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52 Persei (52 Persei A) Star Facts

52 Persei Facts

52 Persei's Alternative Names

The Id of the star in the Yale Bright Star Catalogue is HR1306. HIP19811 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD26673.

Flamsteed designations are named after the creator, Sir John Flamsteed. Sir John numbered the stars in the constellation with a number and the latin name, this star's Flamsteed designation is 52 Persei A with it shortened to 52 Per A.

BD number is the number that the star was filed under in the Durchmusterung or Bonner Durchmusterung, a star catalogue that was put together by the Bonn Observatory between 1859 to 1903. The star's BD Number is BD+40 912.

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

Location of 52 Persei

The location of the luminous giant 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 object is compared to the celestial equator and is expressed in degrees. For 52 Persei, the location is 04h 14m 53.31 and +40° 29` 01.4 .

Radial Velocity and Proper Motion of 52 Persei

Proper Motion

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 -20.50 ± 0.51 milliarcseconds/year towards the north and 13.50 ± 0.99 milliarcseconds/year east if we saw them in the horizon.

Radial Velocity

The Radial Velocity, that is the speed at which the star is moving away/towards the Sun is -4.50 km/s with an error of about 0.74 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 (Colour, Temperature) of 52 Persei

52 Persei Colour and Temperature

52 Persei has a spectral type of G5II comp. This means the star is a yellow luminous giant star. The star has a B-V Colour Index of 1 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,973 Kelvin.

52 Persei Radius

Radius has been calculated as being 28.16 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 19,596,029.85.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 42.63. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

52 Persei Apparent and Absolute Magnitudes

52 Persei has an apparent magnitude of 4.67 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 -1.75 If you used the 2007 Parallax value, you would get an absolute magnitude of -2.65. 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 52 Persei

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 5.20 which gave the calculated distance to 52 Persei as 627.24 light years away from Earth or 192.31 parsecs. If you want that in miles, it is 5,590,043,653,614,017.08.

In 2007, Hipparcos data was revised with a new parallax of 3.43 which put 52 Persei at a distance of 950.91 light years or 291.55 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 60,136,085.23 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.

Time to Travel to 52 Persei

A note about the calculations, when I'm talking about years, I'm talking non-leap years only (365 days).

If you were to drive there at about 120 m.p.h. in a car with an infinity engine so you didn't have to pull over for petrol, it would take you 30,727,574,825,630.68 hours or 3,507,714,021.19 years.

At the time of writing, the fastest probe so far created is the New Horizon probe which is travelling at a speed of 33,000 m.p.h. If the probe was travelling to 52 Persei then it would take 111,736,635,729.57 hours / 12,755,323.71 years to get there. Speed Ref: N.A.S.A.

It would to take a spaceship journey travelling at the speed of light, 627.24 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

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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Additional 52 Persei Facts and Figures

Visual Facts


Primary / Proper / Traditional Name52 Persei
Alternative NamesF Per, HD 26673, HIP 19811, HR 1306, 52 Persei A, 52 Per A, BD+40 912
Spectral TypeG5II comp
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeLuminous Giant Star
ColourYellow
GalaxyMilky Way
ConstellationPerseus
Absolute Magnitude -1.75 / -2.65
Visual / Apparent Magnitude4.67
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)04h 14m 53.31
Declination (Dec.)+40° 29` 01.4
Galactic Latitude-7.54 degrees
Galactic Longitude159.45 degrees
1997 Distance from Earth5.20 Parallax (milliarcseconds)
 627.24 Light Years
 192.31 Parsecs
2007 Distance from Earth3.43 Parallax (milliarcseconds)
 950.91 Light Years
 291.55 Parsecs
 60,136,085.23 Astronomical Units
Proper Motion Dec.-20.50 ± 0.51 milliarcseconds/year
Proper Motion RA.13.50 ± 0.99 milliarcseconds/year
B-V Index1.00
Radial Velocity-4.50 ± 0.74 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Calculated Facts


Radius (x the Sun)42.63
Effective Temperature4,973 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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