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RT Cygni, HD186686, HIP97068

RT Cygni is a red pulsating 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.

RT Cygni's Alternative Names

HIP97068 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD186686.

RT Cygni has alternative name(s) :- , RT Cyg.

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+48 2942.

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

Location of RT Cygni

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 RT Cygni, the location is 19h 43m 37.78 and +48° 46` 41.2 .

Physical Properties (Colour, Temperature) of RT Cygni

RT Cygni has a spectral type of M2e-M8.8Ibe. This means the star is a red supergiant star. The star has a B-V Colour Index of 1.27 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,440 Kelvin.

RT Cygni Apparent and Absolute Magnitudes

RT Cygni has an apparent magnitude of 8.44 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. Using the supplied Parallax value, you would get an absolute magnitude of 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 RT Cygni

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as -0.87 which gave the calculated distance to RT Cygni as -3749.00 light years away from Earth or -1149.43 parsecs. It would take a spaceship travelling at the speed of light, -3749.00 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

Variable Type of RT Cygni

The star is a pulsating Omicron Ceti 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. RT Cygni brightness ranges from a magnitude of 11.036 to a magnitude of 7.355 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 189.7 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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RT Cygni Facts

Visual Facts


Primary / Proper / Traditional NameRT Cygni
Alternative NamesHD 186686, HIP 97068, BD+48 2942, RT Cyg
Spectral TypeM2e-M8.8Ibe
Multiple Star SystemNo / Unknown
Star Type very luminous Supergiant Star
Colour red
GalaxyMilky Way
ConstellationCygnus
Visual / Apparent Magnitude8.44
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)19h 43m 37.78
Declination (Dec.)+48° 46` 41.2
Galactic Latitude12.16 degrees
Galactic Longitude81.88 degrees
Distance from Earth-0.87 Parallax (milliarcseconds)
 -3749.00 Light Years
 -1149.43 Parsecs
B-V Index1.27
Radial Velocity-116.00 ± 4.50 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeOmicron Ceti
Mean Variability Period in Days189.700
Variable Magnitude Range (Brighter - Dimmer)7.355 - 11.036

Estimated Facts


Calculated Effective Temperature4,440 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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