Universe Guide
HomeAliensConstellationsTelevision and Films ListFact ListGames ListWarcraftSearchTwitterFacebook

CW Piscium, HD8320, HIP6453

CW Piscium is a red pulsating variable star that can be located in the constellation of Pisces. The description is based on the spectral class. The star can not be seen by the naked eye, you need a telescope to see it.

CW Piscium's Alternative Names

HIP6453 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD8320.

CW Piscium has alternative name(s) :- , CW 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+31 236.

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

Location of CW 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 CW Piscium, the location is 01h 22m 56.43 and +31° 50` 28.4 .

Radial Velocity and Proper Motion of CW 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 -9.28 ± 0.60 miliarcseconds/year towards the north and 5.61 ± 0.86 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 1.09 km/s with an error of about 0.27 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 CW Piscium

CW Piscium has a spectral type of M.... This means the star is a red variable star. The star has a B-V Colour Index of 1.7 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 3,456 Kelvin.

CW Piscium Radius has been calculated as being 47.18 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 32,828,650.26.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 34.34. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

CW Piscium Apparent and Absolute Magnitudes

CW Piscium has an apparent magnitude of 7.45 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 -1.29 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.60. 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 CW Piscium

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 1.79 which gave the calculated distance to CW Piscium as 1822.14 light years away from Earth or 558.66 parsecs. It would take a spaceship travelling at the speed of light, 1822.14 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 2.45 which put CW Piscium at a distance of 1331.28 light years or 408.16 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.

Variable Type of CW Piscium

The star is a pulsating Semi-Regular Star which are giants or supergiants of intermediate and late spectral 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. CW Piscium brightness ranges from a magnitude of 7.601 to a magnitude of 7.378 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.2 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.

Hide Explanations
Show GridLines

CW Piscium Facts

Visual Facts


Primary / Proper / Traditional NameCW Piscium
Alternative NamesHD 8320, HIP 6453, BD+31 236, CW Psc
Spectral TypeM...
Multiple Star SystemNo / Unknown
Star TypeVariable Star
Colour red
GalaxyMilky Way
ConstellationPisces
Absolute Magnitude-1.29 / -0.60
Visual / Apparent Magnitude7.45
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)01h 22m 56.43
Declination (Dec.)+31° 50` 28.4
Galactic Latitude-30.55 degrees
Galactic Longitude130.70 degrees
1997 Distance from Earth1.79 Parallax (milliarcseconds)
 1822.14 Light Years
 558.66 Parsecs
2007 Distance from Earth2.45 Parallax (milliarcseconds)
 1331.28 Light Years
 408.16 Parsecs
Proper Motion Dec.-9.28 ± 0.60 milliarcseconds/year
Proper Motion RA.5.61 ± 0.86 milliarcseconds/year
B-V Index1.70
Radial Velocity1.09 ± 0.27 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeSemi-Regular Star which are giants or supergiants of intermediate and late spectral
Mean Variability Period in Days0.173
Variable Magnitude Range (Brighter - Dimmer)7.378 - 7.601

Estimated Facts


Calculated Effective Temperature3,456 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


Add a Comment


Name:
Email: (Optional)
Comment: