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BI Phoenicis

BI Phoenicis Facts

BI Phoenicis's Alternative Names

HIP500 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD119.

BI Phoenicis has alternative name(s) :- , BI Phe.

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

Location of BI Phoenicis

The location of the variable 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 BI Phoenicis, the location is 00h 06m 00.03 and -48° 40` 43.4 .

Proper Motion of BI Phoenicis

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 -11.78 ± 0.95 milliarcseconds/year towards the north and 17.38 ± 1.47 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 (Colour, Temperature) of BI Phoenicis

BI Phoenicis Colour and Temperature

BI Phoenicis has a spectral type of M1/M2. This means the star is a red variable star. The star has a B-V Colour Index of 1.8 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 3,025 Kelvin.

BI Phoenicis Radius

Radius has been calculated as being 26.88 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 18,703,895.41.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 34.31. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

BI Phoenicis Apparent and Absolute Magnitudes

BI Phoenicis has an apparent magnitude of 9.57 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 0.51 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.02. 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 BI Phoenicis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 1.54 which gave the calculated distance to BI Phoenicis as 2117.94 light years away from Earth or 649.35 parsecs. It would take a spaceship travelling at the speed of light, 2117.94 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 1.21 which put BI Phoenicis at a distance of 2695.56 light years or 826.45 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 170,466,361.30 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.

Variable Type of BI Phoenicis

The star is a pulsating Semi-Regular Star w 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. BI Phoenicis brightness ranges from a magnitude of 9.838 to a magnitude of 9.558 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.3 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 BI Phoenicis Facts and Figures

Visual Facts

Primary / Proper / Traditional NameBI Phoenicis
Alternative NamesHD 119, HIP 500, BI Phe
Spectral TypeM1/M2
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
GalaxyMilky Way
Absolute Magnitude 0.51 / -0.02
Visual / Apparent Magnitude9.57
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)00h 06m 00.03
Declination (Dec.)-48° 40` 43.4
Galactic Latitude-66.72 degrees
Galactic Longitude322.14 degrees
1997 Distance from Earth1.54 Parallax (milliarcseconds)
 2117.94 Light Years
 649.35 Parsecs
2007 Distance from Earth1.21 Parallax (milliarcseconds)
 2695.56 Light Years
 826.45 Parsecs
 170,466,361.30 Astronomical Units
Proper Motion Dec.-11.78 ± 0.95 milliarcseconds/year
Proper Motion RA.17.38 ± 1.47 milliarcseconds/year
B-V Index1.80

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Variable Star Details

Variable Star ClassPulsating
Variable Star TypeSemi-Regular Star w
Mean Variability Period in Days0.259
Variable Magnitude Range (Brighter - Dimmer)9.558 - 9.838

Estimated Calculated Facts

Radius (x the Sun)34.31
Effective Temperature3,025 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

Comments and Questions

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