Op 1-6-2011 19:51, Björn Gimle schreef: > I saw their wording as implying that that they take several exposures with a > fixed camera, so that they have more star trails close to the object > position to measure, and more positions for the object (possibly also > moving). That makes no sense at all. With modern astrometric catalogues now going very deep, there never is a shortage of available reference stars even when the FOV is very small. Seeing and pixel resolution of the image (and stability of the mount) is what determines the quality of astrometry with modern astrometric software. Wirh satellite imagery, a good time control, is a more important factor than the astrometry, even with small equipment. - Marco ----- Dr Marco Langbroek - SatTrackCam Leiden, the Netherlands. e-mail: sattrackcam@wanadoo.nl Cospar 4353 (Leiden): 52.15412 N, 4.49081 E (WGS84), +0 m ASL Cospar 4354 (De Wilck): 52.11685 N, 4.56016 E (WGS84), -2 m ASL SatTrackCam: http://home.wanadoo.nl/marco.langbroek/satcam.html Station (b)log: http://sattrackcam.blogspot.com ----- _______________________________________________ Seesat-l mailing list http://mailman.satobs.org/mailman/listinfo/seesat-l
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