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GP Eridani

GP Eridani Facts

GP Eridani's Alternative Names

HIP18291 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD24714.

GP Eridani has alternative name(s) :- , GP Eri.

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

Location of GP Eridani

The location of the variable 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 GP Eridani, the location is 03h 54m 42.44 and -29° 14` 25.9 .

Physical Properties (Colour, Temperature) of GP Eridani

GP Eridani has a spectral type of M2/M3. This means the star is a red variable star. The star has a B-V Colour Index of 1.49 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,035 Kelvin.

GP Eridani Apparent and Absolute Magnitudes

GP Eridani has an apparent magnitude of 9.97 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. Using the supplied Parallax value, you would get an absolute magnitude of 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 GP Eridani

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as -0.99 which gave the calculated distance to GP Eridani as -3294.58 light years away from Earth or -1010.10 parsecs. It would take a spaceship travelling at the speed of light, -3294.58 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

Variable Type of GP Eridani

The star is a pulsating Semi-Regular Star w 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. GP Eridani brightness ranges from a magnitude of 10.216 to a magnitude of 9.663 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.5 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 GP Eridani Facts and Figures

Visual Facts


Primary / Proper / Traditional NameGP Eridani
Alternative NamesHD 24714, HIP 18291, GP Eri
Spectral TypeM2/M3
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
ColourRed
GalaxyMilky Way
ConstellationEridanus
Visual / Apparent Magnitude9.97
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)03h 54m 42.44
Declination (Dec.)-29° 14` 25.9
Galactic Latitude-49.82 degrees
Galactic Longitude227.05 degrees
Distance from Earth-0.99 Parallax (milliarcseconds)
 -3294.58 Light Years
 -1010.10 Parsecs
 -208,346,629.01 Astronomical Units
B-V Index1.49

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeSemi-Regular Star w
Mean Variability Period in Days0.465
Variable Magnitude Range (Brighter - Dimmer)9.663 - 10.216

Estimated Calculated Facts


Effective Temperature4,035 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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