358
SYNOPTICAL TABLES.
{|style="width:100%;"
|+FIXED STARS. |- |style="vertical-align:top;"|Magnitude of the smallest stars visible, |style="vertical-align:bottom;text-align:right;"|7th |- |style="vertical-align:top;"|Magnitude of the stars visible by the most powerful telescopes, |style="vertical-align:bottom;text-align:right;"|16th |- |style="vertical-align:top;"|Light of a star of the 6th magnitude (1st magnitude = 1), |style="vertical-align:bottom;text-align:right;"|1-1OOth |- |style="vertical-align:top;"|Number of stars of 1st magnitude, |style="vertical-align:bottom;text-align:right;"|24 |- |style="vertical-align:top;"|Number of stars of 1st magnitude, 2d magnitude, |style="vertical-align:bottom;text-align:right;"|50-60 |- |style="vertical-align:top;"|Number of stars of 1st magnitude, 3d magnitude, |style="vertical-align:bottom;text-align:right;"|200 |- |style="vertical-align:top;"|Number of stars total registered to 7th magnitude, about |style="vertical-align:bottom;text-align:right;"|15,000 |- |style="vertical-align:top;"|Number of stars total visible in Herschel's 20-feet telescope, |style="vertical-align:bottom;text-align:right;"|5,500,000 |- |style="vertical-align:top;"|Rate at which light travels per second, in miles, |style="vertical-align:bottom;text-align:right;"|200,000 |- |style="vertical-align:top;"|Time required by light to traverse the distance of a star with one second of parallax, in years, |style="vertical-align:bottom;text-align:right;"|3y. 83d. |- |style="vertical-align:top;"|Corresponding distance in billions of miles, |style="vertical-align:bottom;text-align:right;"|20 |- |style="vertical-align:top;"|Distance of smallest stars seen in telescopes of 75 space penetrating power, measured by light in years, |style="vertical-align:bottom;text-align:right;"|2,000 |- |vtp|Star 61 Cygni, parallax first detected in it, by Bessel, |style="vertical-align:bottom;text-align:right;"|0″.349 |- |style="vertical-align:top;"|Star 61 Cygni, proper motion annually, |style="vertical-align:bottom;text-align:right;"|5″ |- |style="vertical-align:top;"|Star 61 Cygni, distance of component stars, |style="vertical-align:bottom;text-align:right;"|15″ |- |style="vertical-align:top;"|Star 61 Cygni, sum of masses of the component stars (Sun = 1), |style="vertical-align:bottom;text-align:right;"|0.353 |- |style="vertical-align:top;"|α Centauri, parallax, |style="vertical-align:bottom;text-align:right;"|0″.9128 |- |style="vertical-align:top;"|α Centauri, nearest star, distance measured by light, in years, about |style="vertical-align:bottom;text-align:right;"|3.5 |- |style="vertical-align:top;"|α Centauri, proper motion, |style="vertical-align:bottom;text-align:right;"|4″ |- |style="vertical-align:top;"|Number of stars to which parallax has been assigned, |style="vertical-align:bottom;text-align:right;"|9 |- |style="vertical-align:top;"|Probable average distance of stars of 1st magnitude, measured by light, in years, |style="vertical-align:bottom;text-align:right;"|15.5 |- |style="vertical-align:top;"|Probable average distance of stars of 2d magnitude, |style="vertical-align:bottom;text-align:right;"|28 |- |style="vertical-align:top;"|Probable average distance of stars of 3d magnitude, |style="vertical-align:bottom;text-align:right;"|43 |- |style="vertical-align:top;"|Probable average distance of stars of 4th magnitude, |style="vertical-align:bottom;text-align:right;"|60 |- |style="vertical-align:top;"|Probable average distance of stars of 5th magnitude, |style="vertical-align:bottom;text-align:right;"|84 |}