Most of the brighter naked eye stars are at distances of a few tens to hundreds on light years from Earth. The brightest or apparent magnitude of each star in the night time sky is determined by the star's intrinsic luminosity, and by its distance from us. Mirfak is a yellow-white supergiant lying approximately 590 light-years from Earth. Vega, (α Lyrae) is such a star. Stars hotter than Vega will have a negative colour index and appear more bluish. One of the most recognized and brightest stars, Mirfak, shines at mag 1.82 and is perhaps second only to Algol as far as Perseus is concerned. The intrinsic luminosity of the stars varies from less than 1/1000 of the Sun's luminosity to over a million times greater. The calibration of the colour index scale means that a star of spectral class A0 and luminosity class V (ie a main sequence star) has a colour index of 0.0. Almach (AL-mak) Andromeda: One of the most beautiful double stars, having yellow-orange and blue-green components. Its luminosity changes between 1 and 10,000 times the brightness of the sun. It has a luminosity 4995 times that of the Sun and is approximately 592 light-years away. Miram - η Persei (eta Persei) is circumpolar and transits at 17:14 UTC (altitude: 85.6°). 'A yellow supergiant F star, Mirfak is important in that it lies just at the edge of the properties of Cepheid variables, and thus is instrumental in defining the nature of such stars (and may be a very modest pulsator itself). Mirfak (Alpha Persei) is the brightest star in the constellation Perseus; its name comes from a long Arabic phrase that means 'the elbow of the Pleiades. The brightest star in the … It's about 5000 times more luminescent than Earth's sun, which is a yellow dwarf in the G2V classification. The area of sky represented in the image is 0.5x0.5 degrees (30x30 arcmins). Procyon / ˈ p r oʊ s i ɒ n / is the brightest star in the constellation of Canis Minor and usually the eighth-brightest star in the night sky, with a visual apparent magnitude of 0.34. Mirfak (MIR-fak) Perseus: The brightest star in Perseus is in the center of a beautiful field of stars as seen in binoculars. Mirfak shares a constellation with a more famous star, Algol. Mirfak has about 8.5[2] times the Sun's mass and has expanded to roughly 60[6] times the size of the Sun. It is radiating 7,000[10] times as much luminosity as the Sun from its outer atmosphere at an effective temperature of 6,350 K,[2] which creates the yellow-white glow of an F-type star . The brightest star in Perseus is [6453] ~, also known by its traditional names Mirfak ("elbow") and Algenib ("the side"). The image below is a photograph of Miram from the Digitized Sky Survey 2 (DSS2 - see the credits section) taken in the red channel. Mirfak has a spectral class* of F5 Ib, making it a yellow-white supergiant in the latter stages of its evolution. * Spectral Classification is used to characterize stars based on their surface temperature, as determined from Wien's… Also known as the “Demon Star,” Algol is an eclipsing binary star and one of the most prominent of its kind in our sky. We calculate infrared to stellar bolometric luminosity ratiosfor all stars exhibiting mid-infrared excesses and infer the total massof orbiting dust in the cases of optically thin disks. Despite Algol’s clockwork changes in brightness, Mirfak is easier to find; thus the latter is often used as a reference point to locate the former. Digitized Sky Survey image of Miram. Its luminosity is 5,000 that of the Sun.

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