Universe Guide

R Cygni (S Star) Facts

R Cygni Facts

R Cygni's Alternative Names

The Id of the star in the Henry Draper catalogue is HD185456.

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+49 3064.

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

Location of R Cygni

The location of the S-Type 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 R Cygni, the location is 19 36 49.3563270715 and +50 11 59.719752717 .

Radial Velocity and Proper Motion of R 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 -5.76 milliarcseconds/year towards the north and -3.16 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 -25.00 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 (Radius) of R Cygni

R Cygni Colour and Temperature

R Cygni has a spectral type of S4-8/6e B.

R Cygni Radius

R Cygni has been calculated as 745.00 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 518,371,000.00.km. If you need the diameter of the star, you just need to multiple the radius by 2.

Distance to R Cygni

The Parallax of the star is given as 1.48 which gives a calculated distance to R Cygni of 2198.61 light years from the Earth or 674.08 parsecs. It would take a spaceship travelling at the speed of light, 2198.61 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

The star is roughly 139,038,011.76 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.

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Additional R Cygni Facts and Figures

Visual Facts

Primary / Proper / Traditional NameR Cygni
Alternative NamesHD 185456, BD+49 3064
Spectral TypeS4-8/6e B
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeS-Type Star
GalaxyMilky Way
Right Ascension (R.A.)19 36 49.3563270715
Declination (Dec.)+50 11 59.719752717
Distance from Earth1.48 Parallax (milliarcseconds)
 2198.61 Light Years
 674.08 Parsecs
 139,038,011.76 Astronomical Units
Proper Motion Dec.-5.76 milliarcseconds/year
Proper Motion RA.-3.16 milliarcseconds/year
Radial Velocity-25.00 km/s

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Estimated Calculated Facts

Radius (x the Sun)745.00

Sources and Links


Location of R Cygni in Cygnus

R Cygni Location in Cygnus

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

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