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PS Vulpeculae, HD186518, HIP97091

PS Vulpeculae is a blue eclipsing binary system main sequence dwarf star that can be located in the constellation of Vulpecula. PS Vulpeculae is the brightest star in Vulpecula based on the Hipparcos 2007 apparent magnitude. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

HIP97091 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD186518.

PS Vulpeculae has alternative name(s), PS Vul.

Location of PS Vulpeculae

The location of the star in the galaxy 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 PS Vulpeculae, the location is 19h 43m 55.97 and +27d 08` 07.5 .

Proper Motion of PS Vulpeculae

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 -3.38 ± 0.56 miliarcseconds/year towards the north and 0.92 ± 0.81 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 -19.20000 km/s with an error of about 0.30 km/s .

Physical Properties (Colour, Temperature, Radius) of PS Vulpeculae

PS Vulpeculae has a spectral type of B7V + G1:III. This means the star is a blue main sequence dwarf star. The star has a B-V Colour Index of 1.01 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,830 Kelvin.

PS Vulpeculae Radius has been calculated as being 98.87 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 68,791,736.91.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 56.37. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

PS Vulpeculae Apparent and Absolute Magnitudes

PS Vulpeculae has an apparent magnitude of 6.27 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 -4.35 If you used the 2007 Parallax value, you would get an absolute magnitude of -3.13. 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 PS Vulpeculae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 0.75 which gave the calculated distance to PS Vulpeculae as 4348.84 light years away from Earth or 1333.33 parsecs. It would take a spaceship travelling at the speed of light, 4348.84 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 1.32 which put PS Vulpeculae at a distance of 2470.93 light years or 757.58 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.

Variable Type of PS Vulpeculae

The star is a eclipsing binary system Eclipsing 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. PS Vulpeculae brightness ranges from a magnitude of 6.470 to a magnitude of 6.400 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 3.8 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.

PS Vulpeculae Facts

Alternative Names

Traditional/Proper NamePS Vulpeculae
Short NamePS Vul
Hipparcos Library I.D.97091
Bonner DurchmusterungBD+26 3654
Henry Draper Designation186518

Visual Facts

Star Typemain sequence dwarf star
Absolute Magnitude-4.35 / -3.13
Visual / Apparent Magnitude6.27
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)19h 43m 55.97
Declination (Dec.)+27d 08` 07.5
Galactic Latitude1.61 degrees
Galactic Longitude62.82 degrees
1997 Distance from Earth0.75 Parallax (milliarcseconds)
 4348.84 Light Years
 1333.33 Parsecs
2007 Revised Distance from Earth1.32 Parallax (milliarcseconds)
 2470.93 Light Years
 757.58 Parsecs
Proper Motion Dec.-3.38 ± 0.56 milliarcseconds/year
Proper Motion RA.0.92 ± 0.81 milliarcseconds/year
B-V Index1.01
Radial Velocity-19.20 ± 0.30 km/s
Spectral TypeB7V + G1:III
Colour(B) blue

Variable Star Details

Variable Star ClassEclipsing binary system
Variable Star TypeEclipsing
Mean Variability Period in Days3.817
Variable Magnitude Range (Brighter - Dimmer)6.400 - 6.470

Estimated Facts

Calculated Effective Temperature4,830 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

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
186518+26 3654.0A6.800001.00000-3.00000K0Orange

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