9619( 5) - 06/17/02 11:57 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 9619 Version: 5 Check-in Date: 17-Jun-2002 11:56:25 1.Proposal Title: Echelle Blaze Shift vs. MSM Monthly Offset ------------------------------------------------------------------------------------ 2. Proposal For 3. Cycle CAL/STIS 11 ------------------------------------------------------------------------------------ 4. Investigators Contact? PI: Jeff Valenti Space Telescope Science Institute CoI: Jessica Kim Space Telescope Science Institute N ------------------------------------------------------------------------------------ 5. Abstract In the near future, monthly MSM offsets will probably be disabled for STIS echelle gratings, alleviating to some extent calibration problems associated with the monthly offsets. The data from this program will be used to improve empirical and optical models relating wavelength and blaze function shifts. These models will in turn be used to improve the calibration of archival echelle data obtained while monthly MSM offsets were enabled. The flux standard HZ43 will be observed with the E230H echelle grating at a central wavelength of 2513 Angstroms. Five exposures will be obtained, each with a different monthly offset applied to the Mode Select Mechanism (MSM). ------------------------------------------------------------------------------------ 9619( 5) - 06/17/02 11:57 - [ 2] Observations Description ------------------------ The flux standard HZ43 will be observed with the E230H echelle grating at a central wavelength of 2513 Angstroms. Five exposures will be obtained, each with a different monthly offset applied to the Mode Select Mechanism (MSM). The selected months (Aug, Oct, Dec, Apr, and Jul) scan through the full range of offsets in the echelle dispersion direction. Hence, the observations will also scan through the full range of echelle blaze function shifts. The expected wavelength shifts range from [dX, dY] = [+2,+28] to [dX, dY] = [+2,+28] to [-2, -33] pixels. The corresponding blaze function shifts are expected to range from [-10,+15] pixels. Restricted commanding will be used to select MSM offsets for different months all within a single orbit. RPS2 auto-wavecal logic does not recognize the need for wavecals at each new MSM offset, and deeper wavecals will also allow a better characterization of wavelength shifts. Thus, WAVECAL=NO is used to suppress auto-wavecals. Wavecals (TARGET=NONE, LAMP=LINE) are inserted manually. Placing the wavecals before each external observation seems to yield the best orbit packing. Choosing a wavecal exposure time of at least 140 seconds generally allows STIS buffer dumps in parallel with the wavecal. In order to facilitate execution of this program prior to inhibition of MSM offsets, SCHEDulability is set to 100%. The constraint BEFORE JUN-30- 2002 is intended to encourage the earliest possible execution, so that this program will execute before commanding work disables monthly MSM offsets. If for some reason execution is delayed beyond JUL-31-2002, then G191B2B should be used instead of HZ43. The SCHED 100% constraint limits exposure times to 680 seconds, yielding a peak S/N ratio of 11.3 per resolution element. This S/N ratio is adequate to fit sensitivity curves with an accuracy approaching 0.1% for all echelle orders. For analysis convenience, MAX DUR is used to keep all the exposures the same length. The exposures may be lengthened, if target visibility permits, but it is not necessary. Using the standard star spectrum for HZ43 in the exposure time calculator, the predicted count rates are 5303 counts/sec global and 0.0511 counts/sec/pixel local, both of which are well below the screening limits. Moreover, the target has been observed previously without difficulty in the identical configuration in program 8595. For each 680 second exposure, the ETC predicts a S/N ratio of 11.3 per resolution element. Real Time Justification ----------------------- Calibration Justification ------------------------- The data from this program will be used to improve empirical and optical models relating wavelength and blaze function shifts. These models will in turn be used to improve the calibration of archival echelle data obtained while monthly MSM offsets were enabled. Additional Comments ------------------- ------------------------------------------------------------------------------------ 9619( 5) - 06/17/02 11:57 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 HZ43 STAR, DA, CALIBRATION RA=13H 16M 21.99S +/- 0S, J2000 V = 12.91 DEC=29D 5' 57.0" +/- 0", PLATE- B-V = -0.31 ID=002K F(1200)=4.7e-12 F(1800)=1.3e-12 F(2500)=4.1e-13 Coordinate Source: GUIDE_STAR_CATALOG Comments: V from Bohlin et al. (in prep) PM values from Bohlin et al. 1995, AJ, 110, 1316; UV fluxes obtained from http://garnet.stsci.edu/STIS/ETC/stis_models.html#stan dards Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 1982.39 -0.0116 -0.0813 0.0155 2 BD+28D4211 STAR, SDO, CALIBRATION, RA=21H 51M 11.07S +/- 0S, J2000 V = 10.516+/-.04 INSTRUMENT SENSITIVITY DEC=28D 51' 51.8" +/- 0", PLATE- B-V = -0.34 TEST ID=01LR F(2000)=9.4208+/-.001e-12 Coordinate Source: GUIDE_STAR_CATALOG 9619( 5) - 06/17/02 