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V391 Pegasi

V391 Pegasi Facts

V391 Pegasi's Alternative Names

V391 Pegasi has alternative name(s) :- V391 Peg.

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

Location of V391 Pegasi

The location of the subdwarf 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 object is compared to the celestial equator and is expressed in degrees. For V391 Pegasi, the location is 22h 04m 12.00 and 26° 25` 08.00 .

Physical Properties (Age, Radius) of V391 Pegasi

V391 Pegasi has a spectral type of sdB.

V391 Pegasi has been calculated as 0.23 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 160,034.00.km. If you need the diameter of the star, you just need to multiple the radius by 2.

The star is believed to be about 10.00 Billion years old. To put in context, the Sun is believed to be about five billion years old and the Universe is about 13.8 billion years old.

V391 Pegasi Apparent and Absolute Magnitudes

V391 Pegasi has an apparent magnitude of 14.57 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. Using the supplied Parallax value, you would get an absolute magnitude of 3.84 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 V391 Pegasi

The Parallax of the star is given as 0.71 which gives a calculated distance to V391 Pegasi of 4566.20 light years from the Earth or 1399.97 parsecs. It would take a spaceship travelling at the speed of light, 4566.20 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

The star is roughly 288,762,528.68 Astronomical Units from the Earth/Sun give or take a few. An Astronomical Unit is the distance between Earth and the Sun. The number of A.U. is the number of times that the star is from the Earth compared to the Sun.

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Additional V391 Pegasi Facts and Figures

Visual Facts


Primary / Proper / Traditional NameV391 Pegasi
Alternative NamesV391 Peg
Spectral TypesdB
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeSubdwarf Star
GalaxyMilky Way
ConstellationPegasus
Age10.00 Billion Years Old
Visual / Apparent Magnitude14.57
Naked Eye VisibleRequires 8m Telescope - Magnitudes
Right Ascension (R.A.)22h 04m 12.00
Declination (Dec.)26° 25` 08.00
Distance from Earth0.71 Parallax (milliarcseconds)
 4566.20 Light Years
 1399.97 Parsecs
 288,762,528.68 Astronomical Units

Companions (Multi-Star and Exoplanets) Facts


Exoplanet Count1

Estimated Calculated Facts


Radius (x the Sun)0.23

Sources and Links


Sourcehttp://www.exoplanets.eu

List of Extrasolar Planets orbiting V391 Pegasi


NameStatusMass (Jupiters)Orbital Period (Days)EccentricityDiscoveredSemi-Major AxisPeriastron
V391 Peg bConfirmed0.71170.0000.020071.7

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