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|+FIXED STARS. |- ||Magnitude of the smallest stars visible, ||7th |- ||Magnitude of the— — — stars visible by the most powerful telescopes, ||16th |- ||Light of a star of the 6th magnitude (1st magnitude = 1), ||1-1OOth |- ||Number of stars of 1st magnitude, ||24 |- ||Number of stars of 1st magnitude,— — — 2d magnitude, ||50-60 |- ||Number of stars of 1st magnitude,— — — 3d magnitude, ||200 |- ||Number of stars— — — total registered to 7th magnitude, about ||15,000 |- ||Number of stars— — — total visible in Herschel's 20-feet telescope, ||5,500,000 |- ||Rate at which light travels per second, in miles, ||200,000 |- ||Time required by light to traverse the distance of a star with one second of parallax, in years, ||3^y. 83^d. |- ||Corresponding distance in billions of miles, ||20 |- ||Distance of smallest stars seen in telescopes of 75 space penetrating power, measured by light in years, ||2,000 |- ||Star 61 Cygni, parallax first detected in it, by Bessel, ||0″.349 |- ||Star 61 Cygni,— — — proper motion annually, ||5″ |- ||Star 61 Cygni,— — — distance of component stars, ||15″ |- ||Star 61 Cygni,— — — sum of masses of the component stars (Sun = 1), ||0.353 |- ||α Centauri, parallax, ||0″.9128 |- ||α Centauri,— — — nearest star, distance measured by light, in years, about ||3.5 |- ||α Centauri,— — — proper motion, ||4″ |- ||Number of stars to which parallax has been assigned, ||9 |- ||Probable average distance of stars of 1st magnitude, measured by light, in years, ||15.5 |- ||Probable average distance of stars of— — — 2d magnitude, ||28 |- ||Probable average distance of stars of— — — 3d magnitude, ||43 |- ||Probable average distance of stars of— — — 4th magnitude, ||60 |- ||Probable average distance of stars of— — — 5th magnitude, ||84 |}