Abstract
Comets.—Popular Astronomy for January contains an enlargement (six times) of a photograph of Wilk's comet taken by Prof. G. van Biesbroeck at Yerkes Observatory on Dec. 22. The exposure was for 20 minutes the coma appears exactly circular, 20′ in diameter its brightness is nearly uniform, but there is a slight fading at the edges. A central condensation could be seen visually, but does not appear in the reproduction. It is noted that a slender tail, pointing almost exactly opposite to the direction of the sun, can be traced through 20′ on the negative. Prof, van Biesbroeck also gives reproductions of the two plates taken by M. Quénisset in Switzerland of Forbes's first comet on Oct. 25, 1928, nearly a month before its discovery. Prof, van Biesbroeck has measured the enlargement of the first plate, and gives the following position of the comet, which he estimates to be trustworthy within 5″. 1928 Oct. 25. 1542 U.T., R.A. 10h 56m 54.5s, N. Decl. 11° 32′ 3″(equinox 1928.0).
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