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HDE 226868

HDE 226868 is a blue supergiant star that can be located in the constellation of Cygnus. The description is based on the spectral class. The star can not be seen by the naked eye, you need a telescope to see it.

Location of HDE 226868

The location of the 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 star is compared to the celestial equator and is expressed in degrees. For HDE 226868, the location is 19h 58m 21 and 35° 12` 05.77 .

Physical Properties (Colour, Radius) of HDE 226868

HDE 226868 has a spectral type of O9.7Iab. This means the star is a blue supergiant star. HDE 226868 lies at a distance of 6,100.00 light years away from our Sun and our planet Earth or to put it another way, 1,870.23 parsecs away from the Sun.

HDE 226868 has been calculated as 20.00 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 13,916,000.00.km. If you need the diameter of the star, you just need to multiple the radius by 2.

HDE 226868 Apparent and Absolute Magnitudes

HDE 226868 has an apparent magnitude of 8.95 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. 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 HDE 226868

HDE 226868 is an estimated 6,100.00 light years from our Solar System (Earth and Sun). It would take a spaceship 6,100.00 years travelling at the speed of light to get there. We don't have a space ship that can travel that distance or at that speed yet.

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HDE 226868 Facts

Visual Facts


Primary / Proper / Traditional NameHDE 226868
Spectral TypeO9.7Iab
Multiple Star SystemNo / Unknown
Star Type very luminous Supergiant Star
Colour blue
GalaxyMilky Way
ConstellationCygnus
Visual / Apparent Magnitude8.95
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)19h 58m 21
Declination (Dec.)35° 12` 05.77
Distance from the Sun / Earth6,100.00 Light Years

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Facts


Radius (x the Sun)20.00

Sources and Links


Sourcehttps://en.wikipedia.org/wiki/Cygnus_X-1

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