File:The elements of astronomy; a textbook (1919) (14779111001).jpg

Identifier: elementsofastro00youn (find matches)
Title: The elements of astronomy; a textbook
Year: 1919 (1910s)
Authors: Young, Charles A. (Charles Augustus), 1834-1908 Young, Anne Sewell, b. 1871., ed
Subjects: Astronomy Constellations
Publisher: Boston, New York (etc.) Ginn and Company
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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nsiblyparabolic. 398. Telescopic Features.—Early in October, the comet pre-sented the ordinary features. The nucleus was round, a number ofwell-marked envelopes were visible in the head, and the dark stripedown the centre of the tail was sharply defined. Two weeks later,the nucleus had been broken up and transformed into a crooked 286 THE COMET OF 1882. (§398 stream, some 50,000 miles in length, of five or six bright points; theenvelopes had vanished from the head, and the dark stripe was re-placed by a bright central spine. At the time of perihelion the comets spectrum was filled withcountless bright lines. Those of sodium were easily recognizable, andcontinued visible for several weeks ; the other lines disappeared muchmore quickly, and were not certainly identified, although the generalaspect of the spectrum indicated that iron, manganese, and calciumwere probably present. By the middle of October it had becomesimply the normal comet spectrum, with the ordinary hydrocarbonbands.
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Fig. 100. —The Sheath, and the Attendants of the Comet of 1882. 399. The Tail. — The comet was so situated that the tail wasdirected nearly away from the earth, and so was not seen to goodadvantage, never having an apparent length exceeding 35°. Theactual length, however, at one time was more than 100,000000 miles. §399) METEORS AND SHOOTING STARS. 287 A unique, and so far unexplained, phenomenon was a faint, straight-edged sheath of light that enveloped the portions of the comet nearthe head, and projected 3° or 4° in front of it, as shown in Fig. 100.Moreover, there were certain shreds of cometary matter accompanyingthe comet at a distance of 3° or 4° when first seen, but gradually re-ceding and growing fainter. This also was something new in comet-ary history, though Brookss Comet of 1889 (next to be mentioned)has since then done the same thing. 399*. Brookss Comet 1889. V. (for a time known as theLexell-Brooks Comet). Comet 1889. V was a small one dis-covered by Brooks i

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