Astronomy with an Opera-glass: A Popular Introduction to the Study of the Starry Heavens with the Simplest of Optical InstrumentsServiss, Garrett Putman
Science
Astronomy with an Opera-glass: A Popular Introduction to the Study of the Starry Heavens with the Simplest of Optical Instruments
Serviss, Garrett Putman
Astronomy
We will pause but briefly with Cepheus, for the old king's constellation
is comparatively dim in the heavens, as his part in the dramatic story
of Andromeda was contemptible, and he seems to have got among the stars
only by virtue of his relationship to more interesting persons. He does
possess one gem of singular beauty--the star Mu, which may be found
about two and a half degrees south of the star Nu ([nu]). It is the
so-called "Garnet Star," thus named by William Herschel, who advises the
observer, in order to appreciate its color, to glance from it to Alpha
Cephei, which is a white star. Mu is variable, changing from the fourth
to the sixth magnitude in a long period of five or six years. Its color
is changeable, like its light. Sometimes it is of a deep garnet hue, and
at other times it is orange-colored. Upon the whole, it appears of a
deeper red than any other star visible to the naked eye.
If you have a good field-glass, try its powers upon the star Delta
([delta]) Cephei. This is a double star, the components being about
forty-one seconds of arc apart, the larger of four and one half
magnitude, and the smaller of the seventh magnitude. The latter is of a
beautiful blue color, while the larger star is yellow or orange. With a
good eye, a steady hand, and a clear glass, magnifying not less than six
diameters, you can separate them, and catch the contrasted tints of
their light. Besides being a double star, Delta is variable.
CHAPTER IV.
THE STARS OF WINTER.
I have never beheld the first indications of the rising of Orion without
a peculiar feeling of awakened expectation, like that of one who sees
the curtain rise upon a drama of absorbing interest. And certainly the
magnificent company of the winter constellations, of which Orion is the
chief, make their entrance upon the scene in a manner that may be
described as almost dramatic. First in the east come the world-renowned
Pleiades. At about the same time Capella, one of the most beautiful of
stars, is seen flashing above the northeastern horizon. These are the
sparkling ushers to the coming spectacle. In an hour the fiery gleam of
Aldebaran appears at the edge of the dome below the Pleiades, a star
noticeable among a thousand for its color alone, besides being one of
the brightest of the heavenly host. The observer familiar with the
constellations knows, when he sees this red star which marks the eye of
the angry bull, Taurus, that just behind the horizon stands Orion with
starry shield and upraised club to meet the charge of his gigantic
enemy. With Aldebaran rises the beautiful V-shaped group of the Hyades.
Presently the star-streams of Eridanus begin to appear in the east and
southeast, the immediate precursors of the rising of Orion:
"And now the river-flood's first winding reach
The becalmed mariner may see in heaven,
As he watches for Orion to espy if he hath aught to say
Of the night's measure or the slumbering winds."
Public-domain text, read in full here on John Shaqi.
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