Universe Guide

V391 Pegasi

V391 Pegasi Facts

  • V391 Pegasi is a subdwarf star that can be located in the constellation of Pegasus. The description is based on the spectral class.
  • V391 Pegasi is not part of the constellation outline but is within the borders of the constellation.
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • It is calculated at being 10.000 Billion Years old. This information comes from ExoPlanet.
  • V391 Pegasi has at least 1 Extrasolar Planets believed to be in orbit around the star.
  • V391 Pegasi has a radius that is 0.23 times bigger than the Suns. Radius
  • The star is calculated at being about 4566.20 light years away from us. Distance

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 of V391 Pegasi

V391 Pegasi Temperature and Colour

Based on the star's spectral type of sdB Based on the star's spectral, the stars temperature is between 0.00 and 0.00 degrees kelvin.

V391 Pegasi Radius

V391 Pegasi Radius has been calculated as being 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.

V391 Pegasi Estimated Age

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 0.71430 which gives a calculated distance to V391 Pegasi of 4566.20 light years from the Earth or 1399.97 parsecs. It is about 26,842,979,179,031,000 miles from Earth.

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.

Travel Time to V391 Pegasi

The time it will take to travel to this star is dependent on how fast you are going. U.G. has done some calculations as to how long it will take going at differing speeds. A note about the calculations, when I'm talking about years, I'm talking non-leap years only (365 days).

The New Horizons space probe is the fastest probe that we've sent into space at the time of writing. Its primary mission was to visit Pluto which at the time of launch (2006), Pluto was still a planet.

DescriptionSpeed (m.p.h.)Time (years)
Airbus A3807364,160,556,591.49
Speed of Sound (Mach 1)767.2693,990,998,790.96
Concorde (Mach 2)1,534.541,995,496,794.70
New Horizons Probe33,00092,793,019.74
Speed of Light670,616,629.004,566.20

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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
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 Earth0.71430 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
Calculated Temperature Range0.00 - 0.00

Sources and Links


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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