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Space Observation and Travel
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Fixed base (rests on ground)
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Azimuth bearing Figure 20-12 A Dobsonian mount is convenient for use
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with large Newtonian reflectors
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table can interfere with the full range of movement of the Dobsonian mount However, at higher latitudes, including most of Europe and North America, the equatorial table is a convenient option
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One of the best-known sets of telescope bearings is found in the German equatorial mount It can be recognized by its unique configuration and counterweight (Fig 20-13) It, like the fork mount/wedge, moves along RA and declination coordinates The RA axis is adjustable and must be aimed at the north celestial pole The most sophisticated German equatorial mounts are equipped with sighting scopes that make them fairly easy to align Once the mount is adjusted properly and the telescope is aimed at an object in the sky, the object can be followed by moving only the RA bearing Some people find the German equatorial mount unnatural and awkward, especially when observing things in the circumpolar region However, a well-made and well-adjusted system of this type is superior to any other for serious use with massive and bulky telescopes Not surprisingly, the best German equatorial mounts are expensive Some of the largest ones, including a heavy-duty pedestal base, cost more than $2,000
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To north celestial pole
Declination bearing Counterweight
Right ascension bearing Fixed base
Figure 20-13 Simplified drawing of a German equatorial mount
CLOCK DRIVE
If you want to gaze at celestial objects through a telescope for a long time, a clock drive is a great convenience This is especially true if you have a group of people, each of whom must look through the telescope in turn and not all of whom are experts at aiming it The higher the magnification, the more quickly a celestial object will drift out of the field of view unless some compensation is made Objects near the celestial equator drift faster than objects near the celestial pole The heart of the clock drive is a slow motor that makes one complete 360degree revolution per sidereal day, that is, every 23 hours and 56 minutes
PART 5
Space Observation and Travel
This is accomplished by gearing-down and precise regulation of the actual motor speed Clock drives are typically designed to work with either a fork mount/wedge or a German equatorial mount because only the RA bearing needs to be connected to the motor Clock drives can function with az-el drive systems, but they are more complicated and more expensive because both bearings must be adjusted by the device as time passes With any clock drive, the quality of the gears is particularly important If there is significant play in the gears, the telescope will wobble with the slightest disturbance This effect is particularly annoying at higher magnification and takes away much of the advantage of the clock drive If you plan to do any time-exposure astrophotography with your telescope, you will need a clock drive, an equatorial mount, and a guiding device that makes minute corrections based on a guide star that you select within the field of view Under these circumstances, telescope vibration and gear play cannot be tolerated at all Clock drives require a source of electrical power This can be a battery, or it can be the household utility current Batteries tend to wear out fast in most clock drives, and they never go dead when it s convenient (No time is convenient for a power failure!) Use of the utility power requires an extension cord
COMPUTERIZED DRIVES
In recent years, a number of amateur telescopes, particularly SCTs, have been made available equipped with microcomputers that automatically guide the instrument to any of several thousand objects in the sky These telescopes are manufactured by Celestron, Inc, among others The most sophisticated models incorporate Global Positioning System (GPS) receivers so that the alignment process is automatic You don t even have to know where on Earth you are to set up such a telescope and use it A computerized drive, like the venerable videocassette recorder (VCR), requires the user to climb a learning curve The system must be programmed and objects selected according to a certain sequence of entries The information is entered on a keypad, and the system status is displayed on a screen You also can locate objects manually using a set of up/down and left/right (or north/south and east/west) buttons The slew rate (the speed at which the telescope turns as you hold down one of the buttons) can be selected over a range from slowest to fastest, for example, from 1 (very slow) to 9 (quite fast) Once an object has been located in the sky, the telescope can be programmed to follow it This scheme can work with az-el or equatorial systems, but if you have astrophotography in mind, the equatorial system is a must
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