The Amateur Astronomer

Cover The Amateur Astronomer
The Amateur Astronomer
Gideon Riegler
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In the years from 1828 to 1831 it was too difficult even for this instrument, and trustworthy measures first begin again in 1834. Altogether, since its first discovery, the com- DOUBLE STARS 101 panion star has completed almost four revo- lutions round the principal star, and its period is therefore fairly accurately known. At the present time, when the companion is again very close to the principal, it is a very difficult object. Its distance is somewhat over cr8 second of arc. The apparent ma...gnitude of the principal star is 3*0, its colour yellow; the companion ranks about 6-5 magnitude and is of-^-i ^I'iJsh/ green tint. The period of revolution* ofthjs 3ysie>rn is 33-9 years. ^ . ''', . :, -', '/' Ursae Majoris is also a very difficult object, and can be separated only by the more power- ful instruments. The principal and companion stars are of 5'O and 5-6 magnitude respectively, with a distance between them at present of only O'3 second of arc. 9 Orionis, called the " Trapezium in Orion, " as seen in a 4-inch telescope, consists of four stars, of which the brightest is of 47, the faintest of 8 magnitude.

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