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56 Pegasi

56 Pegasi Facts

56 Pegasi's Alternative Names

The Id of the star in the Yale Bright Star Catalogue is HR8796. HIP114155 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD218356.

56 Pegasi has alternative name(s) :- , NSV 14429.

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 56 Pegasi with it shortened to 56 Peg.

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+24 4716.

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

Location of 56 Pegasi

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 56 Pegasi, the location is 23h 07m 06.74 and +25° 28` 06.0 .

Radial Velocity and Proper Motion of 56 Pegasi

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 -33.07 ± 0.15 milliarcseconds/year towards the north and -0.03 ± 0.23 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 -27.55 km/s with an error of about 0.26 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.

56 Pegasi Luminosity

Luminosity is the amount of energy that a star pumps out and its relative to the amount that our star, the Sun gives out. The figure of 680.27 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

Physical Properties (Colour, Temperature) of 56 Pegasi

56 Pegasi Colour and Temperature

56 Pegasi has a spectral type of K0IIp. This means the star is a orange to red luminous giant star. The star has a B-V Colour Index of 1.28 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,422 Kelvin.

56 Pegasi Radius

Radius has been calculated as being 29.22 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 20,331,214.06.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 32.19. 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 -0.21 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

56 Pegasi Apparent and Absolute Magnitudes

56 Pegasi has an apparent magnitude of 4.76 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 -1.32 If you used the 2007 Parallax value, you would get an absolute magnitude of -1.53. 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 56 Pegasi

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 6.07 which gave the calculated distance to 56 Pegasi as 537.34 light years away from Earth or 164.74 parsecs. It would take a spaceship travelling at the speed of light, 537.34 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 5.51 which put 56 Pegasi at a distance of 591.95 light years or 181.49 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 37,434,738.84 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.

The star's Galacto-Centric Distance is 7,416.00 Parsecs or 24,188.27 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*. 56 Pegasi brightness ranges from a magnitude of 4.935 to a magnitude of 4.896 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.0 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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Additional 56 Pegasi Facts and Figures

Visual Facts


Primary / Proper / Traditional Name56 Pegasi
Alternative NamesHD 218356, HIP 114155, HR 8796, 56 Peg, BD+24 4716, NSV 14429
Spectral TypeK0IIp
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeLuminous Giant Star
ColourOrange to Red
GalaxyMilky Way
ConstellationPegasus
Absolute Magnitude -1.32 / -1.53
Visual / Apparent Magnitude4.76
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)23h 07m 06.74
Declination (Dec.)+25° 28` 06.0
Galactic Latitude-31.71 degrees
Galactic Longitude 95.12 degrees
1997 Distance from Earth6.07 Parallax (milliarcseconds)
 537.34 Light Years
 164.74 Parsecs
2007 Distance from Earth5.51 Parallax (milliarcseconds)
 591.95 Light Years
 181.49 Parsecs
 37,434,738.84 Astronomical Units
Galacto-Centric Distance24,188.27 Light Years / 7,416.00 Parsecs
Proper Motion Dec.-33.07 ± 0.15 milliarcseconds/year
Proper Motion RA.-0.03 ± 0.23 milliarcseconds/year
B-V Index1.28
Radial Velocity-27.55 ± 0.26 km/s
Iron Abundance-0.21 ± 9.99 Fe/H
Eccentricity0.21
Semi-Major Axis6220.00
Stellar Luminosity (Lsun)680.27

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Mean Variability Period in Days0.028
Variable Magnitude Range (Brighter - Dimmer)4.896 - 4.935

Estimated Calculated Facts


Radius (x the Sun)32.19
Effective Temperature4,422 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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