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56 Pegasi

56 Pegasi Facts

  • 56 Pegasi is a luminous giant star that can be located in the constellation of Pegasus. The description is based on the spectral class.
  • 56 Pegasi is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (K0IIp) of the star, the star's colour is orange to red .
  • The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 591.95 light years away from us. Distance

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 named the stars in the constellation with a number and its latin name, this star's Flamsteed designation is 56 Pegasi. The Flamsteed name can be 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 -27.55000 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.

Physical Properties of 56 Pegasi

56 Pegasi Temperature and Colour

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

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.

56 Pegasi Radius

56 Pegasi estimated 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 32.187033361149051717773969778. The figure is derived at by using the formula from SDSS rather than peer reviewed papers. It has been known to produce widely incorrect figures.

56 Pegasi Iron Abundance

56 Pegasi 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. The value comes from the Hipparcos Extended Catalog.

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 6.07000 which gave the calculated distance to 56 Pegasi as 537.34 light years away from Earth or 164.74 parsecs. If you want that in miles, it is about 3,158,820,558,026,481.00, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 5.51000 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*.

Travel Time to 56 Pegasi

The time it will take to travel to this star is dependent on how fast you are going. U.G. has done some calculations as to how long it will take going at differing speeds. A note about the calculations, when I'm talking about years, I'm talking non-leap years only (365 days).

The New Horizons space probe is the fastest probe that we've sent into space at the time of writing. Its primary mission was to visit Pluto which at the time of launch (2006), Pluto was still a planet.

DescriptionSpeed (m.p.h.)Time (years)
Walking499,242,878,384.14
Car1203,308,095,946.14
Airbus A380736539,363,469.48
Speed of Sound (Mach 1)767.269517,382,448.05
Concorde (Mach 2)1,534.54258,690,886.87
New Horizons Probe33,00012,029,439.80
Speed of Light670,616,629.00591.95
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-31.70883355 degrees
Galactic Longitude95.12012897 degrees
1997 Distance from Earth6.07000 Parallax (milliarcseconds)
 537.34 Light Years
 164.74 Parsecs
2007 Distance from Earth5.51000 Parallax (milliarcseconds)
 591.95 Light Years
 181.49 Parsecs
 37,434,738.84 Astronomical Units
Galacto-Centric Distance 24,188.27 Light Years / 7,416.00 Parsecs
Proper Motion Dec.-33.07000 ± 0.15000 milliarcseconds/year
Proper Motion RA.-0.03000 ± 0.23000 milliarcseconds/year
B-V Index1.28
Radial Velocity-27.55000 ± 0.26 km/s
Iron Abundance-0.2100 ± 9.99 Fe/H
Eccentricity0.21300
Semi-Major Axis6220.0000000
Stellar Luminosity (Lsun)680.2700000

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

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