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Jih (Kappa Pegasi) - HD206901 - HIP107354

Jih (Kappa Pegasi) is a blue to white subgiant 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. The star has an estimated age of 1.20 Billion of Years but could be as young as 1.10 to 1.30 according to Hipparcos.

Kappa Pegasi is the Bayer Classification for the star. HIP107354 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD206901.

Jih has alternative name(s), 10 Pegasi , 10 Peg. Jih is a multiple star system with 2 stars orbiting in its solar system.

Location of Jih

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 Jih, the location is 21h 44m 38.70 and +25d38`42.0 .

Proper Motion of Jih

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 14.29 ± 0.56 miliarcseconds/year towards the north and 48.13 ± 0.74 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Age, Radius) of Jih

Jih has a spectral type of F5IV. This means the star is a blue to white subgiant star. The star is 7394.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24116.5176553600000000s. The star has a B-V Colour Index of 0.42 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 6,635 Kelvin.

Jih Radius has been calculated as being 3.71 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 2,580,430.88.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 3.59. 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 -0.18 with an error value of 0.04 Fe/H with the Sun has a value of 1 to put it into context.

The stars age according to Hipparcos data files put the star at an age of about 1.20 Billion years old but could be between 1.10 and 1.30 Billion years old. In comparison, the Sun's age is about 4.6 Billion Years Old.

Jih Apparent and Absolute Magnitudes

Jih has an apparent magnitude of 4.14 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 1.40 If you used the 2007 Parallax value, you would get an absolute magnitude of 1.47. 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 Jih

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 28.34 which gave the calculated distance to Jih as 115.09 light years away from Earth or 35.29 parsecs. It would take a spaceship travelling at the speed of light, 115.09 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 29.22 which put Jih at a distance of 111.62 light years or 34.22 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 7,394.00 Parsecs or 24,116.52 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

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.

Jih Facts

Alternative Names

Traditional/Proper NameJih
Short Name10 Peg
Bayer DesignationKappa Pegasi
Alternative Name(s)10 Pegasi
Hipparcos Library I.D.107354
Bonner DurchmusterungBDD+24 4463
Henry Draper Designation206901

Visual Facts

Star Typesubgiant star
Age1.20 Billion Years Old
Age Range1.10 - 1.30 Billion Years Old
Absolute Magnitude1.40 / 1.47
Visual / Apparent Magnitude4.14
Naked Eye VisibleYes - Ref: Wiki
Right Ascension (R.A.)21h 44m 38.70
Declination (Dec.)+25d38`42.0
Galactic Latitude-20.67 degrees
Galactic Longitude78.41 degrees
1997 Distance from Earth28.34 Parallax (milliarcseconds)
 115.09 Light Years
 35.29 Parsecs
2007 Revised Distance from Earth29.22 Parallax (milliarcseconds)
 111.62 Light Years
 34.22 Parsecs
Galacto-Centric Distance24,116.52 Light Years / 7,394.00 Parsecs
Proper Motion Dec.14.29 ± 0.56 milliarcseconds/year
Proper Motion RA.48.13 ± 0.74 milliarcseconds/year
B-V Index0.42
Radial Velocity-0.80 ± 0.20 km/s
Iron Abundance-0.18 ± 0.04 Fe/H
Spectral TypeF5IV
Colour(F) blue to white
Stars in Solar System2

Estimated Facts

Calculated Effective Temperature6,635 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

Multi-Star System

The star has been identified as being a multi-star system, one in which there is at least one star in close orbit to another star or two or more stars orbiting a central point. The stars may be of equal mass, unequal mass where one star is stronger than the other or be in groups orbiting a central point which doesn't necessarily have to be a star. More information can be found on my dedicated multiple star systems page. The source of the info is Simbad. The file is dated 2000 so any differences between this and any other source will be down to the actual source from where the information came from.


Proper Motion mas/yr
H.D. IdB.D. IdStar CodeMagnitudeR.A.Dec.SpectrumColourYear
206901+24 4463.0A4.8000036.0000013.00000F5Yellow/White
B5.300001880
C10.800001958

Location of Jih in Pegasus


Jih (Kappa Pegasi) Location in Pegasus

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


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