Celestron NEXSTAR 4, Instruction Manual

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With your telescope set up, you are ready to use it for observing. This section covers visual observing hints for both
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. Change to higher power
(magnification) to focus in on a smaller area. Choose the
lunar tracking
rate from the NexStar's MENU tracking rate options to keep the moon
centered in the eyepiece even at high magnifications.
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To increase contrast and bring out detail on the lunar surface, use
filters. A yellow filter 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.
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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.
•
To increase contrast and bring out detail on the planetary surface,
try using Celestron eyepiece filters.