On my question: > > We in Belgium and Netherlands like to try and observe Rosetta > > during its fly-by. Therefore we need positions of this > > spacecraft with respect to the starry sky and predicted for > > our specific locations. Who knows how to obtain these? I got a very helpful reply from Ted Molczan and others: > Go to: http://ssd.jpl.nasa.gov/cgi-bin/eph > I went to this URL and was able to calculate topocentric predictions. They look great. The only thing I missed was specification of stellar magnitude. Who can tell me the formula to calculate the stellar magnitude from a self defined absolute magnitude (phase 90° and distance 1000 km), range and sun-target-observer angle? Another question: what might be a reasonable value for Rosetta's standard magnitude? Thanks in advance, Bram Dorreman COSPAR 4160 51° 16' 45.5" N 5° 28' 36.6" E (WGS84) 35 m ------------------------------------------------------------------------- Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: http://www.satobs.org/seesat/seesatindex.html
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