Bedienungsanleitung Celestron 21035 - Travel Scope 70 (Seite 16 von 100) (Deutsch, Englisch, Französisch, Italienisch, Spanisch)

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16 I ENGLISH

SEEING CONDITIONS

Viewing conditions affect what you can see through your telescope during an observing session. Conditions include

transparency, sky illumination, and seeing. Understanding viewing conditions and the effect they have on observing will help

you get the most out of your telescope.

Transparency

Transparency is the clarity of the atmosphere which is affected by clouds, moisture, and other airborne particles. Thick cumulus

clouds are completely opaque while cirrus can be thin, allowing the light from the brightest stars through. Hazy skies absorb more

light than clear skies making fainter objects harder to see and reducing contrast on brighter objects. Aerosols ejected into the

upper atmosphere from volcanic eruptions also affect transparency. Ideal conditions are when the night sky is inky black.

Sky Illumination

General sky brightening caused by the Moon, aurorae, natural airglow, and light pollution greatly affect transparency. While not

a problem for the brighter stars and planets, bright skies reduce the contrast of extended nebulae making them difﬁcult, if not

impossible to see. To maximize your observing, limit deep sky viewing to moonless nights far from the light polluted skies found

around major urban areas. LPR ﬁlters enhance deep sky viewing from light polluted areas by blocking unwanted light while

transmitting light from certain deep sky objects. You can, on the other hand, observe planets and stars from light polluted areas

or when the Moon is out.

Seeing

Seeing conditions refers to the stability of the atmosphere and directly affects the amount of ﬁne detail seen in extended

objects. The air in our atmosphere acts as a lens which bends and distorts incoming light rays. The amount of bending depends

on air density. Varying temperature layers have different densities and, therefore, bend light differently. Light rays from the same

object arrive slightly displaced creating an imperfect or smeared image. These atmospheric disturbances vary from time-to-time

and place-to-place. The size of the air parcels compared to your aperture determines the “seeing” quality. Under good seeing

conditions, ﬁne detail is visible on the brighter planets like Jupiter and Mars, and stars are pinpoint images. Under poor seeing

conditions, images are blurred and stars appear as blobs.

The conditions described here apply to both visual and photographic observations.

Fig. 18

Seeing conditions directly affect image quality. These drawings represent a point source (i.e., star) under bad

seeing conditions (left) to excellent conditions (right). Most often, seeing conditions produce images that lie

some where between these two extremes.

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