Nexstar 102 Manuel D’Utilisation
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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.
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 eyepiece filters. A yellow filter works well at
improving contrast while a neutral density or polarizing filter will reduce overall surface brightness and glare.
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.
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.
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Although overlooked by many amateur astronomers, solar observation is both rewarding and fun. However, because
the Sun is so bright, special precautions must be taken when observing our star so as not to damage your eyes or your
telescope.
Never project an image of the Sun through the telescope. Tremendous heat build-up may result inside the
optical tube. This can damage the telescope and/or any accessories attached to the telescope.