Universe Guide

BR Capricorni

BR Capricorni Facts

  • BR Capricorni is a giant star that can be located in the constellation of Capricornus. The description is based on the spectral class.
  • BR Capricorni is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (M2III) of the star, the star's colour is red .
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 1782.31 light years away from us. Distance

BR Capricorni's Alternative Names

HIP107530 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD207038.

BR Capricorni has alternative name(s) :- , BR Cap.

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

Location of BR Capricorni

The location of the giant 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 object is compared to the celestial equator and is expressed in degrees. For BR Capricorni, the location is 21h 46m 44.89 and -22° 29` 00.4 .

Proper Motion of BR Capricorni

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 -15.18 ± 0.95 milliarcseconds/year towards the north and 2.20 ± 1.45 milliarcseconds/year east if we saw them in the horizon. . 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.

Physical Properties of BR Capricorni

BR Capricorni Temperature and Colour

Based on the star's spectral type of M2III , BR Capricorni's colour and type is red giant star. The star has a B-V Colour Index of 1.62 which means the star's temperature is about 3,728 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

BR Capricorni Radius

BR Capricorni estimated radius has been calculated as being 34.83 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 24,235,135.25.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 19.586135349422080845267630617. The figure is derived at by using the formula from SDSS rather than peer reviewed papers. It has been known to produce widely incorrect figures.

BR Capricorni Apparent and Absolute Magnitudes

BR Capricorni has an apparent magnitude of 8.98 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 -0.96 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.29. 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 BR Capricorni

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 1.03000 which gave the calculated distance to BR Capricorni as 3166.63 light years away from Earth or 970.87 parsecs. If you want that in miles, it is about 18,615,431,465,484,414.93, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 1.83000 which put BR Capricorni at a distance of 1782.31 light years or 546.45 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 112,712,617.98 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.

Travel Time to BR Capricorni

The time it will take to travel to this star is dependent on how fast you are going. U.G. has done some calculations as to how long it will take going at differing speeds. A note about the calculations, when I'm talking about years, I'm talking non-leap years only (365 days).

The New Horizons space probe is the fastest probe that we've sent into space at the time of writing. Its primary mission was to visit Pluto which at the time of launch (2006), Pluto was still a planet.

DescriptionSpeed (m.p.h.)Time (years)
Airbus A3807361,623,976,527.22
Speed of Sound (Mach 1)767.2691,557,793,582.22
Concorde (Mach 2)1,534.54778,895,775.95
New Horizons Probe33,00036,219,597.70
Speed of Light670,616,629.001,782.31
BR Capricorni brightness ranges from a magnitude of 9.105 to a magnitude of 8.974 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.1 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 BR Capricorni Facts and Figures

Visual Facts

Primary / Proper / Traditional NameBR Capricorni
Alternative NamesHD 207038, HIP 107530, BR Cap
Spectral TypeM2III
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeGiant Star
GalaxyMilky Way
Absolute Magnitude -0.96 / 0.29
Visual / Apparent Magnitude8.98
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)21h 46m 44.89
Declination (Dec.)-22° 29` 00.4
Galactic Latitude-48.05941156 degrees
Galactic Longitude28.76343388 degrees
1997 Distance from Earth1.03000 Parallax (milliarcseconds)
 3166.63 Light Years
 970.87 Parsecs
2007 Distance from Earth1.83000 Parallax (milliarcseconds)
 1782.31 Light Years
 546.45 Parsecs
 112,712,617.98 Astronomical Units
Proper Motion Dec.-15.18000 ± 0.95000 milliarcseconds/year
Proper Motion RA.2.20000 ± 1.45000 milliarcseconds/year
B-V Index1.62

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Variable Star Details

Mean Variability Period in Days0.104
Variable Magnitude Range (Brighter - Dimmer)8.974 - 9.105

Estimated Calculated Facts

Radius (x the Sun)19.59
Effective Temperature3,728 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

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