HIP27473 is the reference name for the star in the Hipparcos Star Catalogue.
YY Columbae has alternative name(s) :- , YY Col.
More details on objects' alternative names can be found at Star Names .
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 YY Columbae, the location is 05h 49m 05.24 and -28° 22` 46.8 .
YY Columbae has a spectral type of K5. This means the star is a orange to red variable star. The star has a B-V Colour Index of 1.63 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 3,689 Kelvin.
YY Columbae Radius has been calculated as being 70.98 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 49,384,955.97.km. If you need the diameter of the star, you just need to multiple the radius by 2. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.
YY Columbae has an apparent magnitude of 8.44 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 -2.46 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.
Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 0.66 which gave the calculated distance to YY Columbae as 4941.87 light years away from Earth or 1515.15 parsecs. It would take a spaceship travelling at the speed of light, 4941.87 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.
The star is a pulsating Semi-Regular Star w 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. YY Columbae brightness ranges from a magnitude of 8.641 to a magnitude of 8.467 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.1 days (variability).
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.
|Primary / Proper / Traditional Name||YY Columbae|
|Alternative Names||HIP 27473, YY Col|
|Constellation's Main Star||No|
|Multiple Star System||No / Unknown|
|Star Type||Variable Star|
|Colour||Orange to Red|
|Visual / Apparent Magnitude||8.44|
|Naked Eye Visible||Requires a 7x50 Binoculars - Magnitudes|
|Right Ascension (R.A.)||05h 49m 05.24|
|Declination (Dec.)||-28° 22` 46.8|
|Galactic Latitude||-25.29 degrees|
|Galactic Longitude||233.34 degrees|
|Distance from Earth||0.66 Parallax (milliarcseconds)|
|4941.87 Light Years|
|312,519,943.52 Astronomical Units|
|Variable Star Class||Pulsating|
|Variable Star Type||Semi-Regular Star w|
|Mean Variability Period in Days||0.134|
|Variable Magnitude Range (Brighter - Dimmer)||8.467 - 8.641|
|Radius (x the Sun)||70.98|
|Effective Temperature||3,689 Kelvin|
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