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W Crateris, HIP55825

Primary Facts on W Crateris

  • W Crateris's star type is pulsating variable star that can be located in the constellation of Crater. The description is based on the spectral class.
  • W Crateris is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (A9.5:) of the star, the star's colour is blue .
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • The star is calculated at being about -12080.12 light years away from us.

W Crateris's Alternative Names

HIP55825 is the reference name for the star in the Hipparcos Star Catalogue.

W Crateris has alternative name(s) :- , W Crt.

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

Location of W Crateris

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 W Crateris, the location is 11h 26m 29.66 and -17° 54` 51.6 .

Physical Properties (Colour) of W Crateris

W Crateris has a spectral type of A9.5:. This means the star is a blue variable star. The star's Iron Abundance is -0.54 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

W Crateris Apparent and Absolute Magnitudes

W Crateris has an apparent magnitude of 11.78 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. Using the supplied Parallax value, you would get an absolute magnitude of 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 W Crateris

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as -0.27 which gave the calculated distance to W Crateris as -12080.12 light years away from Earth or -3703.70 parsecs. It would take a spaceship travelling at the speed of light, -12080.12 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

Variable Type of W Crateris

The star is a pulsating RR Lyrae type with a 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. W Crateris brightness ranges from a magnitude of 12.256 to a magnitude of 10.844 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.4 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 W Crateris Facts and Figures

Visual Facts

Primary / Proper / Traditional NameW Crateris
Alternative NamesHIP 55825, W Crt
Spectral TypeA9.5:
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
Colour blue
GalaxyMilky Way
Visual / Apparent Magnitude11.78
Naked Eye VisibleRequires a 4.5 - 6 Inch Telescope - Magnitudes
Right Ascension (R.A.)11h 26m 29.66
Declination (Dec.)-17° 54` 51.6
Galactic Latitude40.47 degrees
Galactic Longitude275.99 degrees
Distance from Earth-0.27 Parallax (milliarcseconds)
 -12080.12 Light Years
 -3703.70 Parsecs
 -763,937,639.71 Astronomical Units
B-V Index-99.00
Radial Velocity70.00 ± 3.70 km/s
Iron Abundance-0.54 ± 9.99 Fe/H

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Variable Star Details

Variable Star ClassPulsating
Variable Star TypeRR Lyrae type with a
Mean Variability Period in Days0.412
Variable Magnitude Range (Brighter - Dimmer)10.844 - 12.256

Sources and Links

SIMBAD SourceLink

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