HIP54862 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD97746.
GI Carinae has alternative name(s) :- GI Car, GI Car.
More details on objects' alternative names can be found at Star Names .
The location of the luminous giant 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 GI Carinae, the location is 11h 14m 00.05 and -57° 54` 39.3 .
Based on the star's spectral type of F4II , GI Carinae's colour and type is yellow to white luminous giant star. The star has a B-V Colour Index of 0.72 which means the star's temperature is about 5,603 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.
GI Carinae has an apparent magnitude of 8.32 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.
Using the original Hipparcos data that was released in 1997, the parallax to the star was given as -0.41000 which gave the calculated distance to GI Carinae as -7955.20 light years away from Earth or -2439.02 parsecs. If you want that in miles, it is about -46,765,640,568,750,254.27, based on 1 Ly = 5,878,625,373,183.61 miles.
The star is a pulsating Delta Cepheid 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. GI Carinae brightness ranges from a magnitude of 8.608 to a magnitude of 8.246 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 4.4 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||GI Carinae|
|Alternative Names||GI Car, HD 97746, HIP 54862, GI Car|
|Constellation's Main Star||No|
|Multiple Star System||No / Unknown|
|Star Type||Luminous Giant Star|
|Colour||Yellow - White|
|Visual / Apparent Magnitude||8.32|
|Naked Eye Visible||Requires a 7x50 Binoculars - Magnitudes|
|Right Ascension (R.A.)||11h 14m 00.05|
|Declination (Dec.)||-57° 54` 39.3|
|Galactic Latitude||2.54392236 degrees|
|Galactic Longitude||290.26231783 degrees|
|Distance from Earth||-0.41000 Parallax (milliarcseconds)|
|-7955.20 Light Years|
|-503,080,482.22 Astronomical Units|
|Radial Velocity||-21.40000 ± 3.10 km/s|
|Variable Star Class||Pulsating|
|Variable Star Type||Delta Cepheid|
|Mean Variability Period in Days||4.431|
|Variable Magnitude Range (Brighter - Dimmer)||8.246 - 8.608|
|Effective Temperature||5,603 Kelvin|
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