User manual MEADE DS-2090AT-TC

[. . . ] Instruction Manual DS-2000 Series Reflecting and Refracting Telescopes MEADE. COM Refracting Telescopes use a large objective lens as their primary light-collecting element. Meade refractors, in all models and apertures, include achromatic (2-element) objective lenses in order to reduce or virtually eliminate the false color (chromatic aberration) that results in the telescopic image when light passes through a lens. Reflecting Telescopes use a concave primary mirror to collect light and form an image. In the Newtonian type of reflector, light is reflected by a small, flat secondary mirror to the side of the main tube for observation of the image. Eyepiece F 2-Element Objective Lens Refracting Telescope In the refracting telescope, light is collected by a 2-element objective lens and brought to a focus at F. Secondary Mirror Concave Mirror F Reflecting Telescope Eyepiece In contrast, the reflecting telescope uses a concave mirror for this purpose. CONTENTS WARNING! Never use a Meade® Telescope to look at the Sun! [. . . ] Press GO TO a second time to slew the telescope to that star. Use the Scroll keys to cycle through the list of stars in the constellation, from brightest to dimmest. Deep Sky is a database of objects outside our Solar System such as nebulae, star clusters, galaxies, and quasars. Star is a database of stars listed in different categories such as named, double, variable, or nearby. Satellite is a database of Earth-orbiting objects such as the International Space Station, the Hubble Space Telescope, Global Positioning System (GPS) satellites, and geosynchronous orbit satellites. User Objects allows the user to define and store in memory deep-sky objects of specific interest that are not currently in the Autostar database. See "Appendix B" for more information. Select Item: Object Solar System Mercury Etc. Moon Asteroids Comets Constellations Andromeda Etc. Deep Sky Named Object Galaxies Nebulae Messier Etc. Star Named SAO Catalog Double Variable Etc. Satellite Select Add Delete Edit User Objects Select Add Delete Edit Landmarks Select Add Delete Identify Select Item: Event Sunrise Sunset Moonrise Moonset Moon Phases Next Full Moon Next New Moon Next 1st Qtr Next 3rd Qtr Meteor Showers Quadrantids Lyrids Eta Aquarids Delta Aquarids Perseids Orionids Taurids Leonids Geminids Ursids Solar Eclipses Lunar Eclipses Autumn Equinox Vernal Equinox Winter Solstice Summer Solstice Select Item: Guided Tour Tour Objects Tonight's Best How Far is Far A Star's Life Downloaded Tours User-created Tours Select Item: Glossary A. . . Z. . . Select Item: Utilities Timer Set Start & Stop Alarm Set On & Off Eyepiece Calc. Field of View Magnification Suggest Display Options Sun Warning Getting Started Brightness Adj. Beep Sleep Scope Park Scope Cord Wrap Select Item: Setup Align Easy One Star Two Star Date Time Daylight Saving Telescope Telescope Model Focal Length Az/RA Ratio Alt/Dec Ratio Mount Az/RA Percent Alt/Dec Percent Train Drive Tracking Rate Reverse L/R Reverse Up/Dn Quiet Slew Max Elevation Min AOS Calibrate Motor High Precision Targets Astronomical Terrestrial Site Select Add Delete Edit Download Statistics Reset Fig. 22: The Complete Autostar Menu Structure. 22 Landmarks stores the location of terrestrial points of interest in the permanent Autostar database. IMPORTANT NOTE: To use the Landmark function, the telescope must be located and aligned exactly as when the landmark was added to the database. { Select: To select a Landmark already in the database (see ADD below), choose the "Select" option and scroll through the list. Press ENTER to select a Landmark, then press GO TO and the telescope slews to the object. Add: To add a Landmark, choose the "Add" option. Locate and center the Landmark in the eyepiece, then press ENTER. { Identify is an exciting feature for an observer who wants to scan the night sky and start exploring. After the telescope has been properly aligned, use the Autostar Arrow keys to move about in the sky. Never use a Meade DS2000 Telescope to look at the Sun!Looking at or near the Sun will cause instant and irreversible damage to your eye. [. . . ] Most impressive of these is the Great Nebula in Orion (M42), a diffuse nebula that appears as a faint wispy gray cloud. Open Clusters are loose groupings of young stars, all recently formed from the same diffuse nebula. The Pleiades is an open cluster 410 light years away (Fig. Constellations are large, imaginary patterns of stars believed by ancient civilizations to be the celestial equivalent of objects, animals, people, or gods. [. . . ]