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AY Cygni

AY Cygni Facts

  • AY Cygni is a pulsating variable star that can be located in the constellation of Cygnus. The description is based on the spectral class.
  • AY Cygni is not part of the constellation outline but is within the borders of the constellation.
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 7248.07 light years away from us. Distance

AY Cygni's Alternative Names

HIP99336 is the reference name for the star in the Hipparcos Star Catalogue.

AY Cygni has alternative name(s) :- AY Cyg, AY 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+41 3632.

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

Location of AY 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 AY Cygni, the location is 20h 09m 44.23 and +41° 29` 36.5 .

Radial Velocity and Proper Motion of AY 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 -4.47 ± 1.01 milliarcseconds/year towards the north and 1.51 ± 1.21 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 16.00000 km/s with an error of about 5.50 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 AY Cygni

AY Cygni Temperature and Colour

Based on the star's spectral type of N0v The star has a B-V Colour Index of 1.6 which means the star's temperature is about 3,775 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

AY Cygni Radius

AY Cygni Apparent and Absolute Magnitudes

AY Cygni has an apparent magnitude of 9.93 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. If you used the 1997 Parallax value, you would get an absolute magnitude of If you used the 2007 Parallax value, you would get an absolute magnitude of -1.80. 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 AY Cygni

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as -1.79000 which gave the calculated distance to AY Cygni as -1822.14 light years away from Earth or -558.66 parsecs. If you want that in miles, it is about -10,711,678,437,492,783.13, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 0.45000 which put AY Cygni at a distance of 7248.07 light years or 2222.22 parsecs. It should not be taken as though the star is moving closer or further away from us. It is purely that the distance was recalculated.

Using the 2007 distance, the star is roughly 458,362,583.82 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 AY 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)
Walking41,215,169,067,539.01
Car12040,505,635,584.63
Airbus A3807366,604,179,714.89
Speed of Sound (Mach 1)767.2696,335,035,391.96
Concorde (Mach 2)1,534.543,167,513,567.69
New Horizons Probe33,000147,293,220.31
Speed of Light670,616,629.007,248.07

Variable Type of AY Cygni

The star is a pulsating Slow Irregular 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. AY Cygni brightness ranges from a magnitude of 10.220 to a magnitude of 9.790 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.3 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 AY Cygni Facts and Figures

Visual Facts


Primary / Proper / Traditional NameAY Cygni
Alternative NamesAY Cyg, HIP 99336, BD+41 3632, AY Cyg
Spectral TypeN0v
Constellation's Main StarNo
Multiple Star SystemYes
Star TypeVariable Star
GalaxyMilky Way
ConstellationCygnus
Absolute Magnitude / -1.80
Visual / Apparent Magnitude9.93
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)20h 09m 44.23
Declination (Dec.)+41° 29` 36.5
Galactic Latitude4.51727114 degrees
Galactic Longitude77.86436500 degrees
1997 Distance from Earth-1.79000 Parallax (milliarcseconds)
 -1822.14 Light Years
 -558.66 Parsecs
2007 Distance from Earth0.45000 Parallax (milliarcseconds)
 7248.07 Light Years
 2222.22 Parsecs
 458,362,583.82 Astronomical Units
Proper Motion Dec.-4.47000 ± 1.01000 milliarcseconds/year
Proper Motion RA.1.51000 ± 1.21000 milliarcseconds/year
B-V Index1.6
Radial Velocity16.00000 ± 5.50 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeSlow Irregular
Mean Variability Period in Days0.321
Variable Magnitude Range (Brighter - Dimmer)9.790 - 10.220

Estimated Calculated Facts


Effective Temperature3,775 Kelvin

Sources and Links


SIMBAD SourceLink

Multi-Star System

The star has been identified as being a multi-star system, one in which there is at least one star in close orbit to another star or two or more stars orbiting a central point. The stars may be of equal mass, unequal mass where one star is stronger than the other or be in groups orbiting a central point which doesn't necessarily have to be a star. More information can be found on my dedicated multiple star systems page. The source of the info is Simbad. The file is dated 2000 so any differences between this and any other source will be down to the actual source from where the information came from.


Proper Motion mas/yr
H.D. IdB.D. IdStar CodeMagnitudeR.A.Dec.SpectrumColourYear
+41 3632.0A10.500003.00000-5.00000NV
B11.100003.00000-5.000001991

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