15388( 4) - 05-Sep-2018 15:20:23 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 15388 Version: 4 Check-in Time: 05-Sep-2018 15:20:23 STScI Edit Number: 2 Title COS NUV Wavelength Scale Monitor ------------------------------------------------------------------------------------ Type Cycle CAL/COS 25 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. William J. Fischer Space Telescope Science Institute Y ------------------------------------------------------------------------------------ Abstract This program monitors the stability of the constant terms in the NUV dispersion solutions. To monitor for any changes, the program observes HD 6655 at selected cenwaves for the three NUV gratings that have seen use since Cycle 21. Via cross-correlation, spectra are compared to those obtained in previous iterations of the program and to STIS spectra obtained in-orbit. ------------------------------------------------------------------------------------ Observations Description ------------------------ To monitor the constant terms in the COS/NUV dispersion solutions in Cycle 25, we continue the approach of Cycle 24 program 14859. This includes taking spectra with the cenwaves 2635, 2950, and 3000 in G230L, cenwave 2217 in G225M, and cenwave 2010 in G185M. The previously monitored G285M grating was dropped from the program due to its declining sensitivity and lack of use since Cycle 21. All data are obtained at FP-POS 3. Due to past GS acquisition issues (e.g., Visit 02 of Cycle 22 program 13975; see HOPR 81649), we use an ACQ/SEARCH, ACQ/PEAKXD, and ACQ/PEAKD sequence. The available GS pairs need to be carefully vetted, as optimum target centering is critical to this program. The proper motions were modified to reflect the latest GAIA measurements. Data from previous iterations of this program were used to update the ETC calculations for Cycle 25. This program has been reduced to one visit in Cycle 25 from the previous two visits, since this has been deemed sufficient for the monitoring. To maintain a regular interval of about 12 months between visits, the program will ideally be carried out in the window that spans late August and early September 2018. The schedulability is set to 60% to fit all the observations in one orbit. ------------------------------------------------------------------------------------ 15388( 4) - 05-Sep-2018 15:20:23 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 HD-6655 STAR, F3-F9 RA=01H05M18.2073S +/- 0.1", J2000 V = 19.5 V = 8.05 +/- 0.05 DEC=-72D33'14.47" +/- 0.1" Reference Frame: ICRS Extended: NO Comments: This object was generated by the target selector and retrieved from the SIMBAD database. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 0.011007100119811902 -0.12 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 15388( 4) - 05-Sep-2018 15:20:23 - [ 3] Visit: 01 Visit Requirements: SCHED 60%; BETWEEN 15-AUG-2018:00:00:00 AND 30-SEP-2018:00:00:00 On Hold Comments: Additional Comments: The 31 day window in August/September 2018 is preferred to maintain a pattern of about 12 months between visits. The schedulability is set to 60% to fit all the observations in one orbit. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD-6655 COS/NUV ACQ/SEA PSA G230L 2635 SCAN-SIZE=3, STEP-SIZE=1.767, 1 1 S (1 S) GSPAIR RCH CENTER=FLUX-WT-FLR S0XG064488F2S0XJ067306F1 ------------------------------------------------------------------------------------------------------------------------------------ 2 HD-6655 COS/NUV ACQ/PEA PSA G230L 2635 STRIPE=MEDIUM 1 1 S (1 S) KXD ------------------------------------------------------------------------------------------------------------------------------------ 3 HD-6655 COS/NUV ACQ/PEA PSA G230L 2635 NUM-POS=5, STEP-SIZE=1, 1 1 S (1 S) KD CENTER=FLUX-WT-FLR ------------------------------------------------------------------------------------------------------------------------------------ 4 HD-6655 COS/NUV TIME-TA PSA G230L 2635 BUFFER-TIME=177, FP-POS=3 1 80 S (80 G S) ------------------------------------------------------------------------------------------------------------------------------------ 5 HD-6655 COS/NUV TIME-TA PSA G230L 2950 BUFFER-TIME=123, FP-POS=3 1 80 S (80 G S) ------------------------------------------------------------------------------------------------------------------------------------ 6 HD-6655 COS/NUV TIME-TA PSA G230L 3000 BUFFER-TIME=124, FP-POS=3 1 80 S (80 G S) ------------------------------------------------------------------------------------------------------------------------------------ 7 HD-6655 COS/NUV TIME-TA PSA G225M 2217 BUFFER-TIME=330, FP-POS=3 1 440 S (440 G S) ------------------------------------------------------------------------------------------------------------------------------------ 