Thanks to several of you for the numerous useful replies. No one has come forward with a pointer to an explanation for IMPULSIVE TIG (GMT) M50 DVx(FPS) LVLH DVx(FPS) DVmag(FPS) IMPULSIVE TIG (MET) M50 DVy(FPS) LVLH DVy(FPS) Invar Sph HA DT M50 DVz(FPS) LVLH DVz(FPS) Invar Sph HP which is habitually found at http://spaceflight.nasa.gov/realdata/sightings/SSa pplications/Post/JavaSSOP/orbit/SHUTTLE/SVPOST.html Thus, I propose that we should create one, and based largely on your input, offer the following first draft: TIG time of ignition ?? GMT obsolete time, closely proximate to UTC MET Mission Elapsed Time, useful if times have not been updated to reflect delayed launch Dates are given in January form (often mistakenly called Julian date) DT ?? could be delta time, meaning duration of burn, but if so, in the example I gave, the longer burn would result in the lesser DVmag(FPS) could be a window ?? M50 ECI coordinates for Mean Equator, Mean Equinox of Besselian Year 1950. ECI ?? LVLH local vertical, local horizontal DV DELTA Velocity DVx DV along x-coordinate DVy DV along y-coordinate DVz DV along z-coordinate x for LVLH, is direction of motion z for LVLH, is toward Earth y for LVLH, is other dimension (which direction??) x for M50 , is ?? vernal equinox ?? y for M50 , is ?? z for M50 , is ?? North pole of equator ?? FPS feet per second, in obsolete Imperial system of units Hasn't NASA already lost enough spacecraft because of its tolerance of use of obsolete units by contractors? DVmag DELTA Velocity magnitude , total DV along all axes (??) If so, for those of you still working on analytic geometry, then DVmag = sqrt ( DVx ^ 2 + DVy ^ 2 + DVz ^ 2 ) Invar Invariant ?? Sph Spheroid ?? HA Height of Apogee in nautical miles Hasn't NASA already lost enough spacecraft because of its tolerance of use of obsolete units by contractors? Height refers to elevation above mean sea level HA Height of Perigee in nautical miles Are the epochs given in the various initial elsets that of the next ascending equator crossing following the impulse? (Should there appear in here various references to parts of the FAQ?) Cheers. Walter Nissen ----------------------------------------------------------------- Unsubscribe from SeeSat-L by sending a message with 'unsubscribe' in the SUBJECT to SeeSat-L-request@lists.satellite.eu.org http://www2.satellite.eu.org/seesat/seesatindex.html
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