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Implementation Overrides

Implementation Overrides. Changed Sun avoidance angle from 50.25 degrees to 46.0 degrees for Venus obsets . Suppressed OBAD at the beginning of Venus visit 02 to preserve scheduling spot after recent HST ephemeris change. OBADs normally occur when computed position uncertainty is >70”.

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Implementation Overrides

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  1. Implementation Overrides • Changed Sun avoidance angle from 50.25 degrees to 46.0 degrees for Venus obsets. • Suppressed OBAD at the beginning of Venus visit 02 to preserve scheduling spot after recent HST ephemeris change. • OBADs normally occur when computed position uncertainty is >70”. • Computed position uncertainty is 91” for visit 02. • Increased guide star acquisition time to allow for extra uncertainty.

  2. Implementation Overrides • Disabled moving target tracking and parallax correction for Venus offset pointings in Venus visits. • Changed guide star request parameters • Obsets A1 (Venus), A2 (Venus), and 10 (GS aq. test) • primary single spoiler radius from 75” to 47” • Obsets A4 (Venus) and 11 (GS acq. test) • Off –nominal roll from 30 degrees to 5 degrees • Primary single spoiler radius from 75” to 39” • Primary double spoiler radius from 75” to 49”

  3. Implementation Overrides • Changed guide star request parameters • Obsets 05 (Venus offset) and 06 (Venus offset) • Off –nominal roll from 30 degrees to 5 degrees • Obset A5 (Venus) • Off-nominal roll from 30 degrees to 5 degrees • Primary single spoiler from 75” to 47” • Ignore Earth avoidance constraint for post-Venus offset pointing. • Just a gyro pointing • No science happening

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