11:57 - [ 4] Visit: 10 Visit Priority: Visit Requirements: SCHED 100% BEFORE 30-JUN-2002 On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 10 HZ43 STIS/C ACQ F28X50L MIRROR 1 0.4 S CD P Comments: Expect S/N=105, peak 6940 electrons ------------------------------------------------------------------------------------------------------------------------------------ 20 HZ43 STIS/C ACQ/PEA 0.2X0.2 MIRROR 1 0.2 S CD K Comments: Expect S/N=191, peak 7150 electrons ------------------------------------------------------------------------------------------------------------------------------------ 30 NONE STIS MSMOFF SETOFFSET=0800,GRATING1=E230H 1 DEF Comments: Expect dX, dY of +2,+28 pixels ------------------------------------------------------------------------------------------------------------------------------------ 40 NONE STIS/N ACCUM 0.1X0.0 E230H 2513 LAMP=LINE 1 140 S UV-MAM 9 A Comments: Wavecal for 1st MSM offset ------------------------------------------------------------------------------------------------------------------------------------ 50 HZ43 STIS/N ACCUM 0.2X0.2 E230H 2513 WAVECAL=NO 1 680 S MAX DUR UV-MAM A Comments: Spectrum at 1st MSM offset ------------------------------------------------------------------------------------------------------------------------------------ 60 NONE STIS MSMOFF SETOFFSET=1000,GRATING1=E230H, 1 DEF WAVELENGTH=2513 Comments: Expect dX, dY of +1,+16 pixels ------------------------------------------------------------------------------------------------------------------------------------ 70 NONE STIS/N ACCUM 0.1X0.0 E230H 2513 LAMP=LINE 1 140 S UV-MAM 9 A Comments: Wavecal for 2nd MSM offset ------------------------------------------------------------------------------------------------------------------------------------ 80 HZ43 STIS/N ACCUM 0.2X0.2 E230H 2513 1 680 S MAX DUR UV-MAM A Comments: Spectrum at 2nd MSM offset ------------------------------------------------------------------------------------------------------------------------------------ 90 NONE STIS MSMOFF SETOFFSET=1200,GRATING1=E230H, 1 DEF WAVELENGTH=2513 Comments: Expect dX, dY of 0, 0 pixels ------------------------------------------------------------------------------------------------------------------------------------ 100 NONE STIS/N ACCUM 0.1X0.0 E230H 2513 LAMP=LINE 1 140 S UV-MAM 9 A Comments: Wavecal for 3nd MSM offset ------------------------------------------------------------------------------------------------------------------------------------ 9619( 5) - 06/17/02 11:57 - [ 5] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 110 HZ43 STIS/N ACCUM 0.2X0.2 E230H 2513 1 680 S MAX DUR UV-MAM A Comments: Spectrum at 3rd MSM offset ------------------------------------------------------------------------------------------------------------------------------------ 120 NONE STIS MSMOFF SETOFFSET=0400,GRATING1=E230H, 1 DEF WAVELENGTH=2513 Comments: Expect dX, dY of -1,-16 pixels ------------------------------------------------------------------------------------------------------------------------------------ 130 NONE STIS/N ACCUM 0.1X0.0 E230H 2513 LAMP=LINE 1 140 S UV-MAM 9 A Comments: Wavecal for 4th MSM offset ------------------------------------------------------------------------------------------------------------------------------------ 140 HZ43 STIS/N ACCUM 0.2X0.2 E230H 2513 1 680 S MAX DUR UV-MAM A Comments: Spectrum at 4th MSM offset ------------------------------------------------------------------------------------------------------------------------------------ 150 NONE STIS MSMOFF SETOFFSET=0700,GRATING1=E230H, 1 DEF WAVELENGTH=2513 Comments: Expect dX, dY of -2,-33 pixels ------------------------------------------------------------------------------------------------------------------------------------ 160 NONE STIS/N ACCUM 0.1X0.0 E230H 2513 LAMP=LINE 1 140 S UV-MAM 9 A Comments: Wavecal for 5th MSM offset ------------------------------------------------------------------------------------------------------------------------------------ 170 HZ43 STIS/N ACCUM 0.2X0.2 E230H 2513 1 680 S MAX DUR UV-MAM A Comments: Spectrum at 5th MSM offset ------------------------------------------------------------------------------------------------------------------------------------ 180 NONE STIS MSMOFF SETOFFSET=RESTORE,GRATING1=E230H 1 DEF Comments: Restore MSM settings for current month ------------------------------------------------------------------------------------------------------------------------------------ 9619( 5) - 06/17/02 11:57 - [ 6] Visit: 50 Visit Priority: Visit Requirements: SCHED 100% BEFORE 30-AUG-2002 On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 10 BD+28D4211 STIS/C ACQ F28X50O MIRROR 1 5.0 S CD II Comments: Expect S/N=100 ------------------------------------------------------------------------------------------------------------------------------------ 20 BD+28D4211 STIS/C ACQ/PEA 0.2X0.2 MIRROR 1 0.1 S CD K Comments: Expect S/N=191, peak 7150 electrons ------------------------------------------------------------------------------------------------------------------------------------ 30 NONE STIS MSMOFF SETOFFSET=0800,GRATING1=E230H 1 DEF Comments: Expect