User manual SBIG ST-4

[. . . ] Model ST-4 Star Tracker Imaging Camera Operating Manual Table of Contents Instrument Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 1 Star Tracking Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 4 Imaging Camera Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 8 Host Computer Software Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] Each of the commands in the Crosshair Menu and their effects are discussed below. Each command can be executed by pressing the key corresponding to the first letter or character in that command. Star Executing this command fixes the reference position for the Separation and Angle measurements at the current position of the Crosshair. Centroid This command is like the Star command above, but higher accuracy positioning of the reference is achieved for stellar objects by determining the center to subpixel accuracy. SBIG ST-4/0489 SANTA BARBARA INSTRUMENT GROUP Background This command records the background level used in the magnitude calculations to the average value of the pixels inside the box centered under the current position of the Crosshair. Toggle box size Executing this command toggles the boxsize used in the average pixel, magnitude, and diffuse magnitude calculations through the possible values of 3 x 3 through 11 x 11. The program goes back to the image point where a background measurement was last made and makes another reading at the new box size when this command is executed. +Mag, -Mag These commands modify the image's calibration factor so that the calculated magnitude can be corrected as required for stars of known magnitude. The SHIFT + and SHIFT - keys change the magnitude by 0. 01 magnitude, while the unshifted keys (= and -) change it by 0. 1 magnitude. The keys on the numeric keypad work differently. The calibration factor can be expected to vary slightly with the transparency of the night, or the elevation angle of the stars. Atmospheric absorption is a significant factor when accurate measurements are desired Esc When the ESC key is pressed in Crosshair Mode the program exits that mode and returns to Display Mode. Zoom Mode When Zoom Mode is entered, a zoom-box is drawn superimposed on the image and the Display Menu is replaced with the Zoom Menu. The zoom-box can be moved around on the image using the same keys used to move the Crosshair (cursor keys and 2, 4, 6, and 8). When the zoom-box is positioned appropriately, pressing the ENTER key causes the image data within the zoom-box to be expanded to the size of a full image. The newly zoomed image is displayed, and Display Mode is entered. Pressing the ESC key while in Zoom Mode Page 23 SBIG merely cancels that mode and returns to Display Mode without performing the zoom. Zooming actually replaces the image data in memory with the zoomed image. If the CCD program has enough memory, the un-zoomed image is retained, and the image can be unzoomed later by invoking the Zoom command a second time (unless the zoomed image is saved to disk in which case the un-zoomed image is discarded). If there isn't enough memory, you will have been warned when the CCD program was first started. SANTA BARBARA INSTRUMENT GROUP Note: Some graphics adapters will support multiple modes such as VGA adapters that will also do CGA and EGA emulation. These adapters can be used in any of their supported modes. Also, each supported graphics adapter requires a BGI file in the same directory as the CCD program. For example CGA mode requires the CGA. BGI file. [. . . ] 1, 16 RS-422. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 S Schmidt Cassegrain telescope (SCT). . . . . . . . . . . . . . . . . . . . 2 Scribing the eyepiece. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Separations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ]