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Zeta2 Scorpii, HD152334, HIP82729, HR6271

Primary Facts on Zeta2 Scorpii

  • Zeta2 Scorpii's star type is giant star that can be located in the constellation of Scorpius. The description is based on the spectral class.
  • Zeta2 Scorpii is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (K4III) of the star, the star's colour is orange to red .
  • 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 132.32 light years away from us.

Zeta2 Scorpii's Alternative Names

Zeta2 Scorpii (Zet02 Sco) is the Bayer Classification for the star. The Id of the star in the Yale Bright Star Catalogue is HR6271. HIP82729 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD152334.

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

Location of Zeta2 Scorpii

The location of the 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 star is compared to the celestial equator and is expressed in degrees. For Zeta2 Scorpii, the location is 16h 54m 35.11 and -42° 21` 38.7 .

Radial Velocity and Proper Motion of Zeta2 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 -229.44 ± 0.19 miliarcseconds/year towards the north and -127.72 ± 0.27 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 the Sun is -18.70 km/s with an error of about 0.70 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.

Zeta2 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 114.98 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 Zeta2 Scorpii

Zeta2 Scorpii has a spectral type of K4III. This means the star is a orange to red giant star. The star is 7,361.00 Parsecs from the Galactic Centre or in terms of Light Years is 24,008.88 s. The star has a B-V Colour Index of 1.39 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,176 Kelvin.

Zeta2 Scorpii Radius has been calculated as being 15.54 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 10,810,951.15.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 13.66. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures. The star's Iron Abundance is 0.02 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

Zeta2 Scorpii Apparent and Absolute Magnitudes

Zeta2 Scorpii has an apparent magnitude of 3.62 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 0.30 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.58. 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 Zeta2 Scorpii

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 21.67 which gave the calculated distance to Zeta2 Scorpii as 150.51 light years away from Earth or 46.15 parsecs. It would take a spaceship travelling at the speed of light, 150.51 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 24.65 which put Zeta2 Scorpii at a distance of 132.32 light years or 40.57 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 8,368,104.88 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 7,361.00 Parsecs or 24,008.88 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

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 Zeta2 Scorpii Facts and Figures

Visual Facts

Primary / Proper / Traditional NameZeta2 Scorpii
Alternative NamesZet02 Sco, HD 152334, HIP 82729, HR 6271
Spectral TypeK4III
Constellation's Main StarNo
Multiple Star SystemYes
Star TypeGiant Star
Colour orange to red
GalaxyMilky Way
Absolute Magnitude 0.30 / 0.58
Visual / Apparent Magnitude3.62
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)16h 54m 35.11
Declination (Dec.)-42° 21` 38.7
Galactic Latitude0.79 degrees
Galactic Longitude343.10 degrees
1997 Distance from Earth21.67 Parallax (milliarcseconds)
 150.51 Light Years
 46.15 Parsecs
2007 Distance from Earth24.65 Parallax (milliarcseconds)
 132.32 Light Years
 40.57 Parsecs
 8,368,104.88 Astronomical Units
Galacto-Centric Distance24,008.88 Light Years / 7,361.00 Parsecs
Proper Motion Dec.-229.44 ± 0.19 milliarcseconds/year
Proper Motion RA.-127.72 ± 0.27 milliarcseconds/year
B-V Index1.39
Radial Velocity-18.70 ± 0.70 km/s
Iron Abundance0.02 ± 9.99 Fe/H
Semi-Major Axis5760.00
Stellar Luminosity (Lsun)114.98
Associated / Clustered StarsZeta1 Scorpii

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Estimated Facts

Calculated Effective Temperature4,176 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

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