Hi Bev, The task consists of obtaining plate coefficients for either stars or star trails; and determining coordinates relative to the obtained plate solution for an object (satellite), which will be either a point or a trail. The problem is (and here's the difference with e.g. asteroids) that one or both of both categories (satellite or stars) will be trails usually. Would this not be the case, i.e. would it concern point sources only, then regular astrometry software like Astrometrica or several of the other available astrometry software suites would do well. For LEO objects the satellite will always be a trail. Stars might be point sources if guided, but personally I work unguided as the equipment in my case consists simply of a DSLR on camera tripod. For GEO sats either the satellite will be a point and the stars trailed (unguided CCD): or the satellite a trail and the stars points (guided CCD). Usually it will be the first option as this allows fainter satellites to be captured. Other HEO objects (e.g. Molniya's) will always be trails, and depending on the method the stars will be trails or points, like LEO objects. Also note that usually the original file format will not be FITS, as most camera observers use a video camera or in my case a DSLR. Only for GEO sats some use CCD. - Marco Ted Molczan schreef: > I am forwarding this message to the list. > > Ted Molczan > > > -----Original Message----- > From: Bev M Ewen-Smith [bmes at coaa.co.uk] > Sent: March 27, 2009 3:21 PM > To: SeeSat-L@satobs.org > Subject: Re: Satellite Elements from Astrometric Observation. > > Hi, > > I am new to this application, but is this just a matter of > calibrating the plate coefficients of an image using, say GSC start > positions, and then making astrometric measurements of a specific > object/point in the image, that is required? If so, my FitsX (not > very recent) program does that. www.coaa.co.uk/fitsx.htm > > I probably shouldn't say so, but the plate calibration process is > done even more cleverly by Alfonso Pulido's Elbrus > (http://tech.groups.yahoo.com/group/StarLocatorElbrus/) which works > out what you are looking at, without even needing to tell it where in > the sky it is. > > Regards > Bev > COAA ------------------------------------------------------------------------- Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: http://www.satobs.org/seesat/seesatindex.html
This archive was generated by hypermail 2b29 : Sat Mar 28 2009 - 14:50:48 UTC