12.16 Cycle 28 Calibration Program

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The Cycle 28 calibration plans for COS continue the routine calibration and monitoring programs performed in previous Cycles. Brief descriptions of the programs are listed in Table 12.2. The full calibration plan for Cycle 28 is listed in Table 12.19. Two new contingency programs are introduced for this cycle and are included in the table below. The program COS FUV Change in Spectroscopic Sensitivity Trends is a supplement to the COS FUV Spectroscopic Sensitivity Monitor and is activated when the time-dependent sensitivity appears to be changing on short timescales. The COS FUV Characterization of Modal Gain When Changing High Voltage program is activated when the high voltage of the FUV detector is changed. In previous cycles, these contingency orbits were included in the COS FUV Spectroscopic Sensitivity Monitor and COS FUV Detector Gain Maps programs, respectively.

The program also included exploratory, enabling, and calibration programs designed to facilitate the move to Lifetime Position 5 (LP5); they are listed in Table 12.20. In addition, this program also included exploratory programs designed to facilitate the move to Lifetime Position 6 (LP6); they are listed in Table 12.21.


Table 12.19: Cycle 28 Calibration Programs.

Program NameProgram ID

Cycle 28 COS NUV MAMA Fold Distribution

16328

Cycle 28 COS NUV Detector Dark Monitor

16237

Cycle 28 COS NUV Spectroscopic Sensitivity Monitor

16329

Cycle 28 COS NUV Wavelength Scale Monitor

16330

Cycle 28 COS NUV Target Acquisition Monitor

16331

Cycle 28 COS FUV Detector Gain Maps

16323

Cycle 28 COS FUV Detector Dark Monitor

16322

Cycle 28 COS FUV Spectroscopic Sensitivity Monitor

16324

Cycle 28 COS FUV Wavelength Scale Monitor

16325

Cycle 28 COS FUV Target Acquisition Monitor16326
Cycle 28 COS FUV Change in Spectroscopic Sensitivity Trends*16332
Cycle 28 COS FUV Characterization of Modal Gain When Changing High Voltage*16333

*contingency program


Table 12.20: Lifetime Position 5 Calibration Program.

I. Optimize the New Lifetime PositionProgram ID 
COS/FUV Mapping of FCA Light Leak Between +5'' and +6''^15689
Testing for Systematics When Moving the COS Aperture Block*16052
Initial Test of COS/FUV Spectrum Placement at Lifetime Position 5*16106
II. Enable Science at the New Lifetime Position
Verification of Target Placement for COS at LP516430
Focus Sweep Program for COS FUV Observations at LP5 and LP316431
COS LP5 FUV Target Acquisition Enabling and Verification16432
III. Calibrate the New Lifetime Position
COS FUV LP5 Calibration: Profiles, Traces, Sensitivities, Flat Fields and Spatial Resolution16466
COS FUV LP5 Calibration: Spectral Resolution16467
COS FUV LP5 Calibration: Dispersion Solutions16468
COS FUV LP5 Calibration: Lamp Templates16469
COS FUV LP5 Calibration: Bright Object Aperture Performance16470
COS FUV LP5 Calibration: Gain Maps16471

^program executed in Cycle 26

*program executed in Cycle 27


Table 12.21: Lifetime Position 6 Exploratory Program.

Program NameProgram ID
COS/FUV Gain Map and Aperture Placement at LP616472
FUV Focus Sweep Exploratory Program for COS at LP616491
FUV Exploratory Spectral Resolution Program at LP616495

If your program requires calibrations beyond those described here, then you should explicitly include this calibration in your Phase I proposal.

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