User manual CELESTRON ADVANCED CG-4 MOUNT

[. . . ] · C80-HD Refractor Telescope · C102-HD Refractor Telescope · C114-HD Reflector Telescope · C150-HD Reflector Telescope · CG-4 Equatorial Mount Models #21077 / #21016 / #31027 / #31056 / #91510 INSTRUCTION MANUAL 1 IDENTIFYING PARTS OF FIGURE 1 1. Star Diagonal (Refractors only) Eyepiece Finderscope Finder Bracket Focuser Tube Rings Objective Cap Optical Tube Platform DEC Setting Circle R. A. Setting Circle Polar Finder (Optional) 13. Accessory Tray Mounting Screws 3. 4. 6. 2. 1. 5. Figure 1A C80-HD & C102-HD 4. [. . . ] Many of the methods of polar alignment require that you know how to find the celestial pole by identifying stars in the area. For those in the northern hemisphere, finding the celestial pole is not difficult. Fortunately, we have a naked eye star less than a degree away. This star, Polaris, is the end star in the handle of the Little Dipper. Since the Little Dipper (technically called Ursa Minor) is not one of the brightest constellations in the sky, it may be difficult to locate, especially from urban areas. If this is the case, use the two end stars in the bowl of the Big Dipper. Draw an imaginary line through them toward the Little Dipper. The position of the Big 10 Dipper will change during the year and throughout the course of the night. When the Big Dipper is low in the sky (i. e. , near the horizon) it may be difficult to locate. Figure 6 Figure 7 To make finding and tracking the stars easier, a rough polar alignment is required. The right ascension (polar) axis should be pointed towards the North Pole (see figure 7). Set the latitude of the telescope to the latitude of your observing location by turning the azimuth adjustment screws (#14) on the mount. The latitude of your observing location corresponds to the altitude that Polaris will appear to be above the horizon. For example, If you are observing from Los Angeles, which has a latitude of 34°, then the celestial pole (and Polaris) will be 34° above the northern horizon. All a latitude scale does then is to point the polar axis of the telescope at the right elevation above the northern (or southern) horizon. Release the DEC clamp 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. 4. 11 5. Using the altitude and azimuth adjustment screws (#14 & #20), move the mount until Polaris is in the field of view of the finderscope. Rough adjustments in azimuth can be made by moving the tripod. Center Polaris using the altitude and azimuth controls. Remember, do not move the telescope in R. A. You want to adjust the direction the polar axis is pointing and you are using the telescope to see where the polar axis is pointing. 6. This gets you close to the pole but not directly on it. In order to improve your accuracy for more serious observations and photography Celestron offer an optional Polar Axis Finderscope (#94221) that fits into the polar axis of the mount. Aligning the R. A. Setting Circle Before you can use the setting circles to find objects in the sky you need to align the R. A. [. . . ] Celestron warrants this telescope to be free from defects in materials and workmanship for two years. Celestron will repair or replace such product or part thereof which, upon inspection by Celestron, is found to be defective in materials or workmanship. As a condition to the obligation of Celestron to repair or replace such product, the product must be returned to Celestron together with proof-of-purchase satisfactory to Celestron. The Proper Return Authorization Number must be obtained from Celestron in advance of return. [. . . ]