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HIP 12972, HD17088

HIP 12972 Facts

HIP 12972's Alternative Names

HIP12972 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD17088.

BD number is the number that the star was filed under in the Durchmusterung or Bonner Durchmusterung, a star catalogue that was put together by the Bonn Observatory between 1859 to 1903. The star's BD Number is BD+57 632.

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

Location of HIP 12972

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 HIP 12972, the location is 02h 46m 51.45 and +57° 44` 01.7 .

Radial Velocity and Proper Motion of HIP 12972

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 -0.32 ± 0.45 milliarcseconds/year towards the north and -0.23 ± 1.00 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 -40.50 km/s with an error of about 1.78 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 (Colour, Temperature) of HIP 12972

HIP 12972 Colour and Temperature

HIP 12972 has a spectral type of B9Ia. This means the star is a blue supergiant star. The star has a B-V Colour Index of 0.7 which means the star's temperature is about 5,648 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu at being .

HIP 12972 Radius

Radius has been calculated as being 27.61 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 19,214,126.33.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 2987.01. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

HIP 12972 Apparent and Absolute Magnitudes

HIP 12972 has an apparent magnitude of 7.57 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 -2.26 If you used the 2007 Parallax value, you would get an absolute magnitude of -12.43. 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 HIP 12972

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 1.08 which gave the calculated distance to HIP 12972 as 3020.03 light years away from Earth or 925.93 parsecs. If you want that in miles, it is 2,025,282,338,079.

In 2007, Hipparcos data was revised with a new parallax of 0.01 which put HIP 12972 at a distance of 326163.34 light years or 100000 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 20,626,336,898.40 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 HIP 12972

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)
Walking454,682,639,893,545.22
Car1201,822,754,663,118.17
Airbus A380736297,188,260,291.01
Speed of Sound (Mach 1)767.269285,076,758,704.16
Concorde (Mach 2)1,534.54142,538,193,578.65
New Horizons Probe33,0006,628,198,774.98
Speed of Light670,616,629.00326,163.34
HIP 12972 brightness ranges from a magnitude of 7.742 to a magnitude of 7.668 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 HIP 12972 Facts and Figures

Visual Facts


Primary / Proper / Traditional NameHIP 12972
Alternative NamesHD 17088, HIP 12972, BD+57 632
Spectral TypeB9Ia
Constellation's Main StarNo
Multiple Star SystemYes
Star Type very luminous Supergiant Star
ColourBlue
GalaxyMilky Way
ConstellationCassiopeia
Absolute Magnitude -2.26 / -12.43
Visual / Apparent Magnitude7.57
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)02h 46m 51.45
Declination (Dec.)+57° 44` 01.7
Galactic Latitude-1.75 degrees
Galactic Longitude137.87 degrees
1997 Distance from Earth1.08 Parallax (milliarcseconds)
 3020.03 Light Years
 925.93 Parsecs
2007 Distance from Earth0.01 Parallax (milliarcseconds)
 326163.34 Light Years
 100000 Parsecs
 20,626,336,898.40 Astronomical Units
Proper Motion Dec.-0.32 ± 0.45 milliarcseconds/year
Proper Motion RA.-0.23 ± 1.00 milliarcseconds/year
B-V Index0.70
Radial Velocity-40.50 ± 1.78 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Mean Variability Period in Days0.053
Variable Magnitude Range (Brighter - Dimmer)7.668 - 7.742

Estimated Calculated Facts


Radius (x the Sun)2,987.01
Effective Temperature5,648 Kelvin

Sources and Links


SIMBAD SourceLink

Multi-Star System

The star has been identified as being a multi-star system, one in which there is at least one star in close orbit to another star or two or more stars orbiting a central point. The stars may be of equal mass, unequal mass where one star is stronger than the other or be in groups orbiting a central point which doesn't necessarily have to be a star. More information can be found on my dedicated multiple star systems page. The source of the info is Simbad. The file is dated 2000 so any differences between this and any other source will be down to the actual source from where the information came from.


Proper Motion mas/yr
H.D. IdB.D. IdStar CodeMagnitudeR.A.Dec.SpectrumColourYear
17088+57 632.0A7.800000.00000-2.00000B9Blue/White
B10.700000.00000-2.000001991

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