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AR Piscium

AR Piscium Facts

  • AR Piscium is a eruptive variable star that can be located in the constellation of Pisces. The description is based on the spectral class.
  • AR Piscium is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (G5) of the star, the star's colour is yellow .
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 147.45 light years away from us. Distance

AR Piscium's Alternative Names

HIP6454 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD8357. The Gliese ID of the star is GJ 3095. The star was added to the Gliese catalogue in 1970 by Richard van der Riet Woolley hence the GJ prefix rather than GL prefix.Star Names.

AR Piscium has alternative name(s) :- , AR 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+06 211.

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

Location of AR Piscium

The location of the variable 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 AR Piscium, the location is 01h 22m 56.70 and +07° 25` 07.3 .

Radial Velocity and Proper Motion of AR Piscium

Proper Motion

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 230.61 ± 0.34 milliarcseconds/year towards the north and 92.89 ± 0.52 milliarcseconds/year east if we saw them in the horizon.

Radial Velocity

The Radial Velocity, that is the speed at which the star is moving away/towards the Sun is 18.17000 km/s with an error of about 0.07 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 of AR Piscium

AR Piscium Temperature and Colour

Based on the star's spectral type of G5 , AR Piscium's colour and type is yellow variable star. The star has a B-V Colour Index of 0.8 which means the star's temperature is about 5,422 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

AR 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 2.56 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

AR Piscium Radius

AR Piscium estimated radius has been calculated as being 1.66 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,156,190.34.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 1.661670511587522835839282975. The figure is derived at by using the formula from SDSS rather than peer reviewed papers. It has been known to produce widely incorrect figures.

AR Piscium Iron Abundance

AR Piscium Iron Abundance is -0.99 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context. The value comes from the Hipparcos Extended Catalog.

AR Piscium Apparent and Absolute Magnitudes

AR Piscium has an apparent magnitude of 7.30 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 4.02 If you used the 2007 Parallax value, you would get an absolute magnitude of 4.02. 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 AR Piscium

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 22.13000 which gave the calculated distance to AR Piscium as 147.39 light years away from Earth or 45.19 parsecs. If you want that in miles, it is about 866,450,593,753,532.28, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 22.12000 which put AR Piscium at a distance of 147.45 light years or 45.21 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 9,325,166.91 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. The star's Galacto-Centric Distance is 7,419.00 Parsecs or 24,198.06 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Travel Time to AR Piscium

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)
Walking424,720,605,486.51
Car120824,020,182.88
Airbus A380736134,351,116.77
Speed of Sound (Mach 1)767.269128,875,820.53
Concorde (Mach 2)1,534.5464,437,826.28
New Horizons Probe33,0002,996,437.03
Speed of Light670,616,629.00147.45

Variable Type of AR Piscium

The star is a eruptive Irregular variable type which means that its size changes over time. The Variable Type is usually named after the first star of that type to be spotted. AR Piscium brightness ranges from a magnitude of 7.517 to a magnitude of 7.405 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.1 days (variability).

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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Additional AR Piscium Facts and Figures

Visual Facts


Primary / Proper / Traditional NameAR Piscium
Alternative NamesHD 8357, HIP 6454, BD+06 211, Gliese 3095, AR Psc
Spectral TypeG5
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
ColourYellow
GalaxyMilky Way
ConstellationPisces
Absolute Magnitude 4.02 / 4.02
Visual / Apparent Magnitude7.30
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)01h 22m 56.70
Declination (Dec.)+07° 25` 07.3
Galactic Latitude-54.62051206 degrees
Galactic Longitude136.50658100 degrees
1997 Distance from Earth22.13000 Parallax (milliarcseconds)
 147.39 Light Years
 45.19 Parsecs
2007 Distance from Earth22.12000 Parallax (milliarcseconds)
 147.45 Light Years
 45.21 Parsecs
 9,325,166.91 Astronomical Units
Galacto-Centric Distance24,198.06 Light Years / 7,419.00 Parsecs
Proper Motion Dec.230.61000 ± 0.34000 milliarcseconds/year
Proper Motion RA.92.89000 ± 0.52000 milliarcseconds/year
B-V Index0.8
Radial Velocity18.17000 ± 0.07 km/s
Iron Abundance-0.9900 ± 9.99 Fe/H
Eccentricity0.51690
Semi-Major Axis12855.0000000
Stellar Luminosity (Lsun)2.5600000

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassEruptive
Variable Star TypeIrregular
Mean Variability Period in Days0.084
Variable Magnitude Range (Brighter - Dimmer)7.405 - 7.517

Estimated Calculated Facts


Radius (x the Sun)1.66
Effective Temperature5,422 Kelvin

Sources and Links


SIMBAD SourceLink

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