The Planetary Tab makes available some acquisition functions specifically designed for planetary observations.

When performing acquisitions with the Planetary Tab, the Audine camera is used in half-frame mode. In this mode, the planet must be put in the top half part of the CCD. When reading the CCD, after the integration phase, PISCO performs a quick transfer of the image from to top part to the bottom part. Almost no light comes down in the bottom part, and the CCD can be read normally without additional parasite light that would affect the image. The drawback of this method is that only the top half part of the CCD can be used to actually produce images. As an example, it is impossible to get a full image of the Moon in this mode (most of the time, the Moon requires the full frame). However, this method allows you to perform quick exposures (typically 0.05 second) without any mechanical movement. This eliminates all the vibrations usually observed with an obturator. Reliability is also very good.

Before performing an exposure, you must define the image size. You must choose for the X axis between 64, 128, 256, 512 and 768 pixels and for the Y axis between 64, 128 and 256. The smaller the window, the quicker the image acquisition. You must choose the windows size according to the size of the planetary image (that defines the sampling) and also according to the ability of your telescope to perform an accurate tracking with a long focus.

As usually, you must define the exposure time. This time will usually be quite small for a planetary exposure. The check box Auto indicates that you let PISCO choose the exposure time so that the planetary image represents 80% of the CCD dynamic range.

In order to make easier the positioning of the planet in the top part of the CCD, you can use the Pointing button. By using this button, you run a command that performs a very quick digitization of the whole image (resolution is poor in that case). Image is displayed in a reduced format with a rectangle that indicates where you must position the planet with respect to the format in the normal acquisition mode.

The buttons GO, Save and Stop allow you, as in the other modes, to launch an exposure, to save it (in the current directory) and to stop it. Furthermore, if the text box Index contains a value, the image name will be indexed with an automatic increment each time a save is performed.

You can perform image acquisition in a continuous mode by checking the Continuous button. This is useful for centering or focusing. Note that it is not possible to save images in this mode.

In order to save a series of images, you must check the Burst box. In the example below, you are going to perform 12 exposures automatically and give the names sat1, sat2, ..., sat12 to the images.

Usually, when using the Planetary mode, you can decide whether you want to keep an image and save it to the disk (button Save), depending on the turbulence.

It is always possible to recall the previous image in case you regret not to have saved it. Use for that purpose the Recall button.

The button Copy displays the last image that has been exposed in the display window on the right. This allows you to have a reference image for the next exposures.

The series of buttons Mask, Setting and Cancel allows you to apply an unsharp masking to the last image exposed. This increases the image contrast.

You must first use the Settings button to adjust the unsharp mask settings. A dialog box is displayed:
The unsharp level can be adjusted using the Sigma parameter (the higher Sigma is, the sharper the image, even if the noise increases in the same time). Contrast can be adjusted using the Coefficient parameter (a value between 2 and 8 is usually correct). Finally, click the OK button. Note that all your settings are saved for your next session with PISCO.

To actually apply the filter, click the Mask button. To go back to an unfiltered image, click the Cancel button.