variable Magnitude Range (Brighter - Dimmer)10.608 - 10.854

Estimated Facts


Calculated Effective Temperature3,903 Kelvin

Sources and Links


SIMBAD SourceLink

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