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Find Objects The Find Objects command automatically detects stars based on brightness above background. This command can be used for quickly collecting objects for testing, to create an H-R diagram of field stars, or other purposes. Objects found by this command have the same status as manually marked photometry objects or objects imported using a photometry catalog. They can be saved as a catalog in the normal way using the Save As command in the (right-click) context menu of the photometry measurements table. To exclude cosmic rays, objects are rejected if they contain fewer than 4 pixels.
ExampleThe properties shown in the dialog above were used to run this command on one of the provided sample images. The result is shown below. A photometric zero point found in the image header is added to the raw magnitudes. In this case, there is no ZERO-PT keyword in the image header, so the value is taken as zero and the magnitudes are negative. The # and Index fields also differ (50 versus 60) because rejected objects are counted in the Index value but not included in the final list of 50 objects.
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