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X Vulpeculae, HD339279, HIP98212

X Vulpeculae is a blue to white pulsating supergiant star that can be located in the constellation of Vulpecula. 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.

X Vulpeculae's Alternative Names

HIP98212 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD339279.

X Vulpeculae has alternative name(s) :- , X Vul.

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+26 3741.

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

Location of X Vulpeculae

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 X Vulpeculae, the location is 19h 57m 28.61 and +26° 33` 23.3 .

Radial Velocity and Proper Motion of X 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 -3.60 ± 1.06 miliarcseconds/year towards the north and -0.71 ± 1.70 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 the Sun is -14.70 km/s with an error of about 0.30 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 (Colour, Temperature) of X Vulpeculae

X Vulpeculae has a spectral type of F8Ia. This means the star is a blue to white 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.

X Vulpeculae Apparent and Absolute Magnitudes

X Vulpeculae has an apparent magnitude of 8.87 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 -5.40. 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 X Vulpeculae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as -0.33 which gave the calculated distance to X Vulpeculae as -9883.74 light years away from Earth or -3030.30 parsecs. It would take a spaceship travelling at the speed of light, -9883.74 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 0.14 which put X Vulpeculae at a distance of 23297.38 light years or 7142.86 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 X Vulpeculae

The star is a pulsating Delta Cepheid 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. X Vulpeculae brightness ranges from a magnitude of 9.344 to a magnitude of 8.576 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 6.3 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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X Vulpeculae Facts

Visual Facts


Primary / Proper / Traditional NameX Vulpeculae
Alternative NamesHD 339279, HIP 98212, BD+26 3741, X Vul
Spectral TypeF8Ia
Multiple Star SystemNo / Unknown
Star Type very luminous Supergiant Star
Colour blue to white
GalaxyMilky Way
ConstellationVulpecula
Visual / Apparent Magnitude8.87
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)19h 57m 28.61
Declination (Dec.)+26° 33` 23.3
Galactic Latitude-1.28 degrees
Galactic Longitude63.86 degrees
1997 Distance from Earth-0.33 Parallax (milliarcseconds)
 -9883.74 Light Years
 -3030.30 Parsecs
2007 Distance from Earth0.14 Parallax (milliarcseconds)
 23297.38 Light Years
 7142.86 Parsecs
Proper Motion Dec.-3.60 ± 1.06 milliarcseconds/year
Proper Motion RA.-0.71 ± 1.70 milliarcseconds/year
B-V Index1.27
Radial Velocity-14.70 ± 0.30 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeDelta Cepheid
Mean Variability Period in Days6.320
Variable Magnitude Range (Brighter - Dimmer)8.576 - 9.344

Estimated Facts


Calculated Effective Temperature4,440 Kelvin

Sources and Links


SIMBAD SourceLink

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