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 WASP-91, the location is 23h 51m 23.00 and -70° 09` 10.00 .
WASP-91 has a spectral type of K3. This means the star is a orange to red star.
WASP-91 has been calculated as 0.86 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 598,388.00.km. If you need the diameter of the star, you just need to multiple the radius by 2.
The star's metallicity is 0.130000, this value is the fractional amount of the star that is not Hydrogen (X) or Helium (Y). An older star would have a high metallicity whereas a new star would have a lower one.
WASP-91 has an apparent magnitude of 12.00 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. 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.
|Primary / Proper / Traditional Name||WASP-91|
|Constellation's Main Star||No|
|Multiple Star System||No / Unknown|
|Colour||orange to red|
|Visual / Apparent Magnitude||12.00|
|Naked Eye Visible||Requires a 4.5 - 6 Inch Telescope - Magnitudes|
|Right Ascension (R.A.)||23h 51m 23.00|
|Declination (Dec.)||-70° 09` 10.00|
|Radius (x the Sun)||0.86|
|Name||Status||Mass (Jupiters)||Orbital Period (Days)||Eccentricity||Discovered||Semi-Major Axis||Periastron||Inclination|
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