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V380 Cygni, HD187879, HIP97634, HR7567

V380 Cygni is a blue eclipsing binary system giant star that can be located in the constellation of Cygnus. The description is based on the spectral class. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

V380 Cygni's Alternative Names

The Id of the star in the Yale Bright Star Catalogue is HR7567. HIP97634 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD187879.

V380 Cygni has alternative name(s) :- , V380 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+40 3902.

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

Location of V380 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 V380 Cygni, the location is 19h 50m 37.33 and +40° 35` 59.2 .

Proper Motion of V380 Cygni

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 -7.23 ± 0.22 miliarcseconds/year towards the north and -2.46 ± 0.24 miliarcseconds/year east if we saw them in the horizon. The Radial Velocity, that is the speed at which the star is moving away/towards us is 1.82000 km/s with an error of about 0.74 km/s .

V380 Cygni Luminosity

Luminosity is the amount of energy that a star pumps out and its relative to the amount that our star, the Sun gives out. The figure of 2,584.67 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

Physical Properties (Colour, Temperature) of V380 Cygni

V380 Cygni has a spectral type of B1III. This means the star is a blue giant star. The star is 7,267.00 Parsecs from the Galactic Centre or terms of Light Years is 23,702.29 s. The star has a B-V Colour Index of -0.05 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 10,395 Kelvin.

V380 Cygni Radius has been calculated as being 16.57 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 11,528,588.81.km. If you need the diameter of the star, you just need to multiple the radius by 2. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 13.65. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures. The star's Iron Abundance is 1.25 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

V380 Cygni Apparent and Absolute Magnitudes

V380 Cygni has an apparent magnitude of 5.68 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 -3.80 If you used the 2007 Parallax value, you would get an absolute magnitude of -3.38. 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 V380 Cygni

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 1.27 which gave the calculated distance to V380 Cygni as 2568.22 light years away from Earth or 787.40 parsecs. It would take a spaceship travelling at the speed of light, 2568.22 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

In 2007, Hipparcos data was revised with a new parallax of 1.54 which put V380 Cygni at a distance of 2117.94 light years or 649.35 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.

The star's Galacto-Centric Distance is 7,267.00 Parsecs or 23,702.29 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Variable Type of V380 Cygni

The star is a eclipsing binary system Beta Persei (Algol) 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. V380 Cygni brightness ranges from a magnitude of 5.750 to a magnitude of 5.630 over its variable period. The smaller the magnitude, the brighter the star.

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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V380 Cygni Facts

Visual Facts


Primary / Proper / Traditional NameV380 Cygni
Alternative NamesV380 Cyg, HD 187879, HIP 97634, HR 7567, BD+40 3902, V380 Cyg
Spectral TypeB1III
Multiple Star SystemNo / Unknown
Star TypeGiant Star
Colour blue
GalaxyMilky Way
ConstellationCygnus
Absolute Magnitude-3.80 / -3.38
Visual / Apparent Magnitude5.68
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)19h 50m 37.33
Declination (Dec.)+40° 35` 59.2
Galactic Latitude7.13 degrees
Galactic Longitude75.22 degrees
1997 Distance from Earth1.27 Parallax (milliarcseconds)
 2568.22 Light Years
 787.40 Parsecs
2007 Distance from Earth1.54 Parallax (milliarcseconds)
 2117.94 Light Years
 649.35 Parsecs
Galacto-Centric Distance23,702.29 Light Years / 7,267.00 Parsecs
Proper Motion Dec.-7.23 ± 0.22 milliarcseconds/year
Proper Motion RA.-2.46 ± 0.24 milliarcseconds/year
B-V Index-0.05
Radial Velocity1.82 ± 0.74 km/s
Iron Abundance1.25 ± 9.99 Fe/H
Eccentricity0.14
Semi-Major Axis8159.00
Stellar Luminosity (Lsun)2,584.67

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassEclipsing binary system
Variable Star TypeBeta Persei (Algol)
Variable Magnitude Range (Brighter - Dimmer)5.630 - 5.750

Estimated Facts


Calculated Effective Temperature10,395 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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