Half-hours with the Telescope: Being a Popular Guide to the Use of the Telescope as a Means of Amusement and Instruction.Proctor, Richard A. (Richard Anthony)
Science
Half-hours with the Telescope: Being a Popular Guide to the Use of the Telescope as a Means of Amusement and Instruction.
Proctor, Richard A. (Richard Anthony)
Astronomy; Telescopes
Above the nebula is the star [sigma], a multiple star. To an observer
with a good 3-1/2-inch glass [sigma] appears as an octuple star. It is
well seen, however, as a fine multiple star with a smaller aperture.
Some of the stars of this group appear to be variable.
The star [rho] Orionis is an unequal, easy double, the components being
separated by nearly seven seconds. The primary is orange, the smaller
star smalt-blue (see Plate 3).
The middle star of the belt ([epsilon]) has a distant blue companion.
This star, like [iota], is nebulous. In fact, the whole region within
the triangle formed by stars [gamma], [kappa] and [beta] is full of
nebulous double and multiple stars, whose aggregation in this region I
do not consider wholly accidental.
We have not explored half the wealth of Orion, but leave much for future
observation. We must turn, however, to other constellations.
Below Orion is Lepus, the Hare, a small constellation containing some
remarkable doubles. Among these we may note [xi], a white star with a
scarlet companion; [gamma], a yellow and garnet double; and [iota], a
double star, white and pale violet, with a distant red companion. The
star [kappa] Leporis is a rather close double, white with a small green
companion. The intensely red star R Leporis (a variable) will be found
in the position indicated in the map.
Still keeping within the boundary of our map, we may next turn to the
fine cluster 2 H (vii.) in Monoceros. This cluster is visible to the
naked eye, and will be easily found. The nebula 2 H (iv.) is a
remarkable one with a powerful telescope.
The star 11 Monocerotis is a fine triple star described by the elder
Herschel as one of the finest sights in the heavens. Our observer,
however, will see it as a double (see Plate 3). [delta] Monocerotis is
an easy double, yellow and lavender.
We may now leave the region covered by the map and take a survey of the
heavens for some objects well seen at this season.
Towards the south-east, high up above the horizon, we see the twin-stars
Castor and Pollux. The upper is Castor, the finest double star visible
in the northern heavens. The components are nearly equal and rather more
than 5" apart (see Plate 3). Both are white according to the best
observers, but the smaller is thought by some to be slightly greenish.
Pollux is a coarse but fine triple star (in large instruments multiple).
The components orange, grey, and lilac.
There are many other fine objects in Gemini, but we pass to Cancer.
The fine cluster Praesepe in Cancer may easily be found as it is
distinctly visible to the naked eye in the position shown in Plate 1,
Map I. In the telescope it is seen as shown in Plate 3.
The star [iota] Cancri is a wide double, the colours orange and blue.
Procyon, the first-magnitude star between Praesepe and Sirius, is finely
coloured--yellow with a distant orange companion, which appears to be
variable.
Public-domain text, read in full here on John Shaqi.
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