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BI Cygni

BI Cygni Facts

  • BI Cygni is a supergiant star that can be located in the constellation of Cygnus. The description is based on the spectral class.
  • BI Cygni is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (M4Iab) of the star, the star's colour is red .
  • The star is calculated at being about 4487.05 light years away from us. Distance

Location of BI Cygni

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 BI Cygni, the location is 20 21 21.8871531507 and +36 55 55.725144903 .

Radial Velocity and Proper Motion of BI Cygni

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 -5.22 milliarcseconds/year towards the north and -2.93 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 -6.82000 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 BI Cygni

BI Cygni Temperature and Colour

Based on the star's spectral type of M4Iab , BI Cygni's colour and type is red supergiant star. Based on the star's spectral, the stars temperature is between 2,400.00 and 3,700.00 degrees kelvin.

Distance to BI Cygni

The Parallax of the star is given as 0.72690 which gives a calculated distance to BI Cygni of 4487.05 light years from the Earth or 1375.71 parsecs. It is about 26,377,685,980,743,517 miles from Earth.

The star is roughly 283,758,579.34 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 BI Cygni

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)
Walking4752,272,586,288.61
Car12025,075,752,876.29
Airbus A3807364,088,437,968.96
Speed of Sound (Mach 1)767.2693,921,819,264.37
Concorde (Mach 2)1,534.541,960,907,076.49
New Horizons Probe33,00091,184,555.91
Speed of Light670,616,629.004,487.05

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Additional BI Cygni Facts and Figures

Visual Facts


Primary / Proper / Traditional NameBI Cygni
Spectral TypeM4Iab
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star Type very luminous Supergiant Star
ColourRed
GalaxyMilky Way
ConstellationCygnus
Right Ascension (R.A.)20 21 21.8871531507
Declination (Dec.)+36 55 55.725144903
Distance from Earth0.72690 Parallax (milliarcseconds)
 4487.05 Light Years
 1375.71 Parsecs
 283,758,579.34 Astronomical Units
Proper Motion Dec.-5.22300 milliarcseconds/year
Proper Motion RA.-2.92900 milliarcseconds/year
Radial Velocity-6.82000 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Calculated Facts


Calculated Temperature Range2,400.00 - 3,700.00

Sources and Links


Sourcehttp://simbad.u-strasbg.fr/simbad/sim-id?Ident=BI+Cygni

Location of BI Cygni in Cygnus


BI Cygni Location in Cygnus

The map was generated using Night Vision, an awesome free application by Brian Simpson.

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