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Anser, Alpha Vulpeculae, 6 Vulpeculae, HD183439, HIP95771, HR7405

Anser (Alpha Vulpeculae) is a red star that can be located in the constellation of Vulpecula. Anser is the 1st 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.

Alpha Vulpeculae is the Bayer Classification for the star. The Id of the star in the Yale Bright Star Catalogue is HR7405. HIP95771 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD183439.

Anser has alternative name(s), Lucida Anseris , NSV 12069.

Location of Anser

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 Anser, the location is 19h 28m 42.41 and +24d 39` 54.6 .

Proper Motion of Anser

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 -107.44 ± 0.20 miliarcseconds/year towards the north and -126.13 ± 0.28 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 -85.53000 km/s with an error of about 0.11 km/s .

Physical Properties (Colour, Temperature, Radius) of Anser

Anser has a spectral type of M0 comp. This means the star is a red star. The star is 7354.00000000 Parsecs from the Galactic Centre or terms of Light Years is 23986.0523177600000000s. The star has a B-V Colour Index of 1.5 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,014 Kelvin.

Anser Radius has been calculated as being 22.69 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 15,784,707.19.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 22.79. 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 -0.38 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

Anser Apparent and Absolute Magnitudes

Anser has an apparent magnitude of 4.44 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 -0.35 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.36. 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 Anser

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 11.00 which gave the calculated distance to Anser as 296.51 light years away from Earth or 90.91 parsecs. It would take a spaceship travelling at the speed of light, 296.51 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 10.97 which put Anser at a distance of 297.32 light years or 91.16 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 7,354.00 Parsecs or 23,986.05 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*. Anser brightness ranges from a magnitude of 4.559 to a magnitude of 4.528 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.0 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.

Anser Facts

Alternative Names

Traditional/Proper NameAnser
Flamsteed Name6 Vulpeculae
Flamsteed Short Name6 Vul
Short NameNSV 12069
Bayer DesignationAlpha Vulpeculae
Alternative Name(s)Lucida Anseris
Hipparcos Library I.D.95771
Yale Bright Star Catalogue (HR) Id7405
Bonner DurchmusterungBD+24 3759
Henry Draper Designation183439

Visual Facts

Star Type star
Absolute Magnitude-0.35 / -0.36
Visual / Apparent Magnitude4.44
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)19h 28m 42.41
Declination (Dec.)+24d 39` 54.6
Galactic Latitude3.40 degrees
Galactic Longitude58.99 degrees
1997 Distance from Earth11.00 Parallax (milliarcseconds)
 296.51 Light Years
 90.91 Parsecs
2007 Revised Distance from Earth10.97 Parallax (milliarcseconds)
 297.32 Light Years
 91.16 Parsecs
Galacto-Centric Distance23,986.05 Light Years / 7,354.00 Parsecs
Proper Motion Dec.-107.44 ± 0.20 milliarcseconds/year
Proper Motion RA.-126.13 ± 0.28 milliarcseconds/year
B-V Index1.50
Radial Velocity-85.53 ± 0.11 km/s
Iron Abundance-0.38 ± 9.99 Fe/H
Spectral TypeM0 comp
Colour(M) Red

Variable Star Details

Mean Variability Period in Days0.021
Variable Magnitude Range (Brighter - Dimmer)4.528 - 4.559

Estimated Facts

Calculated Effective Temperature4,014 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

Location of Anser in Vulpecula

Anser (Alpha Vulpeculae) Location in Vulpecula

The map was generated using Night Vision, an awesome free application by Brian Simpson.

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