Universe Guide

HD 105056

HD 105056 Facts

  • HD 105056 is a pulsating supergiant star that can be located in the constellation of Musca. The description is based on the spectral class.
  • HD 105056 is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (B0Iab:pe) of the star, the star's colour is blue .
  • 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 15531.59 light years away from us. Distance

HD 105056's Alternative Names

HIP58998 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD105056.

HD 105056 has alternative name(s) :- , GS Mus.

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

Location of HD 105056

The location of the supergiant 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 HD 105056, the location is 12h 05m 49.89 and -69° 34` 23.0 .

Radial Velocity and Proper Motion of HD 105056

Proper Motion

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 -1.28 ± 0.39 milliarcseconds/year towards the north and -4.34 ± 0.49 milliarcseconds/year east if we saw them in the horizon.

Radial Velocity

The Radial Velocity, that is the speed at which the star is moving away/towards the Sun is -9.00000 km/s with an error of about 3.10 km/s . 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 HD 105056

HD 105056 Colour and Temperature

Based on the star's spectral type of B0Iab:pe , HD 105056's colour and type is blue supergiant star. The star has a B-V Colour Index of 0.01 which means the star's temperature is about 10,051 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

HD 105056 Radius

HD 105056 estimated radius has been calculated as being 5.92 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 4,120,816.02.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 49.039254932889900535399845302. 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.

HD 105056 Apparent and Absolute Magnitudes

HD 105056 has an apparent magnitude of 7.38 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 -1.42 If you used the 2007 Parallax value, you would get an absolute magnitude of -6.01. 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 HD 105056

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 1.74000 which gave the calculated distance to HD 105056 as 1874.50 light years away from Earth or 574.71 parsecs. If you want that in miles, it is about 11,019,483,262,032,676.95, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 0.21000 which put HD 105056 at a distance of 15531.59 light years or 4761.90 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 982,205,536.76 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 HD 105056

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 A38073614,151,824,088.06
Speed of Sound (Mach 1)767.26913,575,085,828.84
Concorde (Mach 2)1,534.546,787,534,068.07
New Horizons Probe33,000315,628,561.48
Speed of Light670,616,629.0015,531.59

Variable Type of HD 105056

The star is a pulsating Alpha Cygnus 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. HD 105056 brightness ranges from a magnitude of 7.435 to a magnitude of 7.349 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 HD 105056 Facts and Figures

Visual Facts

Primary / Proper / Traditional NameHD 105056
Alternative NamesHD 105056, HIP 58998, GS Mus
Spectral TypeB0Iab:pe
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star Type very luminous Supergiant Star
GalaxyMilky Way
Absolute Magnitude -1.42 / -6.01
Visual / Apparent Magnitude7.38
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)12h 05m 49.89
Declination (Dec.)-69° 34` 23.0
Galactic Latitude-7.05506038 degrees
Galactic Longitude298.94544448 degrees
1997 Distance from Earth1.74000 Parallax (milliarcseconds)
 1874.50 Light Years
 574.71 Parsecs
2007 Distance from Earth0.21000 Parallax (milliarcseconds)
 15531.59 Light Years
 4761.90 Parsecs
 982,205,536.76 Astronomical Units
Proper Motion Dec.-1.28000 ± 0.39000 milliarcseconds/year
Proper Motion RA.-4.34000 ± 0.49000 milliarcseconds/year
B-V Index0.01
Radial Velocity-9.00000 ± 3.10 km/s

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Variable Star Details

Variable Star ClassPulsating
Variable Star TypeAlpha Cygnus
Mean Variability Period in Days0.067
Variable Magnitude Range (Brighter - Dimmer)7.349 - 7.435

Estimated Calculated Facts

Radius (x the Sun)49.04
Effective Temperature10,051 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

Comments and Questions

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