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Beid (Omicron1 Eridani, 38 Eridani) Star Facts

Beid Facts

  • Beid is a pulsating giant star that can be located in the constellation of Eridanus. The description is based on the spectral class.
  • Beid is a main star of the constellation outline.
  • Based on the spectral type (F2II-III) of the star, the star's colour is yellow to white .
  • 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 121.70 light years away from us. Distance

Beid's Alternative Names

Omicron1 Eridani (Omi01 Eri) is the Bayer Classification for the star. The Bayer Classification was created by Johann Bayer in 1603. The brightest star in the constellation is normally given the Alpha designation, there are exceptions such as Pollux which is Beta Geminorum.

The Id of the star in the Yale Bright Star Catalogue is HR1298. HIP19587 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD26574.

Beid has alternative name(s) :- , omi01 Eri.

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 38 Eridani. The Flamsteed name can be shortened to 38 Eri.

The Gould star designation is one that was designed by American astronomer, Benjamin Apthorp Gould. Gould stars are predominantly in the Southern and Equatorial constellations but do appear in northern constellations such as Bootes and Orion. The star has the designation 185 G. Eridani. There are no stars with a Gould designation in Ursa Major for example.

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-07 764.

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

Location of Beid

The location of the 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 Beid, the location is 04h 11m 51.93 and -06° 50` 16.0 .

Radial Velocity and Proper Motion of Beid

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 81.92 ± 0.20 milliarcseconds/year towards the north and 10.76 ± 0.32 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 11.00000 km/s with an error of about 4.10 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 Beid

Beid Colour and Temperature

Based on the star's spectral type of F2II-III , Beid's colour and type is yellow to white giant star. The star has a B-V Colour Index of 0.32 which means the star's temperature is about 7,116 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

Beid 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 27.95 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

Beid Radius

Beid estimated radius has been calculated as being 3.68 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 2,563,923.45.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 3.5679597156722856309389582987. 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.

Beid Iron Abundance

Beid 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.

Beid Apparent and Absolute Magnitudes

Beid has an apparent magnitude of 4.04 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 1.11 If you used the 2007 Parallax value, you would get an absolute magnitude of 1.18. 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 Beid

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 25.98000 which gave the calculated distance to Beid as 125.54 light years away from Earth or 38.49 parsecs. If you want that in miles, it is about 738,002,629,349,470.40, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 26.80000 which put Beid at a distance of 121.70 light years or 37.31 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 7,695,686.30 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 7,428.00 Parsecs or 24,227.41 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 Beid

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)
Walking420,403,510,937.33
Car120680,117,031.24
Airbus A380736110,888,646.40
Speed of Sound (Mach 1)767.269106,369,531.09
Concorde (Mach 2)1,534.5453,184,696.23
New Horizons Probe33,0002,473,152.84
Speed of Light670,616,629.00121.70

Variable Type of Beid

The star is a pulsating Delta Scuti 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. Beid brightness ranges from a magnitude of 4.148 to a magnitude of 4.114 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 Beid Facts and Figures

Visual Facts


Primary / Proper / Traditional NameBeid
Alternative NamesOmicron1 Eridani, Omi01 Eri, HD 26574, HIP 19587, HR 1298, 185 G. Eridani, 38 Eridani, 38 Eri, BD-07 764, omi01 Eri
Spectral TypeF2II-III
Constellation's Main StarYes
Multiple Star SystemNo / Unknown
Star TypeGiant Star
ColourYellow - White
GalaxyMilky Way
ConstellationEridanus
Absolute Magnitude 1.11 / 1.18
Visual / Apparent Magnitude4.04
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)04h 11m 51.93
Declination (Dec.)-06° 50` 16.0
Galactic Latitude-38.39131986 degrees
Galactic Longitude199.32394255 degrees
1997 Distance from Earth25.98000 Parallax (milliarcseconds)
 125.54 Light Years
 38.49 Parsecs
2007 Distance from Earth26.80000 Parallax (milliarcseconds)
 121.70 Light Years
 37.31 Parsecs
 7,695,686.30 Astronomical Units
Galacto-Centric Distance24,227.41 Light Years / 7,428.00 Parsecs
Proper Motion Dec.81.92000 ± 0.20000 milliarcseconds/year
Proper Motion RA.10.76000 ± 0.32000 milliarcseconds/year
B-V Index0.32
Radial Velocity11.00000 ± 4.10 km/s
Iron Abundance0.2100 ± 9.99 Fe/H
Eccentricity0.21510
Semi-Major Axis9237.0000000
Stellar Luminosity (Lsun)27.9500000

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeDelta Scuti
Mean Variability Period in Days0.021
Variable Magnitude Range (Brighter - Dimmer)4.114 - 4.148

Estimated Calculated Facts


Radius (x the Sun)3.57
Effective Temperature7,116 Kelvin

Sources and Links


SIMBAD SourceLink

Location of Beid in Eridanus


Beid Location in Eridanus

The map was generated using Night Vision, an awesome free application by Brian Simpson.

Eridanus Main Stars


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