Bedienungsanleitung Bresser 91-18001 National Geographic (Seite 10 von 32) (Deutsch, Englisch, Holländisch, Französisch, Italienisch, Spanisch)

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The famous Ring Nebula (M57) in the Lyra constellation is often viewed as the prototype of a plan-

etary nebula. It is one of the magnificent features of the Northern Hemisphere's summer sky. Recent

studies have shown that it is probably comprised of a ring (torus) of brightly shining material that

surrounds the central star (only visible with larger telescopes), and not a gas structure in the form

of a sphere or an ellipse. If you were to look at the Ring Nebula from the side, it would look like the

Dumbbell Nebula (M 27). When viewed from Earth, we are looking directly at the pole of the nebula.

Constellation Vulpecula (Little Fox):

The Dumbbell Nebula (M 27)

Right Ascension: 19

(hours : minutes) / Declination: +22° 43' (Degrees : minutes)

Distance: 1,360 light years from Earth

The Dumbbell Nebula (M 27) was the first planetary nebula ever discovered. On 12 July 1764,

Charles Messier discovered this new and fascinating class of objects. We see this object almost

directly from its equatorial plane. If we could see the Dumbbell Nebula from one of its poles, we

would probably see the shape of a ring, something very similar to what we know as the Ring Nebula

(M 57). In reasonably good weather, we can see this object well, even with low magnification.

Telescope ABC’s

What do the following terms mean?

Eyepiece (3):

An eyepiece is a system made for your eye and comprised of one or more lenses. An eyepiece captures

and magniﬁ es the clear image that is generated in the focal point of a lens even more.

There is a simple formula for calculating the magniﬁ cation:

Focal width of the telescope tube / Focal width of the eyepiece = Magniﬁ cation

In a telescope, the magniﬁ cation depends on both the focal width of the telescope tube and the focal

width of the eyepiece. From this formula, we see that if you use an eyepiece with a focal width of 20 mm

and a telescope tube with a focal width of 360 mm, you will get the following magniﬁ cation:

360 mm / 20 mm = 18 times magniﬁ cation

Focal width:

Everything that magniﬁ es an object via an optic (lens) has a certain focal width. The focal width is the

length of the path the light travels from the surface of the lens to its focal point. The focal point is also

referred to as the focus. In focus, the image is clear. In the case of a telescope, the focal widths of the

telescope tube and the eyepieces are combined.

Lens:

The lens turns the light which falls on it around so that the light gives a clear image in the focal point after

it has traveled a certain distance (focal width).

Magniﬁ cation:

The magniﬁ cation corresponds to the difference between observation with the naked eye and obser-

vation through a magniﬁ cation apparatus (e.g. a telescope). Observation with the eye is considered

'single', or 1X magniﬁ cation. Accordingly, if a telescope has a magniﬁ cation of 18X, then an object

viewed through the telescope will appear 18 times larger than it would with the naked eye. See also

'Eyepiece'.

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