Universe Guide

BP Circini

BP Circini Facts

  • BP Circini is a pulsating luminous giant star that can be located in the constellation of Circinus. The description is based on the spectral class.
  • BP Circini is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (F2/F3II) of the star, the star's colour is yellow to white .
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • The star is calculated at being about 25089.49 light years away from us. Distance

BP Circini's Alternative Names

HIP72264 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD129708.

BP Circini has alternative name(s) :- BP Cir, BP Cir.

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

Location of BP Circini

The location of the luminous 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 BP Circini, the location is 14h 46m 41.99 and -61° 27` 43.0 .

Physical Properties of BP Circini

BP Circini Colour and Temperature

Based on the star's spectral type of F2/F3II , BP Circini's colour and type is yellow to white luminous giant star. The star has a B-V Colour Index of 0.64 which means the star's temperature is about 5,784 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

BP Circini Radius

BP Circini estimated radius has been calculated as being 224.14 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 155,954,927.38.km. If you need the diameter of the star, you just need to multiple the radius by 2. 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.

BP Circini Apparent and Absolute Magnitudes

BP Circini has an apparent magnitude of 7.52 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. Using the supplied Parallax value, you would get an absolute magnitude of -6.91 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 BP Circini

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 0.13000 which gave the calculated distance to BP Circini as 25089.49 light years away from Earth or 7692.31 parsecs. If you want that in miles, it is about 147,491,712,514,236,451.26, based on 1 Ly = 5,878,625,373,183.61 miles.

Travel Time to BP Circini

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 A38073622,860,637,509.69
Speed of Sound (Mach 1)767.26921,928,983,455.78
Concorde (Mach 2)1,534.5410,964,477,437.62
New Horizons Probe33,000509,861,491.13
Speed of Light670,616,629.0025,089.49

Variable Type of BP Circini

The star is a pulsating Cepheids 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. BP Circini brightness ranges from a magnitude of 7.840 to a magnitude of 7.504 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 2.4 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 BP Circini Facts and Figures

Visual Facts

Primary / Proper / Traditional NameBP Circini
Alternative NamesBP Cir, HD 129708, HIP 72264, BP Cir
Spectral TypeF2/F3II
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeLuminous Giant Star
ColourYellow - White
GalaxyMilky Way
Absolute Magnitude -6.91
Visual / Apparent Magnitude7.52
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)14h 46m 41.99
Declination (Dec.)-61° 27` 43.0
Galactic Latitude-1.60703583 degrees
Galactic Longitude316.25005918 degrees
Distance from Earth0.13000 Parallax (milliarcseconds)
 25089.49 Light Years
 7692.31 Parsecs
 1,586,641,775.87 Astronomical Units
B-V Index0.64
Radial Velocity-15.50000 ± 2.50 km/s

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Variable Star Details

Variable Star ClassPulsating
Variable Star TypeCepheids
Mean Variability Period in Days2.398
Variable Magnitude Range (Brighter - Dimmer)7.504 - 7.840

Estimated Calculated Facts

Radius (x the Sun)224.14
Effective Temperature5,784 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

Comments and Questions

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