This transcription has been completed. Contact us with corrections.
STS-7 Day/Night Cycles Launch: 20 Apr 83 1100 GMT Ascending nodes move ~22.5 W [ [[Therefore]] cross equator @ ~same LCL time] Every 31 orbits (~46 hrs) ~overlap (2 3/4[[degrees]] E of previous) [tracks ~60 nm's apart] [[sketch]] Orbital Period = 90 1/3 min (165 nm's) [Note: shuttle will cross a given latitude at the same local time on every orbit (this time gets later by ~ 1 hr every 24 hrs)] 5 AUG - telecon with MBB (Manfred, Tony, Bern) Attitude Control System: - in all modes except "inertial mnvr", if RF link is dropped, SPAS will go to INRTL Hold. If SPAS was in INRTL mnvr, SW remembers this, & goes into "Bar-beque" mode, inertial rotation. - "Null attitude" command = SPAS SW computes required eigenaxis rotation, & mnvrs about that axis at 65 [[crossed out]] 5 [/crossed out] deg per sec [it recomputes eigenaxis every second, & fires jets so as to maintain ~ .5 deg per sec] - "STOP" cmd = sends SW to "HOLD" mode, which 1st looks at rates, sees they're outside rate db [[?]], & fires