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BP Bootis, HD140728, HIP76957

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

HIP76957 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD140728.

Location of BP Bootis

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 BP Bootis, the location is 15h 42m 50.82 and +52d 21` 39.0 .

Proper Motion of BP Bootis

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 30.10 ± 0.16 miliarcseconds/year towards the north and -65.91 ± 0.18 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 -16.10000 km/s with an error of about 2.80 km/s .

Physical Properties (Colour, Temperature, Radius) of BP Bootis

BP Bootis has a spectral type of B9p.... This means the star is a blue star. The star is 7394.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24116.5176553600000000s. The star has a B-V Colour Index of -0.04 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 11,437 Kelvin.

BP Bootis Radius has been calculated as being 1.85 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,290,500.83.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 1.75. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

BP Bootis Apparent and Absolute Magnitudes

BP Bootis has an apparent magnitude of 5.48 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 0.54 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.67. 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 BP Bootis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 10.30 which gave the calculated distance to BP Bootis as 316.66 light years away from Earth or 97.09 parsecs. It would take a spaceship travelling at the speed of light, 316.66 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 10.92 which put BP Bootis at a distance of 298.68 light years or 91.58 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 7,394.00 Parsecs or 24,116.52 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.

BP Bootis Facts

Alternative Names

Traditional/Proper NameBP Bootis
Hipparcos Library I.D.76957
Bonner DurchmusterungBD+52 1898
Henry Draper Designation140728

Visual Facts

Star Type star
Absolute Magnitude0.54 / 0.67
Visual / Apparent Magnitude5.48
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)15h 42m 50.82
Declination (Dec.)+52d 21` 39.0
Galactic Latitude49.42 degrees
Galactic Longitude83.25 degrees
1997 Distance from Earth10.30 Parallax (milliarcseconds)
 316.66 Light Years
 97.09 Parsecs
2007 Revised Distance from Earth10.92 Parallax (milliarcseconds)
 298.68 Light Years
 91.58 Parsecs
Galacto-Centric Distance24,116.52 Light Years / 7,394.00 Parsecs
Proper Motion Dec.30.10 ± 0.16 milliarcseconds/year
Proper Motion RA.-65.91 ± 0.18 milliarcseconds/year
B-V Index-0.04
Radial Velocity-16.10 ± 2.80 km/s
Spectral TypeB9p...
Colour(B) blue

Estimated Facts

Calculated Effective Temperature11,437 Kelvin

Sources and Links

SIMBAD SourceLink

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