Universe Guide


Chi Piscium, 84 Piscium, HD7087, HIP5571

Chi Piscium is a orange to red giant star that can be located in the constellation of Pisces. Chi Piscium is the brightest star in Pisces based on the Hipparcos 2007 apparent magnitude. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

Chi Piscium is the Bayer Classification for the star. HIP5571 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD7087.

Location of Chi Piscium

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 Chi Piscium, the location is 01h 11m 27.19 and +21d02`04.8 .

Proper Motion of Chi Piscium

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 -10.48 ± 0.12 miliarcseconds/year towards the north and 39.32 ± 0.21 miliarcseconds/year east if we saw them in the horizon.

Chi Piscium 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 96.0000000 that I have given is based on the Spectral Types page that I have found on the Internet. You might find a different figure, one that may have been calculated rather than generalised that I have done. The figure is always the amount times the luminosity of the Sun. It is an imprecise figure because of a number of factors including but not limited to whether the star is a variable star and distance.

Physical Properties (Colour, Temperature, Radius) of Chi Piscium

Chi Piscium has a spectral type of K0III. This means the star is a orange to red giant star. The star is 7456.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24318.7389286400000000s. The star has a B-V Colour Index of 1 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,849 Kelvin.

Chi Piscium Radius has been calculated as being 20.87 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 14,524,232.13.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 18.18. 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 -0.11 with an error value of 0.03 Fe/H with the Sun has a value of 1 to put it into context.

Chi Piscium Apparent and Absolute Magnitudes

Chi Piscium has an apparent magnitude of 4.66 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 -0.99 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.69. 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 Chi Piscium

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 7.42 which gave the calculated distance to Chi Piscium as 439.57 light years away from Earth or 134.77 parsecs. It would take a spaceship travelling at the speed of light, 439.57 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 8.50 which put Chi Piscium at a distance of 383.72 light years or 117.65 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 7,456.00 Parsecs or 24,318.74 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.

Chi Piscium Facts

Alternative Names

Flamsteed Name84 Piscium
Flamsteed Short Name84 Psc
Bayer DesignationChi Piscium
Hipparcos Library I.D.5571
Bonner DurchmusterungBD+20 172
Henry Draper Designation7087

Visual Facts

Star Typegiant star
Absolute Magnitude-0.99 / -0.69
Visual / Apparent Magnitude4.66
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)01h 11m 27.19
Declination (Dec.)+21d02`04.8
Galactic Latitude-41.59 degrees
Galactic Longitude129.18 degrees
1997 Distance from Earth7.42 Parallax (milliarcseconds)
 439.57 Light Years
 134.77 Parsecs
2007 Revised Distance from Earth8.50 Parallax (milliarcseconds)
 383.72 Light Years
 117.65 Parsecs
Galacto-Centric Distance24,318.74 Light Years / 7,456.00 Parsecs
Proper Motion Dec.-10.48 ± 0.12 milliarcseconds/year
Proper Motion RA.39.32 ± 0.21 milliarcseconds/year
B-V Index1.00
Radial Velocity15.04 ± 0.21 km/s
Iron Abundance-0.11 ± 0.03 Fe/H
Spectral TypeK0III
Colour(K) Orange to Red

Estimated Facts

Luminosity (x the Sun)96.0000000
Calculated Effective Temperature4,849 Kelvin

Sources and Links

SIMBAD SourceLink

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