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V354 Pegasi, HD221394, HIP116119

V354 Pegasi is a blue variable star that can be located in the constellation of Pegasus. 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.

V354 Pegasi's Alternative Names

HIP116119 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD221394.

V354 Pegasi has alternative name(s) :- , V354 Peg.

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+27 4568.

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

Location of V354 Pegasi

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 V354 Pegasi, the location is 23h 31m 43.05 and +28° 24` 12.7 .

Proper Motion of V354 Pegasi

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 -14.43 ± 0.23 miliarcseconds/year towards the north and -29.96 ± 0.36 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 -6.50000 km/s with an error of about 2.70 km/s .

V354 Pegasi 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 41.76 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 V354 Pegasi

V354 Pegasi has a spectral type of A1p Sr(CrEu). This means the star is a blue variable star. The star is 7,425.00 Parsecs from the Galactic Centre or terms of Light Years is 24,217.63 s. The star has a B-V Colour Index of 0.03 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 9,610 Kelvin.

V354 Pegasi Radius has been calculated as being 2.59 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,802,749.81.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 2.27. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

V354 Pegasi Apparent and Absolute Magnitudes

V354 Pegasi has an apparent magnitude of 6.41 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 0.57 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.86. 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 V354 Pegasi

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 6.78 which gave the calculated distance to V354 Pegasi as 481.07 light years away from Earth or 147.49 parsecs. It would take a spaceship travelling at the speed of light, 481.07 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 7.75 which put V354 Pegasi at a distance of 420.86 light years or 129.03 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 7,425.00 Parsecs or 24,217.63 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*. V354 Pegasi brightness ranges from a magnitude of 6.439 to a magnitude of 6.398 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 2.9 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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V354 Pegasi Facts

Visual Facts

 V354 Pegasi
Alternative NamesHD 221394, HIP 116119, BD+27 4568, V354 Peg
Spectral TypeA1p Sr(CrEu)
Multiple Star SystemNo / Unknown
Star TypeVariable Star
Colour blue
GalaxyMilky Way
Absolute Magnitude0.57 / 0.86
Visual / Apparent Magnitude6.41
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)23h 31m 43.05
Declination (Dec.)+28° 24` 12.7
Galactic Latitude-31.27 degrees
Galactic Longitude102.40 degrees
1997 Distance from Earth6.78 Parallax (milliarcseconds)
 481.07 Light Years
 147.49 Parsecs
2007 Distance from Earth7.75 Parallax (milliarcseconds)
 420.86 Light Years
 129.03 Parsecs
Galacto-Centric Distance24,217.63 Light Years / 7,425.00 Parsecs
Proper Motion Dec.-14.43 ± 0.23 milliarcseconds/year
Proper Motion RA.-29.96 ± 0.36 milliarcseconds/year
B-V Index0.03
Radial Velocity-6.50 ± 2.70 km/s
Semi-Major Axis8614.00
Stellar Luminosity (Lsun)41.76

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Variable Star Details

Mean Variability Period in Days2.861
Variable Magnitude Range (Brighter - Dimmer)6.398 - 6.439

Estimated Facts

Calculated Effective Temperature9,610 Kelvin

Sources and Links

SIMBAD SourceLink

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