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Zeta1 Scorpii, HD152236, HIP82671, HR6262

Zeta1 Scorpii is a blue eruptive star that can be located in the constellation of Scorpius. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

Zeta1 Scorpii is the Bayer Classification for the star. 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.

Location of Zeta1 Scorpii

The location of the star in the galaxy 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 star is compared to the celestial equator and is expressed in degrees. For Zeta1 Scorpii, the location is 16h 53m 59.73 and -42d 21` 43.3 .

Proper Motion of Zeta1 Scorpii

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 miliarcseconds/year towards the north and -1.01 ± 0.25 miliarcseconds/year east if we saw them in the horizon. The Radial Velocity, that is the speed at which the star is moving away/towards us is -26.00000 km/s with an error of about 0.80 km/s .

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 280000.0000000 that I have given is based on the Spectral Types page that I have found on the Internet. You might find a different figure, one that may have been calculated rather than generalised that I have done. The figure is always the amount times the luminosity of the Sun. It is an imprecise figure because of a number of factors including but not limited to whether the star is a variable star and distance.

Physical Properties (Colour, Temperature, Radius) of Zeta1 Scorpii

Zeta1 Scorpii has a spectral type of B1Iae. This means the star is a blue star. The star is 6684.00000000 Parsecs from the Galactic Centre or terms of Light Years is 21800.7579129600000000s. 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. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

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.

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 Doradus is a star in the Large Magellanic Cloud, not the Milky Way 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.

Zeta1 Scorpii Facts

Alternative Names

Short Namezet01 Sco
Bayer DesignationZeta1 Scorpii
Hipparcos Library I.D.82671
Yale Bright Star Catalogue (HR) Id6262
Henry Draper Designation152236

Visual Facts

Star Type star
Visual / Apparent Magnitude4.70
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)16h 53m 59.73
Declination (Dec.)-42d 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 Revised Distance from Earth1.27 Parallax (milliarcseconds)
 2568.22 Light Years
 787.40 Parsecs
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
Spectral TypeB1Iae
Associated / Clustered StarsZeta2 Scorpii
Colour(B) blue

Variable Star Details

Variable Star ClassEruptive
Variable Star TypeS Doradus. S Doradus is a star in the Large Magellanic Cloud, not the Milky Way
Mean Variability Period in Days0.070
Variable Magnitude Range (Brighter - Dimmer)4.785 - 4.884

Estimated Facts

Luminosity (x the Sun)280,000.0000000
Calculated Effective Temperature6,276 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

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