9351( 10) - 04/10/03 09:45 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 9351 Version: 10 Check-in Date: 10-Apr-2003 09:44:18 1.Proposal Title: Determining Hubble's Constant from Observations of Cepheids in the Host Galaxy of SN Ia 1994ae ------------------------------------------------------------------------------------ 2. Proposal For 3. Cycle GO 11 ------------------------------------------------------------------------------------ 4. Investigators Contact? PI: Adam Riess Space Telescope Science Institute CoI: Dr. Peter B. Stetson National Research Council N CoI: Prof. Alex Filippenko University of California, Berkeley N ------------------------------------------------------------------------------------ 5. Abstract We propose to determine the luminosity of the type Ia supernova (SN Ia) 1994ae by observing Cepheids in the host spiral galaxy NGC 3370. Modern CCD photometry has yielded an extremely tight Hubble diagram for SNe Ia with a precisely determined intercept (i.e., Delta H_0/H_0) 1 measurement of the true Hubble constant is still limited by the calibration. The HST calibration of all but a few SNe Ia observed to date is significantly compromised by the systematics of photographic photometry and host galaxy extinction, as well as by the photometric uncertainties associated with WFPC2. In contrast, SN 1994ae is one of the very best-observed SNe Ia with CCD photometry. The exquisite B, V, R, and I light curves are well-sampled beginning 10 days before maximum brightness, and they indicate little reddening. From our supernova photometry and the current provisional SN Ia calibration we would find a distance of 30 +/- 2.1 Mpc, well within the range where ACS can accurately observe Cepheid light curves and distinguish Cepheids from nonvariable stars. ------------------------------------------------------------------------------------ 9351( 10) - 04/10/03 09:45 - [ 2] Observations Description ------------------------ The primary goal of the proposed observations is to detect Cepheid variables in the host galaxy of SN 1994ae (NGC 3370), and to determine their periods and mean magnitudes to estimate their distance. There are 12 visits. The first visit should be between Nov 01, 2002 and Nov 15, 2002 then each visit should be followed by this sequence in DAYS: 0, 11, 17.6, 22.0, 26.1, 28.8, 30.8, 33.1, 40.4, 45.2, 52.5 I put +/- 1 day on each visit, but STScI should SCHEDULE these as near the MIDDLE of the visit window as possible. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 9351( 10) - 04/10/03 09:45 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 100 NGC3370 GALAXY, SPIRAL RA=10H 47M 7.8S +/- 01S, DEC=17D J2000 V = 20.0 16' 35.3" +/- 2" B = 20.0 Coordinate Source: GSC_SURVEY_PLATE Comments: right now this has a bogus plate-id 9351( 10) - 04/10/03 09:45 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 18 Primary_Pattern Secondary_Pattern Pattern_Type LINE LINE Pattern_Purpose DITHER DITHER Number_Of_Points 2 2 Point_Spacing 2.989 0.1288 Coordinate_Frame POS-TARG POS-TARG Pattern_Orient 88.574 39.629 Center_Pattern NO NO ------------------------------------------------------------------------------------------------------------------------------------ 9351( 10) - 04/10/03 09:45 - [ 5] Visit: 11 Visit Priority: Visit Requirements: ORIENT 109D to 109D On Hold Comments: Additional Comments: visit 1 of 12 Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 10 NGC3370 ACS/WF ACCUM WFC F555W CR-SPLIT=NO 1 1200 S PATTERN 18 10 C ------------------------------------------------------------------------------------------------------------------------------------ 20 NGC3370 ACS/WF ACCUM WFC F814W CR-SPLIT=NO 1 1200 S PATTERN 18 20 C ------------------------------------------------------------------------------------------------------------------------------------ 9351( 10) - 04/10/03 09:45 - [ 6] Visit: 12 Visit Priority: Visit Requirements: AFTER 11 BY 8 D TO 10 D SAME ORIENT AS 11 On Hold Comments: Additional Comments: visit 2 of 12, please try to schedule in middle of this AFTER window Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 10 NGC3370 ACS/WF ACCUM WFC F555W CR-SPLIT=NO 1 1200 S PATTERN 18 10 C ------------------------------------------------------------------------------------------------------------------------------------ 9351( 10) - 04/10/03 09:45 - [ 7] Visit: 13 Visit Priority: Visit Requirements: AFTER 11 BY 15.0 D TO 17.0 D SAME ORIENT AS 11 On Hold Comments: Additional Comments: visit 3 of 12, please try to schedule in middle of this AFTER window Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 10 NGC3370 ACS/WF ACCUM WFC F555W CR-SPLIT=NO 1 1200 S PATTERN 18 10 C ------------------------------------------------------------------------------------------------------------------------------------ 20 NGC3370 ACS/WF ACCUM WFC F814W CR-SPLIT=NO 1 1200 S PATTERN 18 20 C ------------------------------------------------------------------------------------------------------------------------------------ 9351( 10) - 04/10/03 09:45 - [ 8] Visit: 14 Visit Priority: Visit Requirements: AFTER 11 BY 21.0 D TO 23.0 D SAME ORIENT AS 11 On Hold Comments: Additional Comments: visit 4 of 12, please try to schedule in middle of this AFTER window Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 10 NGC3370 ACS/WF ACCUM WFC F555W CR-SPLIT=NO 1 1200 S PATTERN 18 10 C ------------------------------------------------------------------------------------------------------------------------------------ 9351( 10) - 04/10/03 09:45 - [ 9] Visit: 15 