Celestron CPC DELUXE 1100 HD, Instruction Manual

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Seeing conditions refers to the stability of the atmosphere and directly
ƒơ‡ –•–Š‡ƒ‘—–‘ˆƤ‡†‡–ƒ‹Ž•‡‡‹‡š–‡†‡†‘„Œ‡ –•ǤŠ‡ƒ‹”‹‘—”
atmosphere acts as a lens which bends and distorts incoming light rays.
The amount of bending depends on air density. Varying temperature
Žƒ›‡”•Šƒ˜‡†‹ơ‡”‡–†‡•‹–‹‡•ƒ†ǡ–Š‡”‡ˆ‘”‡ǡ„‡†Ž‹‰Š–†‹ơ‡”‡–Ž›Ǥ
‹‰Š–”ƒ›•ˆ”‘–Š‡•ƒ‡‘„Œ‡ –ƒ””‹˜‡•Ž‹‰Š–Ž›†‹•’Žƒ ‡† ”‡ƒ–‹‰ƒ
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
‘†‹–‹‘•ǡƤ‡†‡–ƒ‹Ž‹•˜‹•‹„Ž‡‘–Š‡„”‹‰Š–‡”’Žƒ‡–•Ž‹‡—’‹–‡”ƒ†
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.
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General sky brightening caused by the Moon, aurorae, natural airglow and
Ž‹‰Š–’‘ŽŽ—–‹‘‰”‡ƒ–Ž›ƒơ‡ ––”ƒ•’ƒ”‡ ›ǤŠ‹Ž‡‘–ƒ’”‘„Ž‡ˆ‘”–Š‡
brighter stars and planets, bright skies reduce the contrast of extended
‡„—Žƒ‡ƒ‹‰–Š‡†‹ƥ —Ž–ǡ‹ˆ‘–‹’‘••‹„Ž‡–‘•‡‡Ǥ‘ƒš‹‹œ‡›‘—”
observing, limit deep sky viewing to moonless nights far from the light
’‘ŽŽ—–‡†•‹‡•ˆ‘—†ƒ”‘—†ƒŒ‘”—”„ƒƒ”‡ƒ•ǤƤŽ–‡”•‡Šƒ ‡†‡‡’
sky viewing from light polluted areas by blocking unwanted light while
–”ƒ•‹––‹‰Ž‹‰Š–ˆ”‘ ‡”–ƒ‹†‡‡’•›‘„Œ‡ –•Ǥ‘— ƒǡ‘–Š‡‘–Š‡”
hand, observe planets and stars from light polluted areas or when the
Moon is out.
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”ƒ•’ƒ”‡ ›‹•–Š‡ Žƒ”‹–›‘ˆ–Š‡ƒ–‘•’Š‡”‡™Š‹ Š‹•ƒơ‡ –‡†„›
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
ƒ‹‰ˆƒ‹–‡”‘„Œ‡ –•Šƒ”†‡”–‘•‡‡ƒ†”‡†— ‹‰ ‘–”ƒ•–‘„”‹‰Š–‡”
‘„Œ‡ –•Ǥ‡”‘•‘Ž•‡Œ‡ –‡†‹–‘–Š‡—’’‡”ƒ–‘•’Š‡”‡ˆ”‘˜‘Ž ƒ‹
‡”—’–‹‘•ƒŽ•‘ƒơ‡ ––”ƒ•’ƒ”‡ ›Ǥ†‡ƒŽ ‘†‹–‹‘•ƒ”‡™Š‡–Š‡‹‰Š–•›
is inky black.
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ĊĊĎēČĔēĉĎęĎĔēĘ
‹‡™‹‰ ‘†‹–‹‘•ƒơ‡ –™Šƒ–›‘— ƒ•‡‡–Š”‘—‰Š›‘—”–‡Ž‡• ‘’‡†—”‹‰
an observing session. Conditions include transparency, sky illumination
ƒ†•‡‡‹‰Ǥ†‡”•–ƒ†‹‰˜‹‡™‹‰ ‘†‹–‹‘•ƒ†–Š‡‡ơ‡ ––Š‡›Šƒ˜‡‘
observing will help you get the most out of your telescope.
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ćĘĊėěĎēČĊĊĕĐĞćďĊĈęĘ
‡‡’Ǧ•›‘„Œ‡ –•ƒ”‡•‹’Ž›–Š‘•‡‘„Œ‡ –•‘—–•‹†‡–Š‡„‘—†ƒ”‹‡•‘ˆ
‘—”•‘Žƒ”•›•–‡ǤŠ‡›‹ Ž—†‡•–ƒ” Ž—•–‡”•ǡ’Žƒ‡–ƒ”›‡„—Žƒ‡ǡ†‹ơ—•‡
nebulae, double stars and other galaxies outside our own Milky Way.
‘•–†‡‡’Ǧ•›‘„Œ‡ –•Šƒ˜‡ƒŽƒ”‰‡ƒ‰—Žƒ”•‹œ‡ǤŠ‡”‡ˆ‘”‡ǡŽ‘™Ǧ–‘Ǧ
moderate power is all you need to see them. Visually, they are too faint
–‘”‡˜‡ƒŽƒ›‘ˆ–Š‡ ‘Ž‘”•‡‡‹Ž‘‰‡š’‘•—”‡’Š‘–‘‰”ƒ’Š•Ǥ•–‡ƒ†ǡ
they appear black and white. And, because of their low surface brightness,
they should be observed from a dark-sky location. Light pollution around
Žƒ”‰‡—”„ƒƒ”‡ƒ•™ƒ•Š‡•‘—–‘•–‡„—Žƒ‡ƒ‹‰–Š‡†‹ƥ —Ž–ǡ‹ˆ‘–
‹’‘••‹„Ž‡ǡ–‘‘„•‡”˜‡Ǥ‹‰Š–‘ŽŽ—–‹‘‡†— –‹‘ƤŽ–‡”•Š‡Ž’”‡†— ‡–Š‡
background sky brightness, thus increasing contrast.