Alrischa (arab. "the rope") is the designation of? Piscium (alpha Piscium), main star in the constellation of fish. Alrischa is a close double star with a angle distance of 1,8"between the two components (position angles: 265 degrees) to its dissolution a telescope of at least 10 centimeters of lens aperture to be used should. The main star has a brightness of +3,82 likes and possesses the spectral type A0pSiSr, while the companion likes a brightness of +5,23 has and belongs to the spectral class A3m. Its distance amounts to about 140 light-years (Hipparcos measurement). *Coordinates (equinox 2000)
For example, the five brightest stars in the constellation of Cygnus the Swan (comprising an arrangement also known as the Northern Cross) are approximately 74, 270, 410, 750 and 1600 light-years from the Sun.
Moreover, the dimmest of the quintet, Gienah (Epsilon Cygni), lies nearest to the Sun while the brightest, Deneb (Alpha Cygni), is the most remote.
Were these two stars to exchange places, Deneb, which is intrinsically one of the most luminous stars visible to the naked eye, would outshine Venus in our night sky.
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