Assessments - 2, GPA: 4
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(If the telescope is perfectly aligned with the pole—no declination change will be required to follow stellar objects). For occasional visual observations through the telescope, aligning the telescope's polar axis by one or two degrees in relation to the pole is more than enough. With this level of aiming precision the telescope can achieve precise tracking if the R.A. flexible control cable is used while maintaining the objects within the telescope's FOV for some 20 to 30 minutes. To polar-align the telescope: 1. Level the equatorial mount by adjusting the length of the three tripod legs (2). 2. Loosen the latitude adjustment knob (24) and tilt the mount until the pointer on the latitude scale is set at the latitude of your observing site. If you don’t know your latitude, consult a geographical atlas or search the internet. For example, if your latitude is 35° north, set the pointer to 35. Then retighten the latitude knob. The latitude setting should not have to be adjusted again unless you move to a different viewing location some distance away. 3. Loosen the Dec. lock knob (12) and rotate the telescope optical tube (11) until it is parallel with the R.A. axis, as it is in Figure 1. The pointer on the Dec. setting circle (13) should read 90°. Retighten the Dec. lock knob. 4. Loosen the azimuth adjustment knob (23) on the mount and rotate the mount so the telescope tube (and R.A. axis) points roughly at Polaris. If you cannot see Polaris directly from your observing site, consult a compass and rotate the mount so the telescope points north. Retighten the azimuth adjustment knob. Ursa minor Polaris Cassiopeia Ursa major Finding Polaris The equatorial mount is now polar aligned. From this point on in your observing session, you should not make any further adjustments in the azimuth or the latitude of the mount, nor should you move the tripod. Doing so will undo the polar alignment. The telescope should be moved only about its R.A. and Dec. axes. Having trouble setting up or making it work? Email us at 900X70@ioptron.com We’ll be glad to help! 9 4. Using the Telescope With the telescope aligned on the pole, you are now ready to start your observations. 4.1. Getting familiar with you mount and telescope Before observing a celestial object, looking at terrestrial objects during the day provides a good exercise on how to operate the mount and telescope. 4.2. Star observation First of all you will need to choose an object that is easy to find. The Moon or a bright star is a good target to start with. 1. Slightly loose the telescope's Right Ascension locking knob (14) and the Declination locking knob (12), located close to the Declination adjustment ring (13). By applying slight pressure by hand, the telescope should now move freely along its two axes. 2. Move the telescope along R.A. and Dec axes and using the aligned finderscope to find the Moon. With the object centered in the finderscope's cross hairs, retighten the R.A. and Dec. knobs. 3. The Moon should be visible somewhere within the FOV of main telescope. Focus the image by adjusting the focusing knob (26). Center the Moon by adjusting the mount using RA and DEC control cable (27, 28). 4. You’ll find that the object immediately starts to shift across the FOV. This motion is due to the earth rotation. To "track" the object and keep it in the FOV, turn the cable that controls R.A. slow motion (27). Objects will appear to move faster at higher magnifications. The Declination control cable (28) is only used for centering the object and not for tracking. 4.3. Observation Tips When selecting a location for observing, get as far away as possible from direct artificial light such as street lights, porch lights, and automobile headlights. The glare from these lights will greatly impair your dark-adapted night vision. Set up on a grass or dirt surface, not asphalt, because asphalt radiates more heat, which disturbs the surrounding air and degrades the images seen through the telescope. Avoid viewing over rooftops and chimneys, as they often have warm air currents rising from them. Avoid observing from indoors through an open (or closed) window, because the temperature difference between the indoor and outdoor air will cause image blurring and distortion. Furthermore, it is preferable to let your telescope reach outside ambient (surrounding) temperature before starting an observation cycle. Wait a few minutes to allow your eyes to become used to the darkness before attempting any serious observations. Use a flashlight with a red filter to preserve your night vision when looking at star maps or checking telescope parts. Avoid touching the eyepiece during observation. Vibration generated by this contact may cause the view to move. Also avoid observing from locations where terrestrial vibrations are significant. Observing from the upper floors of buildings may also cause the images vibrating. Warning! Never attempt to observe the sun through your telescope without a pro...
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