HIP74915 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD135748.
More details on objects' alternative names can be found at Star Names .
The location of the main sequence 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 HD135748, the location is 15h 18m 33.80 and -47° 52` 44.9 .
HD135748 has a spectral type of A2/A3V:. This means the star is a blue main sequence star. The star is 7,327.00 Parsecs from the Galactic Centre or in terms of Light Years is 23,897.99 s. The star has a B-V Colour Index of 0.09 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 8,538 Kelvin.
HD135748 Radius has been calculated as being 1.61 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,118,548.23.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.
HD135748 has an apparent magnitude of 6.87 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 2.12 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 11.22 which gave the calculated distance to HD135748 as 290.70 light years away from Earth or 89.13 parsecs. It would take a spaceship travelling at the speed of light, 290.70 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.
The star's Galacto-Centric Distance is 7,327.00 Parsecs or 23,897.99 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.
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||HD135748|
|Alternative Names||HD 135748, HIP 74915|
|Constellation's Main Star||No|
|Multiple Star System||Yes|
|Star Type||main sequence Dwarf Star|
|Visual / Apparent Magnitude||6.87|
|Naked Eye Visible||Requires a 7x50 Binoculars - Magnitudes|
|Right Ascension (R.A.)||15h 18m 33.80|
|Declination (Dec.)||-47° 52` 44.9|
|Galactic Latitude||8.04 degrees|
|Galactic Longitude||326.86 degrees|
|Distance from Earth||11.22 Parallax (milliarcseconds)|
|290.70 Light Years|
|18,384,254.08 Astronomical Units|
|Galacto-Centric Distance||23,897.99 Light Years / 7,327.00 Parsecs|
|Radius (x the Sun)||1.61|
|Effective Temperature||8,538 Kelvin|
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