14179( 3) - 04-Dec-2015 20:29:59 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 14179 Version: 3 Check-in Time: 04-Dec-2015 20:29:59 STScI Edit Number: 0 Title FUVB Flat Fields for the COS FUV Blue Modes ------------------------------------------------------------------------------------ Type Cycle GO 23 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Derck L. Massa Space Science Institute Y CoI: Dr. Steven V. Penton Space Telescope Science Institute N ------------------------------------------------------------------------------------ Abstract We are requesting 2 orbits to obtain the data needed to produce 1-D flat fields for the COS FUV blue modes (CENWAVE = 1055, 1096). We use data obtained in a previous calibration program to demonstrate that the 1-D flats currently used by the COS team to correct the grid-wire shadows in the FUV channels are inappropriate for the "blue modes". Unfortunately, only the FUVA data from the previous program are adequate to create new 1-D flats. FUVB 1-D flats are needed for two reasons. First, they are essential for high signal-to-noise observations of any object below 1150 Ang, including hot stars, objects with strong emission lines below 1150 Ang, and the rich interstellar spectrum that lies below 1150 Ang. Further, blue mode FUVB data are typically obtained with the FUVA off. This means that wavelength calibrations must be done separately and can result in crippling overheads if a full complement of FPPOS observations are obtained. However, different FPPOS settings are needed to suppress the fixed pattern noise in the COS FUV detectors. Application of a high quality 1-D flat will minimize the effect of the fixed pattern noise, reducing the number of WAVCALs needed and increasing the efficiency of the instrument. Finally, blue mode FUVB data are now the only medium resolution modes lacking high quality 1-D flats. ------------------------------------------------------------------------------------ Observations Description ------------------------ Obtain high S/N COS FUV data to construct FUVB P-flats for the blue modes. ------------------------------------------------------------------------------------ 14179( 3) - 04-Dec-2015 20:29:59 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 2 G191B2B STAR, DA RA=05H05M30.6700S +/- 0.1", J2000 V = 11.69 DEC=+52D49'51.95" +/- 0.1" Reference Frame: ICRS Extended: NO Comments: Coordinates and proper motions are form COS TIR 2009-02(v2) This object was generated by the targetselector and retrieved from the SIMBAD database.This object was generated by the targetselector 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 0.00071 -0.09070 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 14179( 3) - 04-Dec-2015 20:29:59 - [ 3] Visit: 02 Visit Requirements: On Hold Comments: Additional Comments: 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 G191B2B COS/NUV ACQ/IMA BOA MIRRORB 1 25 S (25 GE S) Comments: This TA is a duplicate of two previous ACQ/IMAGES of this target. These 25 second TAs had ~5404 counst; S/N = ~70. Target Brightest Pixel = 1.7 counts/s ------------------------------------------------------------------------------------------------------------------------------------ 2 G191B2B COS/FUV TIME-TA PSA G130M 1096 SEGMENT=B, BUFFER-TIME=312, 1 1350 S G FP-POS=1 (1350 S) Comments: From the ETC run, the Buffer time should be less than 2.35E6/4088. * (2/3.) < 383.2. For 1350s, the best buffer time is (1350-100)/4 = 312 s ------------------------------------------------------------------------------------------------------------------------------------ 3 G191B2B COS/FUV TIME-TA PSA G130M 1096 SEGMENT=B, BUFFER-TIME=275, 1 1200 S G FP-POS=2 (1200 S) Comments: From the ETC run, the Buffer time should be less than 2.35E6/4088. * (2/3.) < 383.2. For 1200s, the best buffer time is (1350-100)/4 = 275 s ------------------------------------------------------------------------------------------------------------------------------------ 4 WAVE COS/FUV TIME-TA WCA G130M 1096 FP-POS=2, SEGMENT=BOTH 1 DEF (0 S) G ------------------------------------------------------------------------------------------------------------------------------------ 5 G191B2B COS/FUV TIME-TA PSA G130M 1096 SEGMENT=B, BUFFER-TIME=312, 1 160 S (160 G FP-POS=2 S) Comments: From the ETC run, the Buffer time should be less than 2.35E6/4088. * (2/3.) < 383.2. We used 312 s for others, so we'll just use that one here as well. ------------------------------------------------------------------------------------------------------------------------------------ 6 G191B2B COS/FUV TIME-TA PSA G130M 1096 SEGMENT=B, BUFFER-TIME=312, 1 1350 S G FP-POS=3 (1350 S) Comments: From the ETC run, the Buffer time should be less than 2.35E6/4088. * (2/3.) < 383.2. For 1350s, the best buffer time is (1350-100)/4 = 312 s ------------------------------------------------------------------------------------------------------------------------------------ 14179( 3) - 04-Dec-2015 20:29:59 - [ 4] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 7 G191B2B COS/FUV TIME-TA PSA G130M 1096 SEGMENT=B, BUFFER-TIME=312, 1 1350 S G FP-POS=4 (1350 S) Comments: From the ETC run, the Buffer time should be less than 2.35E6/4088. * (2/3.) < 383.2. For 1350s, the best buffer time is (1350-100)/4 = 312 s ------------------------------------------------------------------------------------------------------------------------------------ 8 WAVE COS/FUV TIME-TA WCA G130M 1096 FP-POS=4, SEGMENT=BOTH 1 DEF (0 S) G ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ G191B2B 1 COS/NUV ACQ/IMA BOA MIRRORB none none none none 1 N/A GE G191B2B 2 COS/FUV TIME-TA PSA G130M 1096 none none none none 1 N/A G G191B2B 3 COS/FUV TIME-TA PSA G130M 1096 none none none none 1 N/A G WAVE 4 COS/FUV TIME-TA WCA G130M 1096 none none none none 1 N/A G G191B2B 5 COS/FUV TIME-TA PSA G130M 1096 none none none none 2 N/A G G191B2B 6 COS/FUV TIME-TA PSA G130M 1096 none none none none 2 N/A G G191B2B 7 COS/FUV TIME-TA PSA G130M 1096 none none none none 2 N/A G WAVE 8 COS/FUV TIME-TA WCA G130M 1096 none none none none 2 N/A G 14179( 3) - 04-Dec-2015 20:29:59 - [ 5] Summary Form for Proposal 14179 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures BOA, PSA, WCA ------------------------------------------------------------------------------------------------------------------------------------ Configurations COS/FUV, COS/NUV ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ/IMAGE, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=275, BUFFER-TIME=312, FP-POS=1, FP-POS=2, FP-POS=3, FP-POS=4, SEGMENT=B, SEGMENT=BOTH ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G130M, MIRRORB ------------------------------------------------------------------------------------------------------------------------------------ Target Names G191B2B, WAVE ------------------------------------------------------------------------------------------------------------------------------------