Deep Sky

The Deep Sky tab contains information about 545 deep sky objects - the Messier Catalog, Herschel 400 Catalog, and most of Caldwell and Hidden Treasures catalogs.
Selecting an object will display information like Name, Constellation, Magnitude, Size and interesting facts about it. The last column - Size (px) contains the calculated size in pixels for your camera/telescope setup. It will be populated when camera and focal length are defined in the Object Calculator.
The main sources for interesting facts about the Messier objects are “http://wikipedia.org” and “http://seds.org/messier”/. The facts for the other objects and all audio recordings are compiled and recorded by Jeff Seivert.
To install the audio extension, download the desired package from the Download page of the APT’s site. After that in the folder where APT is installed create a sub-folder named "ObjectBrowserAudio" and extract the audio package there. The button "Play" in Object Browser will be available for all objects with audio information.
The option "Show only the visible objects" determines which objects from the list are visible in the current moment. In order the calculation to be correct you have to enter your observing site coordinates in Location settings tab.
The button "Add in ToDo" adds the selected object in the ToDo tab.
To change the list order click on the column you want to define the order.
Tips&Tricks Shift+Click on OK button will but in the clipboard the command #GoTo with the RA/Dec of the selected object.