8 HD-6655 COS/NUV TIME-TA PSA G185M 2010 BUFFER-TIME=750, FP-POS=3 1 860 S (860 G S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ HD-6655 1 COS/NUV ACQ/SEA PSA G230L 2635 none none none none 1 N/A RCH HD-6655 2 COS/NUV ACQ/PEA PSA G230L 2635 none none none none 1 N/A KXD HD-6655 3 COS/NUV ACQ/PEA PSA G230L 2635 none none none none 1 N/A KD HD-6655 4 COS/NUV TIME-TA PSA G230L 2635 none none none none 1 N/A G HD-6655 5 COS/NUV TIME-TA PSA G230L 2950 none none none none 1 N/A G 15388( 4) - 05-Sep-2018 15:20:23 - [ 4] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ HD-6655 6 COS/NUV TIME-TA PSA G230L 3000 none none none none 1 N/A G HD-6655 7 COS/NUV TIME-TA PSA G225M 2217 none none none none 1 N/A G HD-6655 8 COS/NUV TIME-TA PSA G185M 2010 none none none none 1 N/A G 15388( 4) - 05-Sep-2018 15:20:23 - [ 5] Visit: 51 Visit Requirements: SCHED 60%; BETWEEN 15-AUG-2018:00:00:00 AND 30-SEP-2018:00:00:00 On Hold Comments: Additional Comments: The 31 day window in August/September 2018 is preferred to maintain a pattern of about 12 months between visits. The schedulability is set to 60% to fit all the observations in one orbit. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD-6655 COS/NUV ACQ/SEA PSA G230L 2635 SCAN-SIZE=3, STEP-SIZE=1.767, 1 1 S (1 S) GSPAIR RCH CENTER=FLUX-WT-FLR S0XG064488F2S0XJ067306F1 ------------------------------------------------------------------------------------------------------------------------------------ 2 HD-6655 COS/NUV ACQ/PEA PSA G230L 2635 STRIPE=MEDIUM 1 1 S (1 S) KXD ------------------------------------------------------------------------------------------------------------------------------------ 3 HD-6655 COS/NUV ACQ/PEA PSA G230L 2635 NUM-POS=5, STEP-SIZE=1, 1 1 S (1 S) KD CENTER=FLUX-WT-FLR ------------------------------------------------------------------------------------------------------------------------------------ 4 HD-6655 COS/NUV TIME-TA PSA G230L 2635 BUFFER-TIME=177, FP-POS=3 1 80 S (80 G S) ------------------------------------------------------------------------------------------------------------------------------------ 5 HD-6655 COS/NUV TIME-TA PSA G230L 2950 BUFFER-TIME=123, FP-POS=3 1 80 S (80 G S) ------------------------------------------------------------------------------------------------------------------------------------ 6 HD-6655 COS/NUV TIME-TA PSA G230L 3000 BUFFER-TIME=124, FP-POS=3 1 80 S (80 G S) ------------------------------------------------------------------------------------------------------------------------------------ 7 HD-6655 COS/NUV TIME-TA PSA G225M 2217 BUFFER-TIME=330, FP-POS=3 1 440 S (440 G S) ------------------------------------------------------------------------------------------------------------------------------------ 8 HD-6655 COS/NUV TIME-TA PSA G185M 2010 BUFFER-TIME=750, FP-POS=3 1 860 S (860 G S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ HD-6655 1 COS/NUV ACQ/SEA PSA G230L 2635 none none none none 1 N/A RCH HD-6655 2 COS/NUV ACQ/PEA PSA G230L 2635 none none none none 1 N/A KXD HD-6655 3 COS/NUV ACQ/PEA PSA G230L 2635 none none none none 1 N/A KD HD-6655 4 COS/NUV TIME-TA PSA G230L 2635 none none none none 1 N/A G HD-6655 5 COS/NUV TIME-TA PSA G230L 2950 none none none none 1 N/A G 15388( 4) - 05-Sep-2018 15:20:23 - [ 6] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ HD-6655 6 COS/NUV TIME-TA PSA G230L 3000 none none none none 1 N/A G HD-6655 7 COS/NUV TIME-TA PSA G225M 2217 none none none none 1 N/A G HD-6655 8 COS/NUV TIME-TA PSA G185M 2010 none none none none 1 N/A G 15388( 4) - 05-Sep-2018 15:20:23 - [ 7] Summary Form for Proposal 15388 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures PSA ------------------------------------------------------------------------------------------------------------------------------------ Configurations COS/NUV ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ/PEAKD, ACQ/PEAKXD, ACQ/SEARCH, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=123, BUFFER-TIME=124, BUFFER-TIME=177, BUFFER-TIME=330, BUFFER-TIME=750, CENTER=FLUX-WT-FLR, FP-POS=3, NUM-POS=5, SCAN-SIZE=3, STEP-SIZE=1, STEP-SIZE=1.767, STRIPE=MEDIUM ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BETWEEN 15-AUG-2018:00:00:00 AND 30-SEP-2018:00:00:00, GSPAIR S0XG064488F2S0XJ067306F1, SCHED 60% ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G185M, G225M, G230L ------------------------------------------------------------------------------------------------------------------------------------ Target Names HD-6655 ------------------------------------------------------------------------------------------------------------------------------------