ASTROMETRY CLUB SOFTWARE
The sequence of events is that the user loads the FITS format image into CCDSoft with north at the top and with The Sky software also running. However, if the image is upside down or the image scale is wrong or the field is particularly barren, a successful match may not occur. In other words, if the user ensures that the image has north at the top and the image scale in arc-seconds per pixel is correct and the user supplies the correct right ascension/declination information, there is a good chance that the stars in the database of The Sky can be matched to the stars in the FITS format image. The integration between The Sky and CCDSoft enables automatic field recognition to work (usually!). The aforementioned Software Bisque CCDSoft program will carry out accurate astrometry. Thankfully those days are now gone, and it is a formality to measure a new object's position on a CCD image with software and a digital star catalogue. Years ago, astrometric measurement was a tedious process involving a measuring engine that precisely measured the positions of stars on glass plates by using x and y motions controlled by micrometer barrels as the measurer viewed the plate through a microscope fitted with crosshairs. An astrometric measurement is essential when you report your discovery to CBAT (Central Bureau for Astronomical Telegrams). Astrometry is the science of measuring the precise position of an astronomical object with reference to the surrounding stars.
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