Universe Guide


V363 Pegasi, HD224186, HIP117986

V363 Pegasi is a red pulsating star that can be located in the constellation of Pegasus. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

HIP117986 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD224186.

V363 Pegasi has alternative name(s), V363 Peg.

Location of V363 Pegasi

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 V363 Pegasi, the location is 23h 55m 54.63 and +15d13`49.1 .

Proper Motion of V363 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 -7.62 ± 0.25 miliarcseconds/year towards the north and 80.50 ± 0.40 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of V363 Pegasi

V363 Pegasi has a spectral type of M3. This means the star is a red star. The star is 7436.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24253.5062598400000000s. The star has a B-V Colour Index of 1.56 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 3,878 Kelvin.

V363 Pegasi Radius has been calculated as being 24.30 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 16,911,247.94.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 21.56. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

V363 Pegasi Apparent and Absolute Magnitudes

V363 Pegasi has an apparent magnitude of 6.45 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 -0.09. 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 V363 Pegasi

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 4.37 which gave the calculated distance to V363 Pegasi as 746.37 light years away from Earth or 228.83 parsecs. It would take a spaceship travelling at the speed of light, 746.37 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 4.93 which put V363 Pegasi at a distance of 661.59 light years or 202.84 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 7,436.00 Parsecs or 24,253.51 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 V363 Pegasi

The star is a pulsating Semi-Regular Star which are giants or supergiants of intermediate and late spectral 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. V363 Pegasi brightness ranges from a magnitude of 6.510 to a magnitude of 6.366 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.1 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.

V363 Pegasi Facts

Alternative Names

Traditional/Proper NameV363 Pegasi
Short NameV363 Peg
Hipparcos Library I.D.117986
Bonner DurchmusterungBD+14 5074
Henry Draper Designation224186

Visual Facts

Star Type star
Absolute Magnitude-0.35 / -0.09
Visual / Apparent Magnitude6.45
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)23h 55m 54.63
Declination (Dec.)+15d13`49.1
Galactic Latitude-45.55 degrees
Galactic Longitude103.63 degrees
1997 Distance from Earth4.37 Parallax (milliarcseconds)
 746.37 Light Years
 228.83 Parsecs
2007 Revised Distance from Earth4.93 Parallax (milliarcseconds)
 661.59 Light Years
 202.84 Parsecs
Galacto-Centric Distance24,253.51 Light Years / 7,436.00 Parsecs
Proper Motion Dec.-7.62 ± 0.25 milliarcseconds/year
Proper Motion RA.80.50 ± 0.40 milliarcseconds/year
B-V Index1.56
Radial Velocity5.03 ± 0.33 km/s
Spectral TypeM3
Colour(M) Red

Variable Star Details

Variable Star ClassPulsating
Variable Star TypeSemi-Regular Star which are giants or supergiants of intermediate and late spectral
Mean Variability Period in Days0.137
Variable Magnitude Range (Brighter - Dimmer)6.366 - 6.510

Estimated Facts

Calculated Effective Temperature3,878 Kelvin

Sources and Links

SIMBAD SourceLink

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