Universe Guide

Zeta1 Scorpii

Zeta1 Scorpii Facts

Zeta1 Scorpii's Alternative Names

Zeta1 Scorpii (Zet01 Sco) is the Bayer Classification for the star. The Bayer Classification was created by Johann Bayer in the early nineteenth century. The brightest star in the constellation is normally given the Alpha designation although there are exceptions such as Pollux which is Beta Geminorum.

The Id of the star in the Yale Bright Star Catalogue is HR6262. HIP82671 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD152236.

Zeta1 Scorpii has alternative name(s) :- , zet01 Sco.

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

Location of Zeta1 Scorpii

The location of the supergiant 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 Zeta1 Scorpii, the location is 16h 53m 59.73 and -42° 21` 43.3 .

Radial Velocity and Proper Motion of Zeta1 Scorpii

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 -4.01 ± 0.18 milliarcseconds/year towards the north and -1.01 ± 0.25 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 -26.00 km/s with an error of about 0.80 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.

Zeta1 Scorpii 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 6,328.69 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 Zeta1 Scorpii

Zeta1 Scorpii Colour and Temperature

Zeta1 Scorpii has a spectral type of B1Iae. This means the star is a blue supergiant star. The star has a B-V Colour Index of 0.44 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 6,276 Kelvin.

Zeta1 Scorpii Apparent and Absolute Magnitudes

Zeta1 Scorpii has an apparent magnitude of 4.70 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 If you used the 2007 Parallax value, you would get an absolute magnitude of -4.78. 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 Zeta1 Scorpii

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as -1.13 which gave the calculated distance to Zeta1 Scorpii as -2886.40 light years away from Earth or -884.96 parsecs. It would take a spaceship travelling at the speed of light, -2886.40 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 1.27 which put Zeta1 Scorpii at a distance of 2568.22 light years or 787.40 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 162,411,776.74 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 6,684.00 Parsecs or 21,800.76 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Variable Type of Zeta1 Scorpii

The star is a eruptive S Doradus. S Doradu 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. Zeta1 Scorpii brightness ranges from a magnitude of 4.884 to a magnitude of 4.785 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.1 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 Zeta1 Scorpii Facts and Figures

Visual Facts

Primary / Proper / Traditional NameZeta1 Scorpii
Alternative NamesZet01 Sco, HD 152236, HIP 82671, HR 6262, zet01 Sco
Spectral TypeB1Iae
Constellation's Main StarYes
Multiple Star SystemYes
Star Type very luminous Supergiant Star
GalaxyMilky Way
Absolute Magnitude / -4.78
Visual / Apparent Magnitude4.70
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)16h 53m 59.73
Declination (Dec.)-42° 21` 43.3
Galactic Latitude0.87 degrees
Galactic Longitude343.03 degrees
1997 Distance from Earth-1.13 Parallax (milliarcseconds)
 -2886.40 Light Years
 -884.96 Parsecs
2007 Distance from Earth1.27 Parallax (milliarcseconds)
 2568.22 Light Years
 787.40 Parsecs
 162,411,776.74 Astronomical Units
Galacto-Centric Distance21,800.76 Light Years / 6,684.00 Parsecs
Proper Motion Dec.-4.01 ± 0.18 milliarcseconds/year
Proper Motion RA.-1.01 ± 0.25 milliarcseconds/year
B-V Index0.44
Radial Velocity-26.00 ± 0.80 km/s
Semi-Major Axis6637.00
Stellar Luminosity (Lsun)6,328.69
Associated / Clustered StarsZeta2 Scorpii

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Variable Star Details

Variable Star ClassEruptive
Variable Star TypeS Doradus. S Doradu
Mean Variability Period in Days0.070
Variable Magnitude Range (Brighter - Dimmer)4.785 - 4.884

Estimated Calculated Facts

Effective Temperature6,276 Kelvin

Sources and Links

SIMBAD SourceLink

Scorpius Main Stars

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