24
When the procedure is performed correctly, "Alignment Successful" displays.
If Autostar II does not display this message, perform this procedure again.
Note:
Alignment stars may change from night to night. All that is required
is for the observer to center the selected stars in the eyepiece when
prompted.
Observe a Star using the Automatic Tracking Feature
Now that your telescope has been aligned, you are able to track celestial objects. In
this example, the Autostar II Arrow keys are used to find a star, and then Autostar II's
tracking capability automatically keeps the star centered in your telescope's eyepiece.
1.
When Automatic Alignment is completed (as described in the previous section),
"Select Item: Object" displays on Autostar II.
2.
Select a bright star from one of the Object menus. You may choose any unob-
structed, bright star for the purposes of this example. Use the viewfinder (
21, Fig.
1a
) to help line up on the star. Use Autostar II's Arrow keys to center the star in
the eyepiece. The tracking motors will then keep the star you have chosen in the
center of the eyepiece.
Go To Saturn
This exercise demonstrates how to select a celestial object, the planet Saturn, for
viewing from Autostar II’s Solar System library. Objects in the eyepiece should main-
tain their position even though the Earth is rotating beneath the stars. In other words,
the telescope tracks the chosen objects.
Note:
Saturn is not visible the entire year; you may need to choose anoth-
er object from any of Autostar II's many object libraries; however, the pro-
cedure, as described below, remains the same.
1
After the telescope is aligned, press Number key "5."
2.
“Solar System: Mercury” displays. Keep pressing the Scroll Down key until “Solar
System: Saturn” displays.
3.
Press ENTER. “Calculating” displays. Then “Saturn” and a set of coordinates dis-
plays. Note that Saturn’s (and other planets’) coordinates change throughout the
year.
4.
Press GO TO. “Saturn: Slewing...” displays and the telescope slews until it finds
Saturn.You may need to use the Arrow keys to center Saturn precisely in the eye-
piece. Autostar II then automatically moves the telescope so that it "tracks"
Saturn (or whatever other object you may have chosen);
i.e.,
Saturn remains cen-
tered in the eyepiece.
Using the Guided Tour
The Guided Tour feature is an easy and fun method of exploring Autostar II's GO TO
capabilities. This example demonstrates using “Tonight’s Best” Guided Tour.
1.
After observing Saturn, keep pressing MODE until “Select Item: Object” displays
again.
2.
Press the Scroll Down key twice. “Select Item: Guided Tour” displays.
3.
Press ENTER. “Guided Tour: Tonight’s Best” displays. Press ENTER.
Note:
If you wish to try out other Guided Tours, press the Scroll Down key
to scroll through other tour choices. When the tour you wish to select dis-
plays, press ENTER.
4.
“Tonight’s Best: Searching...” displays. After calculating, “Tonight’s Best: Jupiter”
displays.
Note
: Different objects may be displayed on a tour list on any given night.
Press ENTER to display information about the object. Press GO TO to move the
telescope to the object.
Important Note:
While performing the
automatic tracking proce-
dure, only use the Arrow
keys to move the tele-
scope. Once the tele-
scope has been aligned,
do not loosen the tele-
scope locks (
13 and 17,
Fig. 1a
), or move the
base manually, or align-
ment will be lost.
Tip:
To manually enter the
R.A. and Dec. coordi-
nates of an object:
Press and hold MODE for
two seconds or more. The
R.A. and Dec. coordi-
nates display. Press GO
TO. "Object Position" and
a set of coordinates dis-
plays. Then enter the R.A.
and Dec. coordinates of
any celestial object using
Number keys. As soon as
the coordinates are
entered, Autostar II slews
the telescope to the coor-
dinates. Note that the tel-
escope must be initial-
ized for this procedure to
operate properly.
Tip:
The GO TO key also
allows you to perform a
"
spiral search
." A spiral
search is useful when the
telescope slews to an
object, but that object is
not visible in the eyepiece
after the telescope finish-
es its search. (This some-
times occurs during an
alignment procedure.)
Press GO TO when the
telescope stops slewing.
The telescope begins to
move in a spiral pattern at
a very slow speed around
the search area. Look
through the eyepiece and
when the object does
become visible, press
MODE to stop the spiral
search. Then use the
Arrow keys to center the
object.
Summary of Contents for RCX400
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