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HR 6522, HD158741, HIP85839

Primary Facts on HR 6522

  • HR 6522's star type is pulsating subgiant star that can be located in the constellation of Scorpius. The description is based on the spectral class.
  • HR 6522 is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (F2IV) of the star, the star's colour is blue to white .
  • The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.
  • The star has an estimated age of 0.80 Billion of Years but could be as young as 0.70 to 0.90 according to Hipparcos.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 392.97 light years away from us.

HR 6522's Alternative Names

The Id of the star in the Yale Bright Star Catalogue is HR6522. HIP85839 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD158741.

HR 6522 has alternative name(s) :- , V949 Sco.

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

Location of HR 6522

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 HR 6522, the location is 17h 32m 24.64 and -34° 16` 45.6 .

Radial Velocity and Proper Motion of HR 6522

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 -33.27 ± 0.33 miliarcseconds/year towards the north and -10.37 ± 0.48 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 -43.30 km/s with an error of about 0.40 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.

HR 6522 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 41.23 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, Age) of HR 6522

HR 6522 has a spectral type of F2IV. This means the star is a blue to white subgiant star. The star is 7,281.00 Parsecs from the Galactic Centre or in terms of Light Years is 23,747.95 s. The star has a B-V Colour Index of 0.36 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 6,918 Kelvin.

HR 6522 Radius has been calculated as being 3.99 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 2,775,979.84.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 4.58. 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 0.16 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

The stars age according to Hipparcos data files put the star at an age of about 0.80 Billion years old but could be between 0.70 and 0.90 Billion years old. In comparison, the Sun's age is about 4.6 Billion Years Old.

HR 6522 Apparent and Absolute Magnitudes

HR 6522 has an apparent magnitude of 6.16 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 1.06 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.76. 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 HR 6522

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 9.55 which gave the calculated distance to HR 6522 as 341.53 light years away from Earth or 104.71 parsecs. It would take a spaceship travelling at the speed of light, 341.53 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 8.30 which put HR 6522 at a distance of 392.97 light years or 120.48 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 24,850,610.70 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 7,281.00 Parsecs or 23,747.95 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 HR 6522

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. HR 6522 brightness ranges from a magnitude of 6.263 to a magnitude of 6.218 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 HR 6522 Facts and Figures

Visual Facts


Primary / Proper / Traditional NameHR 6522
Alternative NamesHD 158741, HIP 85839, HR 6522, V949 Sco
Spectral TypeF2IV
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeSubgiant Star
Colour blue to white
GalaxyMilky Way
ConstellationScorpius
Age0.80 Billion Years Old
Age Range0.70 - 0.90 Billion Years Old
Absolute Magnitude 1.06 / 0.76
Visual / Apparent Magnitude6.16
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)17h 32m 24.64
Declination (Dec.)-34° 16` 45.6
Galactic Latitude-0.47 degrees
Galactic Longitude353.98 degrees
1997 Distance from Earth9.55 Parallax (milliarcseconds)
 341.53 Light Years
 104.71 Parsecs
2007 Distance from Earth8.30 Parallax (milliarcseconds)
 392.97 Light Years
 120.48 Parsecs
 24,850,610.70 Astronomical Units
Galacto-Centric Distance23,747.95 Light Years / 7,281.00 Parsecs
Proper Motion Dec. -33.27 ± 0.33 milliarcseconds/year
Proper Motion RA.-10.37 ± 0.48 milliarcseconds/year
B-V Index0.36
Radial Velocity-43.30 ± 0.40 km/s
Iron Abundance0.16 ± 9.99 Fe/H
Eccentricity0.15
Semi-Major Axis7254.00
Stellar Luminosity (Lsun)41.23

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeDelta Scuti
Mean Variability Period in Days0.031
Variable Magnitude Range (Brighter - Dimmer)6.218 - 6.263

Estimated Facts


Calculated Effective Temperature6,918 Kelvin

Sources and Links


SIMBAD SourceLink

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