Celestron Astro Master 90eq Instruction Manual download pdf (Page 24)

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.

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 at

improving contrast while a neutral density or polarizing filter will reduce overall surface brightness and glare.

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.

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.

• To increase contrast and bring out detail on the planetary surface, try using Celestron eyepiece filters.

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.

For safe solar viewing, use a solar filter that reduces the intensity of the Sun's light, making it safe to view. With a filter

you can see sunspots as they move across the solar disk and faculae, which are bright patches seen near the Sun's edge.

• The best time to observe the Sun is in the early morning or late afternoon when the air is cooler.

• To center the Sun without looking into the eyepiece, watch the shadow of the telescope tube until it forms a

circular shadow.

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Celestron Astro Master 90eq Instruction Manual Page 24