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Updated: May 21, 2025
The wash of the light-waves in the atmosphere provokes many expressions of impatience from the astronomer, but it is often a beautiful phenomenon nevertheless. Between eta and delta is a fifth-magnitude double star, Sigma 725, which is worth a moment's attention. The primary, of a reddish color, has a very faint star, eleventh magnitude, at a distance of 12.7", p. 88°.
In 8 we find a golden fifth-magnitude star, combined with a blue or lilac star of the seventh magnitude, distance 14", p. 24°. Sigma 938 is a difficult double, magnitudes six and a half and twelve, distance 10", p. 210°. Sigma 921 is double, magnitudes six and a half and eight, distance 16", p. 4°. At the spot marked on the map 1424 we find an interesting cluster containing one star of the sixth magnitude.
The magnitudes are three and ten, distance 10", p. 357°. In the double star 23 the magnitudes are four and nine, distance 23", p. 272°. A more pleasing object is sigma^2, a greenish fifth-magnitude star which has an eighth-magnitude companion, distance 2.6", p. 245°. A good double for our four-inch glass is xi, whose magnitudes are four and five, distance 1.87", p. 183°. This is a binary with a period of revolution of about sixty years, and is interesting as the first binary star whose orbit was determined.
The magnitudes are six and nine; distance, 3.5", p. 233°. Colors yellow and blue. Sigma 1846 is a fifth-magnitude star with a tenth-magnitude companion, distance only 4", p. 108°. Use the five-inch. And now we approach something that is truly marvelous, the "Field of the Nebulæ."
"How far?" asked Jones. "It's fifth magnitude," said the pilot happily. "We really did pile on the horses!" Jones looked momentarily pleased again. Cochrane said in a voice that even to himself sounded outraged: "You mean the sun's a fifth-magnitude star from here? What the devil happened?" "Booster," said Jones, nearly with enthusiasm.
But M. Paul Stroobant, who in 1887 submitted all the available data on the subject to a searching examination, identified Horrebow's satellite with Theta Libræ, a fifth-magnitude star; and a few other apparitions were, by his industry, similarly explained away. Nevertheless, several withstood all efforts to account for them, and together form a most curious case of illusion.
In the Antarctic, conditions for observing occultation are rather favourable during the winter, since, fifth-magnitude stars can be seen with a small telescope at any time during the twenty-four hours if the sky is clear, and the moon is also often above the horizon for a large fraction of the time.
Period, three hundred and seventy-six days. The star alpha has a fifth-magnitude companion, distant about 230", which can be easily seen with an opera glass. At the point marked A on the map is a curious multiple star, sometimes referred to by its number in Piazzi's catalogues as follows: 212 P. xiv.
M. Paul Henry estimated the star's brightness on December 2 as equal only to that of a fifth-magnitude star.
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