Bedienungsanleitung Celestron AstroMaster 90 EQ-MD (Seite 20 von 32) (Englisch)

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Pointing at Sigma Octantis

This method utilizes Sigma Octantis as a guidepost to the celestial pole. Since Sigma Octantis is about 1° degree from

the south celestial pole, you can simply point the polar axis of your telescope at Sigma Octantis. Although this is by no

means perfect alignment, it does get you within one degree. Unlike the previous method, this must be done in the dark

when Sigma Octantis is visible. Sigma Octantis has a magnitude of 5.5 and may be difficult to see and a binocular may

be helpful as well as the finderscope.

1. Set the telescope up so that the polar axis is pointing south.

2. Loosen the DEC clutch knob and move the telescope so that the tube is

parallel to the polar axis. When this is done, the declination setting circle

will read 90°. If the declination setting circle is not aligned, move the

telescope so that the tube is parallel to the polar axis.

3. Adjust the mount in altitude and/or azimuth until Sigma Octantis is in the

field of view of the finder.

4. If the above is done correctly, you should be able to observe near the pole

through the finderscope and a low power eyepiece.

Remember, while Polar aligning, do NOT move the telescope in R.A. or

DEC. You do not want to move the telescope itself, but the polar axis. The

telescope is used simply to see where the polar axis is pointing.

Like the previous method, this gets you close to the pole but not directly on it.

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This method helps improve your polar alignment and gets you closer to the pole that the above methods. This will

improve your accuracy for more serious observations and photography.

In each hemisphere, there is a point in the sky around which all the other stars appear to rotate. These points are called

the celestial poles and are named for the hemisphere in which they reside. For example, in the southern hemisphere all

stars move around the south celestial pole. When the telescope's polar axis is pointed at the celestial pole, it is parallel to

the Earth's rotational axis.

Many methods of polar alignment require that you know how to find the

celestial pole by identifying stars in the area. Observers in the southern

hemisphere are not as fortunate as those in the northern hemisphere. The

stars around the south celestial pole are not nearly as bright as those

around the north celestial pole. The closest star that is relatively bright is

Sigma Octantis. This star is just within naked eye limit (magnitude 5.5)

and lies about 1° from the south celestial pole but can be difficult to

locate.

Therefore, with this method, you will use star patterns to find the south celestial pole. Draw an imaginary line toward

the SCP through Alpha Crucis and Beta Crucis (which are in the Southern Cross). Draw another imaginary line toward

the SCP at a right angle to a line connecting Alpha Centauri and Beta Centauri. The intersecting of these two imaginary

lines will point you close to the south celestial pole.

Figure 4-8

Figure 4-9

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