Page:Gods Glory in the Heavens.djvu/394

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SYNOPTICAL TABLES.
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, 3y. 83d.
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
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