Meade LXD55 instruction manual Tracking Rates

Page 57

Step 2.

Step 3.

 

 

 

 

 

 

 

 

Step 4.

Step 5.

Fig. 46a: Indicator Light Key for changing tracking rates in the Northern Hemisphere Polar mode.

Step 2.

Step 3.

 

 

 

 

 

 

 

 

Step 4.

Step 5.

Fig. 46b: Indicator Light Key for changing tracking rates in the Southern Hemisphere Polar mode.

7.When the test is complete, light 1 remains on; lights 2, 3, and 4 turn off.

8.Use the four Arrow keys (1, Fig. 42) to slew the telescope to the desired object. To change the slew speed, press SPEED.

9.Fine-adjust the position of the object with the Electronic Controller Arrow keys so that it is centered in the viewfinder. The object is now ready to be viewed through the telescope’s eyepiece.

Tracking Rates

In polar mode the Electronic Controller normally tracks objects at the sidereal rate (see TRACKING OBJECTS, page 17). For most observing sessions (once the telescope has been polar aligned and the tracking motor activated), there is little need to change this speed.

For objects, like the Moon or a comet, that move at slightly different rates, the Electronic Controller Arrow keys (1, Fig. 42) are sufficient to move the telescope slightly as the object very slowly moves off-center through the eyepiece field.

To change the tracking rate, for extended observations of an object not moving at the sidereal rate, follow the procedure for the appropriate hemisphere:

Use the following procedure to change tracking rates when using the Northern Hemisphere polar mode. Refer to Fig. 46a.

1.Press and hold MODE (5, Fig. 42) until the Mode function is active (i.e., lights 1 and 2 are on steady; lights 3 and 4 signify whatever tracking mode was last cho- sen).

2.Press SPEED (3, Fig. 42) until lights 1, 2, and 3 are on steady with light 4 blink- ing. The telescope is now in the Northern Hemisphere polar mode.

3.Press IN (7, Fig. 42) and light 4 comes on steady. The tracking rate is now 0.5% faster than sidereal. If the object you're tracking is moving faster than the sidere- al rate, look through the eyepiece and press IN. Each time you press IN, the track- ing rate increases by 0.5%. Note that when the Mode function is active, the tracking motor stops. To restart the tracking motor, press MODE again. Experiment with this function to get the right speed: Press IN to set the tracking rate. Then press MODE and look through the eyepiece. Continue pressing IN and MODE until the object remains centered with little or no drifting in the eyepiece.

Note: The tracking rate can be increased by up to 65%.

4.To use a rate slower than sidereal, press OUT (6, Fig. 42) until light 4 blinks again (sidereal rate). Press OUT again and light 4 goes out, signifying a tracking rate 0.5% slower than sidereal. Note that when the Mode function is active, the tracking motor stops. To restart the tracking motor, press MODE again. Experiment with this function to get the right speed: Press OUT to set the track- ing rate. Then press MODE and look through the eyepiece. Continue pressing OUTand MODE until the object remains centered with little or no drifting in the eyepiece.

Note: The tracking rate can be decreased by up to 65%.

5.Press and hold MODE until only a single light is on. This exits the Mode function. If Northern or Southern Hemisphere polar mode was chosen, the motor drive starts operating at the sidereal rate.

6.Use the four Arrow keys (1, Fig. 42) to slew the telescope to the desired object. To change the slew speed, press SPEED.

Use the following procedure to change tracking rates when using the Southern Hemisphere polar mode. Refer to Fig. 46b.

1. Press and hold MODE (5, Fig. 3) until the Mode function is active (i.e., lights 1 and 2 are on steady; lights 3 and 4 signify the tracking mode last chosen).

2. Press SPEED (3, Fig. 3) until lights 1 and 2 are on steady, light 3 is off, and Light 4 is blinking.

3. Press IN (7, Fig. 3) and light 4 comes on steady. The tracking rate is now 0.5% faster than sidereal. Note that when the Mode function is active, the tracking motor stops. To restart the tracking motor, press MODE again. Experiment with this function to get the right speed: Press IN to set the tracking rate. Then press MODE and look through the eyepiece. Continue pressing IN and MODE

until the object remains centered with little or no drifting in the eyepiece.

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Contents Meade Instruments Corporation Page Contents 1 1% g f e Telescope Features$2% LXD55-SeriesYour Personal Window to the Universe Computer Control Panel see e LXD55 Tips Autostar Features FeaturesTour the Cosmos with Just the Push of a Button Tip Telescope Assembly How to Assemble Your TelescopeAccessories Getting StartedViewfinder assembly Schmidt-Newtonian models Insert eyepiece into holder and tighten thumbscrews Balancing the TelescopeChoosing an Eyepiece Aligning the ViewfinderObserving by Moving the Telescope Manually Too Much Power?Slew Speeds Autostar Models Only Activate the Arrow Keys Autostar Models OnlyObserve the Moon Setting the Polar Home PositionTracking Objects 16bUsing Autostars GO to Capabilities Autostar Models Only Observe a Star using the Automatic Tracking FeatureInitializing Autostar Autostar Models Only Moving Through Autostar’s Menus Autostar Models OnlyTraining the Drive Autostar Models Only Go To Saturn Autostar Models Only Easy Alignment Autostar Models OnlyPlanet Saturn is over 800 million miles from the Earth Using the Guided Tour Autostar Models OnlyTo Calculate Sunset time Autostar Navigation ExerciseNavigating Autostar Entering Data into AutostarSelect Item Object Autostars MenusObject Menu MenusGlossary Menu Event MenuUtilities Menu LXD55-SeriesEnter Setup MenuObserving Considerations Setup Menu Daylight SAVING, Surf the Web Adding Observing Sites To Add a Site to the user-defined site listTo Edit a Site To GO to a user-entered object Using Autostar to Find Objects Not in the LibrariesObserving Satellites LandmarksTo Add a landmark to the database To Check on the Available Memory To Select a landmark from the databaseTo perform a Landmark Survey Few tips on photography with the LXD55-Seriestelescopes Photography10 f/4 Optional AccessoriesSeries 4000 Photo-Visual Page General Maintenance MaintenanceD e f g Page Defocused star images. Misaligned 1, 2, Aligned Inspecting the Optics Meade Customer ServiceSpecifications 5 Model SN-6, SN-6EC Specifications4 Model SN-8, SN-8EC Specifications 10 f/4 Model SN-10 Specifications 9.3 Model AR-5, AR-5EC Specifications8 Model AR-6 Specifications 10 Model SC-8 Specifications Autostar SpecificationsAutostar Dimensions Appendix a Celestial Coordinates Setting CirclesOne- and Two-Star Polar Alignment Locating the Celestial PoleOne-Star Polar Alignment Two-Star Polar AlignmentProcedure #1 To correct for attitude misalignment Axis Alignment ProcedurePolar Alignment Viewfinder Method 1 Manual AlignmentPosition a Procedure #2 To correct for elevation misalignmentTips Star ChartsMethod 2 Axis Alignment Using Autostar Latitude Chart for Major Cities of the World Appendix C Latitude ChartCity State/Prov./Country Latitude City Country LatitudeAppendix D EC Handbox To move the telescope using the Electronic Controller Modes of OperationSlew Speeds Tracking Rates Optional Autostar Computer Controller for LXD55 EC Users Changing the Polar ModeMounting the SC bracket and optical tube to the mount How to Attach the Optical Tube to the MountAutostar Glossary Appendix F Basic AstronomyObjects in Space MoonDeep-Sky Objects PlanetsFurther Study Page Meade Instruments Corporation
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