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CR Piscium

CR Piscium Facts

  • CR Piscium is a variable star that can be located in the constellation of Pisces. The description is based on the spectral class.
  • CR Piscium is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (M...) of the star, the star's colour is red .
  • 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 7248.07 light years away from us. Distance

CR Piscium's Alternative Names

HIP5091 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD6409.

CR Piscium has alternative name(s) :- , CR 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+18 145.

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

Location of CR 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 CR Piscium, the location is 01h 05m 12.21 and +19° 11` 52.1 .

Radial Velocity and Proper Motion of CR 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 -11.23 ± 0.46 milliarcseconds/year towards the north and 5.69 ± 0.73 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 -5.13 km/s with an error of about 0.17 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 CR Piscium

CR Piscium Temperature and Colour

Based on the star's spectral type of M... , CR Piscium's colour and type is red variable star. The star has a B-V Colour Index of 1.5 which means the star's temperature is about 4,014 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

CR Piscium Radius

CR Piscium estimated radius has been calculated as being 25.81 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 17,957,227.26.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 139.25. 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.

CR Piscium Apparent and Absolute Magnitudes

CR Piscium has an apparent magnitude of 7.44 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 -0.63 If you used the 2007 Parallax value, you would get an absolute magnitude of -4.29. 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 CR Piscium

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 2.43 which gave the calculated distance to CR Piscium as 1342.24 light years away from Earth or 411.52 parsecs. If you want that in miles, it is about 7,890,526,120,901,968.69, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 0.45 which put CR Piscium at a distance of 7248.07 light years or 2222.22 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.

Using the 2007 distance, the star is roughly 458,362,583.82 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.

Travel Time to CR 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)
Walking41,215,169,067,539.01
Car12040,505,635,584.63
Airbus A3807366,604,179,714.89
Speed of Sound (Mach 1)767.2696,335,035,391.96
Concorde (Mach 2)1,534.543,167,513,567.69
New Horizons Probe33,000147,293,220.31
Speed of Light670,616,629.007,248.07
CR Piscium brightness ranges from a magnitude of 7.521 to a magnitude of 7.417 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 CR Piscium Facts and Figures

Visual Facts


Primary / Proper / Traditional NameCR Piscium
Alternative NamesHD 6409, HIP 5091, BD+18 145, CR Psc
Spectral TypeM...
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
ColourRed
GalaxyMilky Way
ConstellationPisces
Absolute Magnitude -0.63 / -4.29
Visual / Apparent Magnitude7.44
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)01h 05m 12.21
Declination (Dec.)+19° 11` 52.1
Galactic Latitude-43.55 degrees
Galactic Longitude127.42 degrees
1997 Distance from Earth2.43 Parallax (milliarcseconds)
 1342.24 Light Years
 411.52 Parsecs
2007 Distance from Earth0.45 Parallax (milliarcseconds)
 7248.07 Light Years
 2222.22 Parsecs
 458,362,583.82 Astronomical Units
Proper Motion Dec.-11.23 ± 0.46 milliarcseconds/year
Proper Motion RA.5.69 ± 0.73 milliarcseconds/year
B-V Index1.50
Radial Velocity-5.13 ± 0.17 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Mean Variability Period in Days0.082
Variable Magnitude Range (Brighter - Dimmer)7.417 - 7.521

Estimated Calculated Facts


Radius (x the Sun)139.25
Effective Temperature4,014 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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