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BQ Oct, HD110994, HIP71348

BQ Oct is a red pulsating giant star that can be located in the constellation of Octans. The star can not be seen by the naked eye, you need a telescope to see it.

BQ Oct's Alternative Names

HIP71348 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD110994.

BQ Oct has alternative name(s) :- , BQ Oct.

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

Location of BQ Oct

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 BQ Oct, the location is 14h 35m 30.80 and -89° 46` 18.1 .

Proper Motion of BQ Oct

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 -8.84 ± 0.34 miliarcseconds/year towards the north and -8.78 ± 0.40 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 -3.50000 km/s with an error of about 3.00 km/s .

Physical Properties (Colour, Temperature) of BQ Oct

BQ Oct has a spectral type of M4III. This means the star is a red giant star. The star is 7184.00000000 Parsecs from the Galactic Centre or terms of Light Years is 23431.5746329600000000s. The star has a B-V Colour Index of 1.69 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 3,502 Kelvin.

BQ Oct Radius has been calculated as being 52.76 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 36,708,881.89.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 53.49. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

BQ Oct Apparent and Absolute Magnitudes

BQ Oct has an apparent magnitude of 6.82 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 -1.59 If you used the 2007 Parallax value, you would get an absolute magnitude of -1.62. 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 BQ Oct

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 2.08 which gave the calculated distance to BQ Oct as 1568.09 light years away from Earth or 480.77 parsecs. It would take a spaceship travelling at the speed of light, 1568.09 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 2.05 which put BQ Oct at a distance of 1591.04 light years or 487.80 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 7,184.00 Parsecs or 23,431.57 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 BQ Oct

The star is a pulsating Slow Irregular 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. BQ Oct brightness ranges from a magnitude of 6.884 to a magnitude of 6.686 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.

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BQ Oct Facts

Visual Facts

Alternative NamesHD 110994, HIP 71348, BQ Oct
Star TypeGiant Star
GalaxyMilky Way
Absolute Magnitude-1.59 / -1.62
Visual / Apparent Magnitude6.82
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)14h 35m 30.80
Declination (Dec.)-89° 46` 18.1
Galactic Latitude-26.92 degrees
Galactic Longitude303.04 degrees
1997 Distance from Earth2.08 Parallax (milliarcseconds)
 1568.09 Light Years
 480.77 Parsecs
2007 Revised Distance from Earth2.05 Parallax (milliarcseconds)
 1591.04 Light Years
 487.80 Parsecs
Galacto-Centric Distance23,431.57 Light Years / 7,184.00 Parsecs
Proper Motion Dec.-8.84 ± 0.34 milliarcseconds/year
Proper Motion RA.-8.78 ± 0.40 milliarcseconds/year
B-V Index1.69
Radial Velocity-3.50 ± 3.00 km/s
Semi-Major Axis7450.00
Spectral TypeM4III
Colour(M) Red

Variable Star Details

Variable Star ClassPulsating
Variable Star TypeSlow Irregular
Mean Variability Period in Days0.166
Variable Magnitude Range (Brighter - Dimmer)6.686 - 6.884

Estimated Facts

Calculated Effective Temperature3,502 Kelvin

Sources and Links

SIMBAD SourceLink

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