Celestron OMNI XLT 102 用户手册
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With your telescope set up, you are ready to use it for observing. This section covers visual observing hints
for solar system and deep sky objects as well as general observing conditions which will affect your ability to
observe.
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Often, it is tempting to look at the Moon when it is
full. At this time, the face we see is fully illuminated
and its light can be overpowering. In addition, little
or no contrast can be seen during this phase.
One of the best times to observe the Moon is during
its partial phases (around the time of first or third
quarter). Long shadows reveal a great amount of
detail on the lunar surface. At low power you will be
able to see most of the lunar disk at one time. For the
Schmidt-Cassegrain telescope, the optional
Reducer/Corrector lens allows for breath-taking views
of the entire lunar disk when used with low power
eyepieces. Change to optional eyepieces for higher
power (magnification) to focus in on a smaller area.
full. At this time, the face we see is fully illuminated
and its light can be overpowering. In addition, little
or no contrast can be seen during this phase.
One of the best times to observe the Moon is during
its partial phases (around the time of first or third
quarter). Long shadows reveal a great amount of
detail on the lunar surface. At low power you will be
able to see most of the lunar disk at one time. For the
Schmidt-Cassegrain telescope, the optional
Reducer/Corrector lens allows for breath-taking views
of the entire lunar disk when used with low power
eyepieces. Change to optional eyepieces for higher
power (magnification) to focus in on a smaller area.
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To increase contrast and bring out detail on the lunar surface, use optional eyepiece filters. A yellow filter
works well at improving contrast while a neutral density or polarizing filter will reduce overall surface
brightness and glare.
works well at improving contrast while a neutral density or polarizing filter will reduce overall surface
brightness and glare.
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Other fascinating targets include the five naked eye planets. You
can see Venus go through its lunar-like phases. Mars can reveal a
host of surface detail and one, if not both, of its polar caps. You
will be able to see the cloud belts of Jupiter and the great Red Spot
(if it is visible at the time you are observing). In addition, you will
also be able to see the moons of Jupiter as they orbit the giant
planet. Saturn, with its beautiful rings, is easily visible at moderate
power.
can see Venus go through its lunar-like phases. Mars can reveal a
host of surface detail and one, if not both, of its polar caps. You
will be able to see the cloud belts of Jupiter and the great Red Spot
(if it is visible at the time you are observing). In addition, you will
also be able to see the moons of Jupiter as they orbit the giant
planet. Saturn, with its beautiful rings, is easily visible at moderate
power.
Planetary Observing Hints
• Remember that atmospheric conditions are usually the limiting factor on how much planetary detail will
be visible. So, avoid observing the planets when they are low on the horizon or when they are directly
over a source of radiating heat, such as a rooftop or chimney. See the "Seeing Conditions" section later
in this section.
over a source of radiating heat, such as a rooftop or chimney. See the "Seeing Conditions" section later
in this section.
• To increase contrast and bring out detail on the planetary surface, try using Celestron eyepiece filters.