dX, dY of +2,+28 pixels ------------------------------------------------------------------------------------------------------------------------------------ 40 NONE STIS/N ACCUM 0.1X0.0 E230H 2513 LAMP=LINE 1 140 S UV-MAM 9 A Comments: Wavecal for 1st MSM offset ------------------------------------------------------------------------------------------------------------------------------------ 50 BD+28D4211 STIS/N ACCUM 0.2X0.2 E230H 2513 WAVECAL=NO 1 680 S MAX DUR UV-MAM A Comments: Spectrum at 1st MSM offset ------------------------------------------------------------------------------------------------------------------------------------ 60 NONE STIS MSMOFF SETOFFSET=1000,GRATING1=E230H, 1 DEF WAVELENGTH=2513 Comments: Expect dX, dY of +1,+16 pixels ------------------------------------------------------------------------------------------------------------------------------------ 70 NONE STIS/N ACCUM 0.1X0.0 E230H 2513 LAMP=LINE 1 140 S UV-MAM 9 A Comments: Wavecal for 2nd MSM offset ------------------------------------------------------------------------------------------------------------------------------------ 80 BD+28D4211 STIS/N ACCUM 0.2X0.2 E230H 2513 1 680 S MAX DUR UV-MAM A Comments: Spectrum at 2nd MSM offset ------------------------------------------------------------------------------------------------------------------------------------ 90 NONE STIS MSMOFF SETOFFSET=1200,GRATING1=E230H, 1 DEF WAVELENGTH=2513 Comments: Expect dX, dY of 0, 0 pixels ------------------------------------------------------------------------------------------------------------------------------------ 100 NONE STIS/N ACCUM 0.1X0.0 E230H 2513 LAMP=LINE 1 140 S UV-MAM 9 A Comments: Wavecal for 3nd MSM offset ------------------------------------------------------------------------------------------------------------------------------------ 9619( 5) - 06/17/02 11:57 - [ 7] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 110 BD+28D4211 STIS/N ACCUM 0.2X0.2 E230H 2513 1 680 S MAX DUR UV-MAM A Comments: Spectrum at 3rd MSM offset ------------------------------------------------------------------------------------------------------------------------------------ 120 NONE STIS MSMOFF SETOFFSET=0400,GRATING1=E230H, 1 DEF WAVELENGTH=2513 Comments: Expect dX, dY of -1,-16 pixels ------------------------------------------------------------------------------------------------------------------------------------ 130 NONE STIS/N ACCUM 0.1X0.0 E230H 2513 LAMP=LINE 1 140 S UV-MAM 9 A Comments: Wavecal for 4th MSM offset ------------------------------------------------------------------------------------------------------------------------------------ 140 BD+28D4211 STIS/N ACCUM 0.2X0.2 E230H 2513 1 680 S MAX DUR UV-MAM A Comments: Spectrum at 4th MSM offset ------------------------------------------------------------------------------------------------------------------------------------ 150 NONE STIS MSMOFF SETOFFSET=0700,GRATING1=E230H, 1 DEF WAVELENGTH=2513 Comments: Expect dX, dY of -2,-33 pixels ------------------------------------------------------------------------------------------------------------------------------------ 160 NONE STIS/N ACCUM 0.1X0.0 E230H 2513 LAMP=LINE 1 140 S UV-MAM 9 A Comments: Wavecal for 5th MSM offset ------------------------------------------------------------------------------------------------------------------------------------ 170 BD+28D4211 STIS/N ACCUM 0.2X0.2 E230H 2513 1 680 S MAX DUR UV-MAM A Comments: Spectrum at 5th MSM offset ------------------------------------------------------------------------------------------------------------------------------------ 180 NONE STIS MSMOFF SETOFFSET=RESTORE,GRATING1=E230H 1 DEF Comments: Restore MSM settings for current month ------------------------------------------------------------------------------------------------------------------------------------ 9619( 5) - 06/17/02 11:57 - [ 8] Summary Form for Proposal 9619 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures F28X50LP 0.2X0.2 0.1X0.09 F28X50OII ------------------------------------------------------------------------------------------------------------------------------------ Configurations STIS/CCD STIS STIS/NUV-MAMA ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ ACQ/PEAK MSMOFF ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters SETOFFSET=0800 GRATING1=E230H LAMP=LINE WAVECAL=NO WAVELENGTH=2513 SETOFFSET=1200 SETOFFSET=0400 SETOFFSET=0700 SETOFFSET=RESTORE SETOFFSET=1000 ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category CAL/STIS ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements SCHED 100% BEFORE 30-JUN-2002 MAX DUR SCHED 100% BEFORE 30-AUG-2002 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements MIRROR E230H ------------------------------------------------------------------------------------------------------------------------------------ Target Names HZ43 NONE BD+28D4211 ------------------------------------------------------------------------------------------------------------------------------------ Wavelengths 2513 ------------------------------------------------------------------------------------------------------------------------------------