16908

This program determines the dispersion solutions for the FUV G160M grating at LP6. It observes the K2V emission-line star epsilon Eridani with all six G160M cenwaves. The G160M dispersion solutions are linear comma so we will derive updated dispersion coefficients and zero points. Visit 01 observes with cenwaves 1533 comma 1577 comma and 1589. Visit 02 observes with cenwaves 1600 comma 1611 comma and 1623. Both visits start with a double ACQ-IMAGE for improved target centering comma using the BOA and MirrorB. The exposure times and the number of orbits requested are driven by the number of counts needed to achieve good cross-correlations using multiple chromospheric emission lines. We need to achieve at least S-N virgul 5 in the peaks of weaker emission lines. This is achieved with one orbit per cenwave. The dispersion coefficients of intermediate cenwaves can be constrained by those of shorter and longer ones comma so these can accommodate the reduced exposure time that comes from sharing an orbit with the acquisition sequence.