eht@cs.cmu.edu wrote >nice to have a definition that took into account the expected satellite >magnitude (if available). Something like for a mag Y satellite, the sun >must be at least X degrees below the horizon where Y is estimated the usual >ways and X is computed from Y in some way. > There were two programs in a recent Sky&Telescope, now available on their website, to compute the limit magnitude at a any specific point of time, and the CCD limit magnitude, give data like date, time, observer lat/lon and altitude, Sun and Moon position, object position (and the angles between them!), atmospheric condition ... Unfortunately NONE of these values is computed - they are program constants, or runtime input. It would be nice to have the routine integrated into a magnitude-edtimating program like QuickSat (though it might slow it down noticably) or SkyMap. --------------------------------------------------------------- -- bjorn.gimle@tieto.com (office) b_gimle@algonet.se (home) -- -- 59.2237N, 18.2286E, 44 m http://www.algonet.se/~b_gimle -- -- SeeSat-L / Visual Satellite Observer Home Page found at -- -- http://www.satellite.eu.org/satintro.html -- ---------------------------------------------------------------