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BM Scorpii, HD160371, HIP86527

BM Scorpii is a orange to red pulsating 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.

HIP86527 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD160371.

BM Scorpii has alternative name(s), BM Sco.

Location of BM 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 BM Scorpii, the location is 17h 40m 58.55 and -32d 12` 52.0 .

Proper Motion of BM 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 -6.51 ± 0.23 miliarcseconds/year towards the north and -2.01 ± 0.36 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 -7.99000 km/s with an error of about 0.20 km/s .

BM 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 58.0000000 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 BM Scorpii

BM Scorpii has a spectral type of K3III + (G). This means the star is a orange to red star. The star is 7082.00000000 Parsecs from the Galactic Centre or terms of Light Years is 23098.8880220800000000s. The star has a B-V Colour Index of 1.67 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 3,575 Kelvin.

BM Scorpii Radius has been calculated as being 71.84 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 49,987,199.82.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 37.01. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

BM Scorpii Apparent and Absolute Magnitudes

BM Scorpii has an apparent magnitude of 6.01 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 -2.35 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.91. 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 BM Scorpii

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 2.13 which gave the calculated distance to BM Scorpii as 1531.28 light years away from Earth or 469.48 parsecs. It would take a spaceship travelling at the speed of light, 1531.28 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 4.14 which put BM Scorpii at a distance of 787.83 light years or 241.55 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 7,082.00 Parsecs or 23,098.89 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 BM Scorpii

The star is a pulsating Semiregular giants and supergiants of F, G, or K spectral s, sometimes with emission lines in their spectral 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. BM Scorpii brightness ranges from a magnitude of 6.212 to a magnitude of 6.067 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.2 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.

BM Scorpii Facts

Alternative Names

Traditional/Proper NameBM Scorpii
Short NameBM Sco
Hipparcos Library I.D.86527
Henry Draper Designation160371

Visual Facts

Star Type star
Absolute Magnitude-2.35 / -0.91
Visual / Apparent Magnitude6.01
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)17h 40m 58.55
Declination (Dec.)-32d 12` 52.0
Galactic Latitude-0.87 degrees
Galactic Longitude356.69 degrees
1997 Distance from Earth2.13 Parallax (milliarcseconds)
 1531.28 Light Years
 469.48 Parsecs
2007 Revised Distance from Earth4.14 Parallax (milliarcseconds)
 787.83 Light Years
 241.55 Parsecs
Galacto-Centric Distance23,098.89 Light Years / 7,082.00 Parsecs
Proper Motion Dec.-6.51 ± 0.23 milliarcseconds/year
Proper Motion RA.-2.01 ± 0.36 milliarcseconds/year
B-V Index1.67
Radial Velocity-7.99 ± 0.20 km/s
Spectral TypeK3III + (G)
Colour(K) Orange to Red

Variable Star Details

Variable Star ClassPulsating
Variable Star TypeSemiregular giants and supergiants of F, G, or K spectral s, sometimes with emission lines in their spectral
Mean Variability Period in Days0.212
Variable Magnitude Range (Brighter - Dimmer)6.067 - 6.212

Estimated Facts

Luminosity (x the Sun)58.0000000
Calculated Effective Temperature3,575 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

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