Visit Priority: Visit Requirements: AFTER 11 BY 25.1 D TO 27.1 D SAME ORIENT AS 11 On Hold Comments: Additional Comments: visit 5 of 12, please try to schedule in middle of this AFTER window Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 10 NGC3370 ACS/WF ACCUM WFC F555W CR-SPLIT=NO 1 1200 S PATTERN 18 10 C ------------------------------------------------------------------------------------------------------------------------------------ 9351( 10) - 04/10/03 09:45 - [ 10] Visit: 16 Visit Priority: Visit Requirements: AFTER 11 BY 27.8 D TO 29.8 D SAME ORIENT AS 11 On Hold Comments: Additional Comments: visit 6 of 12, please try to schedule in middle of this AFTER window Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 10 NGC3370 ACS/WF ACCUM WFC F555W CR-SPLIT=NO 1 1200 S PATTERN 18 10 C ------------------------------------------------------------------------------------------------------------------------------------ 9351( 10) - 04/10/03 09:45 - [ 11] Visit: 17 Visit Priority: Visit Requirements: AFTER 11 BY 29.8 D TO 30.8 D SAME ORIENT AS 11 On Hold Comments: Additional Comments: visit 7 of 12, please try to schedule in middle of this AFTER window Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 10 NGC3370 ACS/WF ACCUM WFC F555W CR-SPLIT=NO 1 1200 S PATTERN 18 10 C ------------------------------------------------------------------------------------------------------------------------------------ 20 NGC3370 ACS/WF ACCUM WFC F814W CR-SPLIT=NO 1 1200 S PATTERN 18 20 C ------------------------------------------------------------------------------------------------------------------------------------ 9351( 10) - 04/10/03 09:45 - [ 12] Visit: 18 Visit Priority: Visit Requirements: AFTER 11 BY 32.1 D TO 34.1 D SAME ORIENT AS 11 On Hold Comments: Additional Comments: visit 8 of 12, please try to schedule in middle of this AFTER window Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 10 NGC3370 ACS/WF ACCUM WFC F555W CR-SPLIT=NO 1 1200 S PATTERN 18 10 C ------------------------------------------------------------------------------------------------------------------------------------ 9351( 10) - 04/10/03 09:45 - [ 13] Visit: 19 Visit Priority: Visit Requirements: AFTER 11 BY 35.2 D TO 37.2 D SAME ORIENT AS 11 On Hold Comments: Additional Comments: visit 9 of 12, please try to schedule in middle of this AFTER window Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 10 NGC3370 ACS/WF ACCUM WFC F555W CR-SPLIT=NO 1 1200 S PATTERN 18 10 C ------------------------------------------------------------------------------------------------------------------------------------ 9351( 10) - 04/10/03 09:45 - [ 14] Visit: 1A Visit Priority: Visit Requirements: AFTER 11 BY 38.9 D TO 41.7 D SAME ORIENT AS 11 On Hold Comments: Additional Comments: visit 10 of 12, please try to schedule in middle of this AFTER window. (PC added 2nd afterby in an attempt to make visit schedulable, 10-apr-2003) Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 10 NGC3370 ACS/WF ACCUM WFC F555W CR-SPLIT=NO 1 1200 S PATTERN 18 10 C ------------------------------------------------------------------------------------------------------------------------------------ 20 NGC3370 ACS/WF ACCUM WFC F814W CR-SPLIT=NO 1 1200 S PATTERN 18 20 C ------------------------------------------------------------------------------------------------------------------------------------ 9351( 10) - 04/10/03 09:45 - [ 15] Visit: 1B Visit Priority: Visit Requirements: AFTER 11 BY 44.2 D TO 46.2 D SAME ORIENT AS 11 On Hold Comments: Additional Comments: visit 11 of 12, please try to schedule in middle of this AFTER window Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 10 NGC3370 ACS/WF ACCUM WFC F555W CR-SPLIT=NO 1 1200 S PATTERN 18 10 C ------------------------------------------------------------------------------------------------------------------------------------ 9351( 10) - 04/10/03 09:45 - [ 16] Visit: 1C Visit Priority: Visit Requirements: AFTER 11 BY 51.5 D TO 53.5 D SAME ORIENT AS 11 On Hold Comments: Additional Comments: visit 12 of 12, please try to schedule in middle of this AFTER window Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 10 NGC3370 ACS/WF ACCUM WFC F555W CR-SPLIT=NO 1 1200 S PATTERN 18 10 C ------------------------------------------------------------------------------------------------------------------------------------ 20 NGC3370 ACS/WF ACCUM WFC F814W CR-SPLIT=NO 1 1200 S PATTERN 18 20 C ------------------------------------------------------------------------------------------------------------------------------------ 9351( 10) - 04/10/03 09:45 - [ 17] Summary Form for Proposal 9351 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WFC ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 109D to 109D PATTERN 18 10 PATTERN 18 20 AFTER 11 BY 8 D TO 10 D SAME ORIENT AS 11 AFTER 11 BY 15.0 D TO 17.0 D SAME ORIENT AS 11 AFTER 11 BY 21.0 D TO 23.0 D SAME ORIENT AS 11 AFTER 11 BY 25.1 D TO 27.1 D SAME ORIENT AS 11 AFTER 11 BY 27.8 D TO 29.8 D SAME ORIENT AS 11 AFTER 11 BY 29.8 D TO 30.8 D SAME ORIENT AS 11 AFTER 11 BY 32.1 D TO 34.1 D SAME ORIENT AS 11 AFTER 11 BY 35.2 D TO 37.2 D SAME ORIENT AS 11 AFTER 11 BY 38.9 D TO 41.7 D SAME ORIENT AS 11 AFTER 11 BY 44.2 D TO 46.2 D SAME ORIENT AS 11 AFTER 11 BY 51.5 D TO 53.5 D SAME ORIENT AS 11 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F555W F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC3370 ------------------------------------------------------------------------------------------------------------------------------------