12947( 3) - 12-Jul-2012 15:51:08 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 12947 Version: 3 Check-in Time: 12-Jul-2012 15:51:08 STScI Edit Number: 1 Title determination of the line-spread function of the E140H grating with the 0.2 x 0.5 slit ------------------------------------------------------------------------------------ Type Cycle GO 20 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Frederic E. Vincent University of California - Davis Y CoI: Dr. Lotfi Ben Jaffel CNRS, Institut d'Astrophysique de Paris N CoI: Dr. Walter M. Harris University of California - Davis N CoI: Prof. John T. Clarke Boston University N CoI: Dr. Eric Quemerais LATMOS N ------------------------------------------------------------------------------------ Abstract We propose to take an E140H observation of the 0.2" x 0.5" slit illuminated by one calibration lamp, in order to determine the line-spread function (LSF). Almost 50 archival observations will benefit from this LSF, so there will be a immediate return for the scientific community. There will be a direct application for Lyα observations of the interplanetary hydrogen. Moreover any future observation will also benefit of this lamp observation. ------------------------------------------------------------------------------------ Observations Description ------------------------ We will take an E140H observation of the 0.2" x 0.5" slit with HITM2, one of the three hollow cathode Pt/Cr-Ne arc lamps. This lamp exposure will provide a thinner emission line and a better estimate of the LSF for archival or future STIS observations. A previous lamp exposure with HITM2 (OBL601010) used the E140H grating with the 0.2" x 0.09" slit, yielding a maximal count rate lower than 0.07 counts/sec/pixel. With the 0.2" x 0.5", the maximal count rate should be lowert than 0.42 counts/sec/pixel, so well below the bright object limit for the FUV-MAMA (75 counts/sec/pixel). The exposure will be as long as possible. The full orbit, if possible. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 12947( 3) - 12-Jul-2012 15:51:08 - [ 2] Visit: 01 Visit Requirements: On Hold Comments: Additional Comments: The lamp will be HITM2 Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NONE STIS/FUV TIME-TA 0.2X0.2 E140H 1234 BUFFER-TIME=2500, LAMP=LINE 1 5137 S QESIPARM TARGTYPE HITM2; -MAMA G QELOGSHEET AP_1 S200X500 Comments: For the previous exposure with the HITM2 lamp and the 0.2" x 0.09" slit (OBL601010), the global count rate was about 41 counts/sec. So with the 0.2" x 0.5", the global count rate should be about 250 counts/sec. According to the criteria in the instrument handbook (page 235), the buffer time can be taken as half of the exposure time, so we are taking 2500 sec. ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ NONE 1 STIS/FUV TIME-TA 0.2X0.2 E140H 1234 none none none none 1 N/A -MAMA G 12947( 3) - 12-Jul-2012 15:51:08 - [ 3] Summary Form for Proposal 12947 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures 0.2X0.2 ------------------------------------------------------------------------------------------------------------------------------------ Configurations STIS/FUV-MAMA ------------------------------------------------------------------------------------------------------------------------------------ Opmodes TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=2500 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements QELOGSHEET AP_1 S200X500, QESIPARM TARGTYPE HITM2 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements E140H ------------------------------------------------------------------------------------------------------------------------------------ Target Names NONE ------------------------------------------------------------------------------------------------------------------------------------