Manual Celestron SkyProdigy 90 - 22091 (page 23 of 32) (English)

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urban areas washes out most nebulae making them dicult, if not

impossible, to observe. Light Pollution Reduction lters help

reduce the background sky brightness, thus increasing contrast.

Seeing Conditions

Viewing conditions aect what you can see through your telescope

during an observing session. Conditions include transparency,

sky illumination and seeing. Understanding viewing conditions

and the eect they have on observing will help you get the most

out of your telescope.

Transparency

Transparency is the clarity of the atmosphere which is aected

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 aect trans-

parency. 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 aect transparency. While

not a problem for the brighter stars and planets, bright skies

reduce the contrast of extended nebulae making them dicult,

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 lters 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 dierent densities

and, therefore, bend light dierently. 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.

Seeing conditions directly aect 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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Celestron SkyProdigy 90 - 22091 Manual

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