Universe Guide

EQ Pegasi

EQ Pegasi Facts

  • EQ Pegasi is a main sequence star that can be located in the constellation of Pegasus. The description is based on the spectral class.
  • EQ Pegasi is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (M6Ve) of the star, the star's colour is red .
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 20.16 light years away from us. Distance

Information on EQ Pegasi

EQ Pegasi is a double star consisting of A and B, the Hipparcos satellite recorded the two stars together whereas further analysis broke the star into two components.

EQ Pegasi's Alternative Names

HIP116132 is the reference name for the star in the Hipparcos Star Catalogue. The Gliese ID of the star is GL 896. The star was part of the original catalogue devised by German Astronomer Wilheim Gliese of stars located within 20 parsecs of Earth. Star Names

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+19 5116.

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

Location of EQ Pegasi

The location of the main sequence 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 EQ Pegasi, the location is 23h 31m 51.83 and +19° 56` 14.7 .

Radial Velocity and Proper Motion of EQ 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 -60.43 ± 1.11 milliarcseconds/year towards the north and 554.64 ± 1.66 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 1.50000 km/s with an error of about 0.40 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 EQ Pegasi

EQ Pegasi Temperature and Colour

Based on the star's spectral type of M6Ve , EQ Pegasi's colour and type is red main sequence star. The star has a B-V Colour Index of 1.19 which means the star's temperature is about 4,507 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

EQ 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 0.01 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

EQ Pegasi Radius

EQ Pegasi estimated radius has been calculated as being 0.09 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 65,088.47.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 0.0922612459022627096079428988. 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.

EQ Pegasi Iron Abundance

EQ Pegasi Iron Abundance is 0.10 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.

EQ Pegasi Apparent and Absolute Magnitudes

EQ Pegasi has an apparent magnitude of 10.05 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 11.07 If you used the 2007 Parallax value, you would get an absolute magnitude of 11.10. 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 EQ Pegasi

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 160.06000 which gave the calculated distance to EQ Pegasi as 20.38 light years away from Earth or 6.25 parsecs. If you want that in miles, it is about 119,806,385,105,481.97, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 161.76000 which put EQ Pegasi at a distance of 20.16 light years or 6.18 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 1,274,707.62 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 7,401.00 Parsecs or 24,139.35 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 EQ 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)
Airbus A38073618,369,064.19
Speed of Sound (Mach 1)767.26917,620,458.07
Concorde (Mach 2)1,534.548,810,217.55
New Horizons Probe33,000409,685.80
Speed of Light670,616,629.0020.16

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 EQ Pegasi Facts and Figures

Visual Facts

Primary / Proper / Traditional NameEQ Pegasi
Alternative NamesHIP 116132, BD+19 5116, Gliese 896
Spectral TypeM6Ve
Constellation's Main StarNo
Multiple Star SystemYes
Star Type Main Sequence Dwarf Star
GalaxyMilky Way
Absolute Magnitude 11.07 / 11.10
Visual / Apparent Magnitude10.05
Naked Eye VisibleRequires a 4.5 - 6 Inch Telescope - Magnitudes
Right Ascension (R.A.)23h 31m 51.83
Declination (Dec.)+19° 56` 14.7
Galactic Latitude-39.14124585 degrees
Galactic Longitude98.57423229 degrees
1997 Distance from Earth160.06000 Parallax (milliarcseconds)
 20.38 Light Years
 6.25 Parsecs
2007 Distance from Earth161.76000 Parallax (milliarcseconds)
 20.16 Light Years
 6.18 Parsecs
 1,274,707.62 Astronomical Units
Galacto-Centric Distance24,139.35 Light Years / 7,401.00 Parsecs
Proper Motion Dec.-60.43000 ± 1.11000 milliarcseconds/year
Proper Motion RA.554.64000 ± 1.66000 milliarcseconds/year
B-V Index1.19
Radial Velocity1.50000 ± 0.40 km/s
Iron Abundance0.1000 ± 9.99 Fe/H
Semi-Major Axis8080.0000000
Stellar Luminosity (Lsun)0.0100000
Associated / Clustered StarsEQ Pegasi A
EQ Pegasi B

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Estimated Calculated Facts

Radius (x the Sun)0.09
Effective Temperature4,507 Kelvin

Sources and Links

SIMBAD SourceLink

Multi-Star System

The star has been identified as being a multi-star system, one in which there is at least one star in close orbit to another star or two or more stars orbiting a central point. The stars may be of equal mass, unequal mass where one star is stronger than the other or be in groups orbiting a central point which doesn't necessarily have to be a star. More information can be found on my dedicated multiple star systems page. The source of the info is Simbad. The file is dated 2000 so any differences between this and any other source will be down to the actual source from where the information came from.

Proper Motion mas/yr
H.D. IdB.D. IdStar CodeMagnitudeR.A.Dec.SpectrumColourYear
+19 5116.0A10.70000

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