Pleasures of the telescope: An Illustrated Guide for Amateur Astronomers and a Popular Description of the Chief Wonders of the Heavens for General ReadersServiss, Garrett Putman
Science
Pleasures of the telescope: An Illustrated Guide for Amateur Astronomers and a Popular Description of the Chief Wonders of the Heavens for General Readers
The inconspicuous Lynx furnishes some fine telescopic objects, all
grouped near the northwestern corner of the constellation. Without a
six-inch telescope it would be a waste of time to attack the double star
4, whose components are of sixth and eighth magnitudes, distance 0.8",
p. 103 deg.; but its neighbor, 5, a fine triple, is within our reach, the
magnitudes being six, ten, and eight, distances 30", p. 139 deg., and 96",
p. 272 deg.. In 12 Lyncis we find one of the most attractive of triple
stars, which in good seeing weather is not beyond the powers of a
three-inch glass, although we shall have a far more satisfactory view of
it with the four-inch. The components are of the sixth, seventh, and
eighth magnitudes, distances 1.4", p. 117 deg., and 8.7", p. 304 deg.. A
magnifying power which just suffices clearly to separate the disks of
the two nearer stars makes this a fine sight. A beautiful contrast of
colors belongs to the double star 14, but unfortunately the star is at
present very close, the distance between its sixth and seventh magnitude
components not exceeding 0.8", position angle 64 deg.. Sigma 958 is a pretty
double, both stars being of the sixth magnitude, distance 5", p. 257 deg..
Still finer is Sigma 1009, a double, whose stars are both a little above
the seventh magnitude and nearly equal, distance 3", p. 156 deg.. A low
power suffices to show the three stars in 19, their magnitudes being six
and a half, seven and a half, and eight, distances 15", p. 312 deg., and
215", p. 358 deg.. Webb describes the two smaller stars as plum-colored.
Plum-colored suns!
At the opposite end of the constellation are two fine doubles, Sigma
1333, magnitudes six and a half and seven, distance 1.4", p. 39 deg.; and
38, magnitudes four and seven, distance 2.9", p. 235 deg..
Under the guidance of map No. 6 we turn to Leo, which contains one of
the leading gems among the double stars, gamma, whose components, of the
second and fourth magnitudes, are respectively yellow and green, the
green star, according to some observers, having a peculiar tinge of red.
Their distance apart is 3.7", p. 118 deg., and they are undoubtedly in
revolution about a common center, the probable period being about four
hundred years. The three-inch glass should separate them easily when the
air is steady, and a pleasing sight they are.
The star iota is a closer double, and also very pretty, magnitudes four
and eight, colors lemon and light blue, distance 2.17", p. 53 deg.. Other
doubles are tau, magnitudes five and seven, distance 95", p. 170 deg.; 88,
magnitudes seven and nine, distance 15", p. 320 deg.; 90, triple, magnitudes
six, seven and a half, and ten, distance, 3.5", p. 209 deg., and 59", p.
234 deg.; 54, magnitudes four and a half and seven, distance 6.2", p. 102 deg.;
and 49, magnitudes six and nine, distance 2.4", p. 158 deg..
Public-domain text, read in full here on John Shaqi.
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