Popular Astronomy, Volume 57Goodsell Observatory of Carleton College, 1949 |
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Page 214
... MESSIER 13 Color - Class Photovisual b0 to b5 to a0 to a5 to f0 to f5 to go to g5 to k0 to k5 to All Magnitude b5 a0 a5 fo f5 g0 g5 11.80 - .99 12.00 - .19 k0 k5 1 .20 - .39 .40 - .59 .60 - .79 11 .80 - .99 13.00 - .19 1 .20 - .39 40 ...
... MESSIER 13 Color - Class Photovisual b0 to b5 to a0 to a5 to f0 to f5 to go to g5 to k0 to k5 to All Magnitude b5 a0 a5 fo f5 g0 g5 11.80 - .99 12.00 - .19 k0 k5 1 .20 - .39 .40 - .59 .60 - .79 11 .80 - .99 13.00 - .19 1 .20 - .39 40 ...
Page 221
... Messier 3 and Messier 5 have relatively few sub - class c stars , and the average length of period for their vari- ables is 15 % less than for the other clusters : w Centauri Messier 15 Messier 53 Messier 5 Messier 3 -c - type ...
... Messier 3 and Messier 5 have relatively few sub - class c stars , and the average length of period for their vari- ables is 15 % less than for the other clusters : w Centauri Messier 15 Messier 53 Messier 5 Messier 3 -c - type ...
Page 224
... Messier 4 and Messier 22 , may give the earliest positive results . Messier 13 , for which the star positions have been carefully measured , is perhaps five times as difficult . The word globular naturally suggests sphericity , but most ...
... Messier 4 and Messier 22 , may give the earliest positive results . Messier 13 , for which the star positions have been carefully measured , is perhaps five times as difficult . The word globular naturally suggests sphericity , but most ...
Contents
INDEX TO ILLUSTRATIONS | 48 |
Astrolabes Photographs of 159 160 | 159 |
e Orbit of 464 | 178 |
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American angle appear asteroid astrolabe Astronomical Society atmosphere atomic average bright brighter California Cepheids cloud color comets crater curves determined diameter distance earth eclipse enstatite Ephemeris fireball galactic galaxy globular clusters Harvard Harvard College Observatory heliometer indicated instrument interest July June Jupiter latitude Lick Observatory light lunar magnitude Mars mass maximum mean measured meridian Messier meteor meteorites Meteoritical Society method miles Milky mirror month moon motion nebulae Notes novae object observations Observatory OCCULTATIONS VISIBLE October Open cluster optical orbit origin Palomar Palomar Observatories paper parallax particles period photographic planetary planetary nebulae planets plates POPULAR ASTRONOMY present probably published radiation radio relative rocket rotation Russell Santa Rosa Saturn scientific solar system space spectra spectrum stellar Struve Sunspot Table telescope temperature theory tion University Uranus Variable Star velocity Venus Yerkes Observatory