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AI Cygni

AI Cygni Facts

  • AI Cygni is a pulsating variable star that can be located in the constellation of Cygnus. The description is based on the spectral class.
  • AI Cygni is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (M6.5) of the star, the star's colour is red .
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • The star is calculated at being about 4181.58 light years away from us. Distance

AI Cygni's Alternative Names

HIP101282 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD195691.

AI Cygni has alternative name(s) :- , AI 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+32 3852.

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

Location of AI Cygni

The location of the variable 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 AI Cygni, the location is 20h 31m 45.22 and +32° 31` 21.2 .

Physical Properties of AI Cygni

AI Cygni Colour and Temperature

Based on the star's spectral type of M6.5 , AI Cygni's colour and type is red variable star. The star has a B-V Colour Index of 1.48 which means the star's temperature is about 4,056 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

AI Cygni Radius

AI Cygni estimated radius has been calculated as being 45.16 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 31,420,311.96.km. If you need the diameter of the star, you just need to multiple the radius by 2. The figure is derived at by using the formula from SDSS rather than peer reviewed papers. It has been known to produce widely incorrect figures.

AI Cygni Apparent and Absolute Magnitudes

AI Cygni has an apparent magnitude of 8.65 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 -1.89 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 AI Cygni

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 0.78000 which gave the calculated distance to AI Cygni as 4181.58 light years away from Earth or 1282.05 parsecs. If you want that in miles, it is about 24,581,942,287,997,119.90, based on 1 Ly = 5,878,625,373,183.61 miles.

Travel Time to AI 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)
Walking4 701,059,270,873.46
Car12023,368,642,362.45
Airbus A3807363,810,104,733.01
Speed of Sound (Mach 1)767.2693,654,829,119.24
Concorde (Mach 2)1,534.541,827,412,177.91
New Horizons Probe33,00084,976,881.32
Speed of Light670,616,629.004,181.58

Variable Type of AI Cygni

The star is a pulsating Semiregular late- (M 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. AI Cygni brightness ranges from a magnitude of 8.700 to a magnitude of 7.830 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.8 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 AI Cygni Facts and Figures

Visual Facts


Primary / Proper / Traditional NameAI Cygni
Alternative NamesHD 195691, HIP 101282, BD+32 3852, AI Cyg
Spectral TypeM6.5
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
ColourRed
GalaxyMilky Way
ConstellationCygnus
Absolute Magnitude -1.89
Visual / Apparent Magnitude8.65
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)20h 31m 45.22
Declination (Dec.)+32° 31` 21.2
Galactic Latitude-4.18210974 degrees
Galactic Longitude72.96014391 degrees
Distance from Earth0.78000 Parallax (milliarcseconds)
 4181.58 Light Years
 1282.05 Parsecs
 264,439,952.21 Astronomical Units
B-V Index1.48
Radial Velocity-58.00000 ± 4.60 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeSemiregular late- (M
Mean Variability Period in Days0.769
Variable Magnitude Range (Brighter - Dimmer)7.830 - 8.700

Estimated Calculated Facts


Radius (x the Sun)45.16
Effective Temperature4,056 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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