Celestial Observing - Celestron NexStar 102SLT 23090 Instruction Manual

CELESTIAL OBSERVING

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 that will affect your ability to observe
OBSERVING THE MOON
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 optional eyepieces for higher power (magnification) to
focus in on a smaller area
Lunar Observing Hints
To increase contrast and bring out detail on the lunar surface, use optional
filters A yellow filter works well to improve contrast, while a neutral density
or polarizing filter will reduce overall surface brightness and glare
OBSERVING THE PLANETS
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 may 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
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 manual (page12)
• To increase contrast and bring out detail on the planetary surface, try
using Celestron eyepiece filters
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ENGLISH