Manual Celestron CPC Deluxe 800 HD - 11007 (page 26 of 50) (English)

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Seeing conditions refers to the stability of the atmosphere and directly

aects the amount of ne 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, ne 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.

>>

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.

>>

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 transparency. Ideal conditions are when the night sky

is inky black.

>>

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.

>>

Deep-sky objects are simply those objects outside the boundaries of

our solar system. They include star clusters, planetary nebulae, diuse

nebulae, double stars and other galaxies outside our own Milky Way.

Most deep-sky objects have a large angular size. Therefore, low-to-

moderate power is all you need to see them. Visually, they are too faint

to reveal any of the color seen in long exposure photographs. Instead,

they appear black and white. And, because of their low surface brightness,

they should be observed from a dark-sky location. Light pollution around

large 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.

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Celestron CPC Deluxe 800 HD - 11007 Manual

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