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100 Piscium, HD9656, HIP7364

100 Piscium is a blue main sequence dwarf star that can be located in the constellation of Pisces. The description is based on the spectral class. 100 Piscium is not part of the constellation 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.

100 Piscium's Alternative Names

HIP7364 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD9656.

Flamsteed designations are named after the creator, Sir John Flamsteed. Sir John numbered the stars in the constellation with a number and the latin name, this star's Flamsteed designation is 100 Piscium with it shortened to 100 Psc.

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+11 201.

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

Location of 100 Piscium

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 100 Piscium, the location is 01h 34m 51.61 and +12° 33` 31.2 .

Radial Velocity and Proper Motion of 100 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 -6.98 ± 1.31 miliarcseconds/year towards the north and 20.09 ± 2.12 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 the Sun is 8.50 km/s with an error of about 3.20 km/s . When the value is negative then the star and the Sun are getting closer to one another, likewise, a positive number means that two stars are moving away. Its nothing to fear as the stars are so far apart, they won't collide in our life-time, if ever.

Physical Properties (Colour, Temperature) of 100 Piscium

100 Piscium has a spectral type of A3V. This means the star is a blue main sequence dwarf star. The star has a B-V Colour Index of 0.19 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 7,827 Kelvin.

100 Piscium Radius has been calculated as being 1.48 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,028,420.80.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 4.11. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

100 Piscium Apparent and Absolute Magnitudes

100 Piscium has an apparent magnitude of 7.28 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 2.68 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.46. 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 100 Piscium

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 12.00 which gave the calculated distance to 100 Piscium as 271.80 light years away from Earth or 83.33 parsecs. It would take a spaceship travelling at the speed of light, 271.80 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 4.32 which put 100 Piscium at a distance of 755.01 light years or 231.48 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.

Using the 2007 distance, the star is roughly 47,745,844.65 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.

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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100 Piscium Facts

Visual Facts


Primary / Proper / Traditional Name100 Piscium
Alternative NamesHD 9656, HIP 7364, 100 Psc, BD+11 201
Spectral TypeA3V
Constellation's Main StarNo
Multiple Star SystemYes
Star Type main sequence Dwarf Star
Colour blue
GalaxyMilky Way
ConstellationPisces
Absolute Magnitude 2.68 / 0.46
Visual / Apparent Magnitude7.28
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)01h 34m 51.61
Declination (Dec.)+12° 33` 31.2
Galactic Latitude-48.94 degrees
Galactic Longitude139.18 degrees
1997 Distance from Earth12.00 Parallax (milliarcseconds)
 271.80 Light Years
 83.33 Parsecs
2007 Distance from Earth4.32 Parallax (milliarcseconds)
 755.01 Light Years
 231.48 Parsecs
 47,745,844.65 Astronomical Units
Proper Motion Dec.-6.98 ± 1.31 milliarcseconds/year
Proper Motion RA.20.09 ± 2.12 milliarcseconds/year
B-V Index0.19
Radial Velocity8.50 ± 3.20 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Facts


Calculated Effective Temperature7,827 Kelvin

Sources and Links


SIMBAD SourceLink

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