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HD 217107, HIP113421

HD 217107 is a white to yellow subgiant star that can be located in the constellation of Pisces. 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. The star has an estimated age of 7.50 Billion of Years but could be as young as 5.50 to 10.30 according to Hipparcos. HD 217107 has at least 2 Extrasolar Planets believed to be in orbit around the star.

HD 217107's Alternative Names

HIP113421 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD217107.

The Gould star designation is one that was designed by American astronomer, Benjamin Apthorp Gould. Gould stars are predominantly in the Southern and Equatorial constellations but do appear in northern constellations such as Bootes and Orion. The star has the designation 6 G. Piscium. There are no stars with a Gould designation in Ursa Major for example.

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-03 5539.

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

Location of HD 217107

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 HD 217107, the location is 22h 58m 15.54 and -02° 23` 43.2 .

Proper Motion of HD 217107

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 -15.80 ± 0.25 miliarcseconds/year towards the north and -6.35 ± 0.38 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 -13.40000 km/s with an error of about 0.10 km/s .

HD 217107 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 1.32 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, Metallicity, Age, Mass) of HD 217107

HD 217107 has a spectral type of G8IV. This means the star is a white to yellow subgiant star. The star is 7,396.00 Parsecs from the Galactic Centre or terms of Light Years is 24,123.04 s. The star has a B-V Colour Index of 0.74 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 5,446 Kelvin.

HD 217107 Radius has been calculated as being 1.20 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 837,888.86.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 1.22. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures. The star's solar mass is 1.02 times that of the Sun's. The Sun's Mass is 1,989,100,000,000,000,000,000 billion kg. which to calculate using this website is too large. To give idea of size, the Sun is 99.86% the mass of the solar system.

The star's metallicity is 0.370000, this value is the fractional amount of the star that is not Hydrogen (X) or Helium (Y). An older star would have a high metallicity whereas a new star would have a lower one.

The stars age according to Hipparcos data files put the star at an age of about 7.50 Billion years old but could be between 5.50 and 10.30 Billion years old. In comparison, the Sun's age is about 4.6 Billion Years Old.

HD 217107 Apparent and Absolute Magnitudes

HD 217107 has an apparent magnitude of 6.17 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 4.70 If you used the 2007 Parallax value, you would get an absolute magnitude of 4.68. 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 HD 217107

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 50.71 which gave the calculated distance to HD 217107 as 64.32 light years away from Earth or 19.72 parsecs. It would take a spaceship travelling at the speed of light, 64.32 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 50.36 which put HD 217107 at a distance of 64.77 light years or 19.86 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 7,396.00 Parsecs or 24,123.04 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.

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HD 217107 Facts

Visual Facts

Primary / Proper / Traditional NameHD 217107
Alternative NamesHD 217107, HIP 113421, 6 G. Piscium, BD-03 5539
Spectral TypeG8IV
Multiple Star SystemYes
Star TypeSubgiant Star
Colour white to yellow
GalaxyMilky Way
Age7.50 Billion Years Old
Age Range5.50 - 10.30 Billion Years Old
Absolute Magnitude4.70 / 4.68
Visual / Apparent Magnitude6.17
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)22h 58m 15.54
Declination (Dec.)-02° 23` 43.2
Galactic Latitude-53.32 degrees
Galactic Longitude70.47 degrees
1997 Distance from Earth50.71 Parallax (milliarcseconds)
 64.32 Light Years
 19.72 Parsecs
2007 Distance from Earth50.36 Parallax (milliarcseconds)
 64.77 Light Years
 19.86 Parsecs
Galacto-Centric Distance24,123.04 Light Years / 7,396.00 Parsecs
Proper Motion Dec.-15.80 ± 0.25 milliarcseconds/year
Proper Motion RA.-6.35 ± 0.38 milliarcseconds/year
B-V Index0.74
Radial Velocity-13.40 ± 0.10 km/s
Iron Abundance0.31 ± 0.01 Fe/H
Semi-Major Axis7909.00
Stellar Luminosity (Lsun)1.32

Companions (Multi-Star and Exoplanets) Facts

Exoplanet Count2

Estimated Facts

Calculated Effective Temperature5,446 Kelvin
Mass Compared to the Sun1.02

Sources and Links

SIMBAD SourceLink

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
217107-03 5539.0A6.20000-3.00000-18.00000G8Yellow

List of Extrasolar Planets orbiting HD 217107

NameStatusMass (Jupiters)Orbital Period (Days)EccentricityDiscoveredSemi-Major AxisPeriastronInclination
HD 217107 bConfirmed0.057.1270.13219980.07322.7001998.000
HD 217107 cConfirmed0.254210.0000.51719985.27198.6001998.000

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