15401( 3) - 23-Oct-2017 18:41:26 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 15401 Version: 3 Check-in Time: 23-Oct-2017 18:41:26 STScI Edit Number: 0 Title ACS/WFC Grism ------------------------------------------------------------------------------------ Type Cycle CAL/ACS 25 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Nimish P. Hathi Space Telescope Science Institute Y CoI: Dr. Norbert Pirzkal Space Telescope Science Institute N CoI: Dr. Norman Grogin Space Telescope Science Institute N CoI: Dr. Marco Chiaberge Space Telescope Science Institute - ESA N ------------------------------------------------------------------------------------ Abstract The goal of this proposal is to observe an emission line star (WR96) with the ACS/WFC G800L grism to provide a check on trace and wavelength calibrations as a function of spatial position on the ACS detector. ------------------------------------------------------------------------------------ Observations Description ------------------------ The goal of this proposal is to observe an emission line star (WR96) with the ACS/WFC G800L grism to provide a check on trace and wavelength calibrations as a function of spatial position on the ACS detector. WR96 is a Wolf-Rayet star, which is a bright (V~14 mag) point source with strong emission lines. These features make this star an ideal candidate for wavelength calibration of ACS grism. We will observe WR96 for 20 secs (G800L) and 1 sec (F775W) at 3 different positions on the ACS detector (2 chip centers and 1 additional position on chip1). In addition to F775W direct imaging, we will also use F625W (1sec) at one position to check the image position stability against the selected filters. The WFC1 aperture at the center of chip1 will allow us to compare these new observations with the existing observations of the same star at the same position. The full detector readout for two apertures (WFC1 and WFC2) at chip centers will allow us to observe other stars/compact objects in the ACS field of view, which will be important to perform a check on trace calibration. ------------------------------------------------------------------------------------ 15401( 3) - 23-Oct-2017 18:41:26 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 4 WRAY-15-1736 CALIBRATION, WAVELENGTH RA=17H36M24.4530S, J2000 V = 14.14 DEC=-32D54'31.45" Reference Frame: Other: SIMBAD Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 15401( 3) - 23-Oct-2017 18:41:26 - [ 3] Visit: 01 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 WRAY-15-173 ACS/WFC ACCUM WFC1A-2K F775W 1 1 S (1 S) 6 ------------------------------------------------------------------------------------------------------------------------------------ 2 WRAY-15-173 ACS/WFC ACCUM WFC1A-2K G800L AUTOIMAGE=NO 1 20 S (20 6 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 WRAY-15-173 ACS/WFC ACCUM WFC1A-2K F625W 1 1 S (1 S) 6 ------------------------------------------------------------------------------------------------------------------------------------ 4 WRAY-15-173 ACS/WFC ACCUM WFC1 F775W 1 1 S (1 S) 6 ------------------------------------------------------------------------------------------------------------------------------------ 5 WRAY-15-173 ACS/WFC ACCUM WFC1 G800L AUTOIMAGE=NO 1 20 S (20 6 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 WRAY-15-173 ACS/WFC ACCUM WFC2 F775W 1 1 S (1 S) 6 ------------------------------------------------------------------------------------------------------------------------------------ 7 WRAY-15-173 ACS/WFC ACCUM WFC2 G800L AUTOIMAGE=NO 1 20 S (20 6 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 | ------------------------------------------------------------------------------------------------------------------------------------ WRAY-15-1736 1 ACS/WFC ACCUM WFC1A-2K F775W none none none none 1 N/A WRAY-15-1736 2 ACS/WFC ACCUM WFC1A-2K G800L none none none none 1 N/A WRAY-15-1736 3 ACS/WFC ACCUM WFC1A-2K F625W none none none none 1 N/A WRAY-15-1736 4 ACS/WFC ACCUM WFC1 F775W none none none none 1 N/A WRAY-15-1736 5 ACS/WFC ACCUM WFC1 G800L none none none none 1 N/A WRAY-15-1736 6 ACS/WFC ACCUM WFC2 F775W none none none none 1 N/A WRAY-15-1736 7 ACS/WFC ACCUM WFC2 G800L none none none none 1 N/A 15401( 3) - 23-Oct-2017 18:41:26 - [ 4] Summary Form for Proposal 15401 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WFC1, WFC1A-2K, WFC2 ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters AUTOIMAGE=NO ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F625W, F775W, G800L ------------------------------------------------------------------------------------------------------------------------------------ Target Names WRAY-15-1736 ------------------------------------------------------------------------------------------------------------------------------------