Meade Image Processing Instrukcja Użytkownika Pobierz pdf (Strona 21)

click “yes” when asked.) Use the TELESCOPE tab in the OBJECT panel to PARK the

telescope before you switch it off.

(v) There is a button for rotating the image. Note that the shape and size of the

imaging and tracking CCD’s are indicated in red. Notice that every time you go

across (or, rather, around) the meridian, the image flips upside down. You’ll need

to rotate the view by 180º to match it with the camera images.

(vi) The meridian is indicated as a red dashed line. Once the telescope is linked, it

becomes a red band. The telescope cannot cross this line without hitting the peer,

but it will stop tracking through it automatically. (In practice, you’ll have to stop

taking images of that object for the day when this happens.) If you try to slew

through the meridian, the telescope will go around it through the North Pole. All

image taking should end (or start after) the object transits the meridian.

There are a few additional useful controls that you might need to use; you can learn

their use when you actually need them: TELESCPE → MOTION CONTROLS, VIEW → STELLAR

OPTIONS and DISPLAY EXPLORER, TOOLS → MOSAIC, DATA → COMETS AND MINOR PLANETS and

EXTENDED MINOR PLANETS.

You will certainly use DATA → TIME for the planning of your session; you’ll set the time

to the planned observation. You’ll need to know exactly what to do and when, otherwise

you waste your valuable telescope time.

● The imaging procedure

Planning the session

Careful and detailed planning is very important. During observation there is little time

to lose; a session without a plan will be almost surely fail.

The plan, as a minimum, should include the following: name, brightness and size of the

object; approximate coordinates and constellation in which it is located; the object’s transit

time and its altitude at transit; the planned beginning and end of the observing session; the

hour angle and altitude of the object at the beginning and at the end of the observation; the

planned exposure times with each filter used; the necessary orientation of the camera.

All these data can be read off TheSky ahead of time. It is important to have the object as

high up as possible; and you cannot image it both before and after transit. Pick a few hours

before or after transit. Make sure you have enough time set aside for setting up and re-

aiming between exposures.

Setting up the telescopes is the responsibility of the instructor, but students are expected

to fully participate in the process.

The slit and the windows of the dome must be open around sunset. Except for very cold

weather, ice cubes are added to the cooling water. The computer, the telescope, and the

CCD are powered up. A new folder is created in the “Raw Images” folder for all the day’s

images. A copy of an old “Note” file is placed in it, with the appropriate changes in names,

dates, etc. We will assume that flats (which need to be taken just before sunset) have been

taken care of, and the camera has been already turned at the necessary angle.

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Meade Image Processing Instrukcja Użytkownika Strona 21