Handleiding Meade ETX-105AT (pagina 58 van 60) (Engels)

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Fig. 56: The Pleiades is

one of the most beautiful

open clusters.

Tip:

Enter a date in the Date

menu and you can

determine if a planet(s)—

or any other object in the

database—will be visible

during the night of the

entered date.

After entering a new date,

go to the Object menu

and select the desired

planet from the menu.

Then keep pressing one

of the Scroll keys until the

rise and set times display.

Press MODE to exit.

Planets

Planets change positions in the sky as they orbit around the Sun. To locate the

planets on a given day or month, consult a monthly astronomy magazine, such as Sky

and Telescope or Astronomy. Listed below are the best planets for viewing through

your ETX model telescope.

Venus is about nine-tenths the diameter of Earth. As Venus orbits the Sun, observers

can see it go through phases (crescent, half and full) much like those of the Moon.

The disk of Venus appears white, as sunlight is reflected off the thick cloud cover that

completely obscures any surface detail.

Mars is about half the diameter of Earth. Through the telescope it appears as a tiny

reddish-orange disk. You may see a hint of white at one of the planet’s polar ice caps.

Approximately every two years, when Mars is closest to Earth, additional detail and

coloring on the planet's surface may be visible.

Jupiter (Fig. 54) is the largest planet in our solar system, with a diameter 11 times

that of Earth. Jupiter appears as a disk with dark lines stretching across the surface.

These lines are cloud bands in the atmosphere. Four of Jupiter’s 29 (and still

counting!) moons (Io, Europa, Ganymede and Callisto) can be seen as star-like points

of light when you use even the lowest magnification. The number of moons

visible on any given night changes as they circle around the giant planet.

Saturn (Fig. 55) is nine times the diameter of Earth and appears as a small, round

disk with rings extending out from either side. In 1610, Galileo, the first person to

observe Saturn through a telescope, did not understand that what he was seeing were

rings. Instead, he believed that Saturn had “ears.” Saturn’s rings are composed of

billions of ice particles. The major division in Saturn's rings, called the Cassini

Division, is generally visible through all three ETX models. Titan, the largest of

Saturn’s moons, can also be seen as a bright, star-like object near the planet.

Deep-Sky Objects

You can use star charts to locate constellations, individual stars and deep-sky objects.

Examples of various deep-sky objects are given below:

Stars are large gaseous objects that are illuminated by nuclear fusion in their core.

Because of their vast distances from our solar system, all stars appear as pinpoints of

light, regardless of the size of the telescope used.

Nebulae are vast interstellar clouds of gas and dust where stars are formed. Most

impressive of these is the Great Nebula in Orion (M42), a diffuse nebula that appears

as a faint wispy gray cloud. M42 is 1600 light years from Earth.

Open Clusters are loose groupings of young stars, all recently formed from the same

diffuse nebula. The Pleiades (Fig. 56) is an open cluster 410 light years from Earth.

Several hundred stars of the cluster are visible through your telescope.

Constellations are large, imaginary patterns of stars believed by ancient civilizations

to be the celestial equivalent of objects, animals, people or gods. These patterns are

too large to be seen through a telescope. To learn the constellations, start with an

easy grouping of stars, such as the Big Dipper in Ursa Major. Then use a star chart to

explore across the sky.

Galaxies are large assemblies of stars, nebulae and star clusters that are bound by

gravity. The most common shape is spiral (such as our own Milky Way), but galaxies

can also be elliptical or even irregular blobs. The Andromeda Galaxy (M31) is the clos-

est spiral-type galaxy to our own. This galaxy appears fuzzy and cigar-shaped. It is

2.2 million light years away in the constellation Andromeda.

Fig. 55: Saturn has the

most extensive ring struc-

ture in our Solar System.

Fig. 54: The planet Jupiter.

Jupiter's four largest

moons can be observed in

a different position every

night.

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