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Gorgonea Tertia, Rho Persei, 25 Persei, HD19058, HIP14354

Gorgonea Tertia (Rho Persei) is a red pulsating giant star that can be located in the constellation of Perseus. Gorgonea Tertia 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.

Rho Persei is the Bayer Classification for the star. HIP14354 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD19058.

Gorgonea Tertia has alternative name(s), rho Per.

Location of Gorgonea Tertia

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 Gorgonea Tertia, the location is 03h 05m 10.50 and +38d50`25.9 .

Proper Motion of Gorgonea Tertia

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 -105.70 ± 0.15 miliarcseconds/year towards the north and 129.22 ± 0.25 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of Gorgonea Tertia

Gorgonea Tertia has a spectral type of M3IIIvar. This means the star is a red giant star. The star is 7478.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24390.4948643200000000s. The star has a B-V Colour Index of 1.52 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 3,952 Kelvin.

Gorgonea Tertia Radius has been calculated as being 42.98 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 29,906,828.05.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 40.67. 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 -0.15 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

Gorgonea Tertia Apparent and Absolute Magnitudes

Gorgonea Tertia has an apparent magnitude of 3.32 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 -1.67 If you used the 2007 Parallax value, you would get an absolute magnitude of -1.55. 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 Gorgonea Tertia

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 10.03 which gave the calculated distance to Gorgonea Tertia as 325.19 light years away from Earth or 99.70 parsecs. It would take a spaceship travelling at the speed of light, 325.19 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 10.60 which put Gorgonea Tertia at a distance of 307.70 light years or 94.34 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 7,478.00 Parsecs or 24,390.49 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 Gorgonea Tertia

The star is a pulsating Semiregular late- (M, C, S or Me, Ce, Se) giants with poorly defined periodicity 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. Gorgonea Tertia brightness ranges from a magnitude of 3.427 to a magnitude of 3.230 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.

Gorgonea Tertia Facts

Alternative Names

Traditional/Proper NameGorgonea Tertia
Flamsteed Name25 Persei
Flamsteed Short Name25 Per
Short Namerho Per
Bayer DesignationRho Persei
Hipparcos Library I.D.14354
Bonner DurchmusterungBD+38 630
Henry Draper Designation19058

Visual Facts

Star Typegiant star
Absolute Magnitude-1.67 / -1.55
Visual / Apparent Magnitude3.32
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)03h 05m 10.50
Declination (Dec.)+38d50`25.9
Galactic Latitude-17.01 degrees
Galactic Longitude149.60 degrees
1997 Distance from Earth10.03 Parallax (milliarcseconds)
 325.19 Light Years
 99.70 Parsecs
2007 Revised Distance from Earth10.60 Parallax (milliarcseconds)
 307.70 Light Years
 94.34 Parsecs
Galacto-Centric Distance24,390.49 Light Years / 7,478.00 Parsecs
Proper Motion Dec.-105.70 ± 0.15 milliarcseconds/year
Proper Motion RA.129.22 ± 0.25 milliarcseconds/year
B-V Index1.52
Radial Velocity29.03 ± 0.15 km/s
Iron Abundance-0.15 ± 9.99 Fe/H
Spectral TypeM3IIIvar
Colour(M) Red

Variable Star Details

Variable Star ClassPulsating
Variable Star TypeSemiregular late- (M, C, S or Me, Ce, Se) giants with poorly defined periodicity
Mean Variability Period in Days0.169
Variable Magnitude Range (Brighter - Dimmer)3.230 - 3.427

Estimated Facts

Calculated Effective Temperature3,952 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

Location of Gorgonea Tertia in Perseus


Gorgonea Tertia (Rho Persei) Location in Perseus

The map was generated using Night Vision, an awesome free application by Brian Simpson.


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